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UM-0046-A0 - DT500 Concise Users Manual

1. N C rates i e gt 30 minutes See Battery Life on page 15 nc N C oF i GY Gel Cell oF 1 Alkaline 1 Alkaline 9V Alkaline m m ro 6V N C O9 Bat MLO fal 2 Bat fl 2 Bat N C 2 N C acre Bat 71 E 3 Lead E j3 Lead Ground External DC Power External AC Power External Battery Internal Gel Cell Battery Internal Alkaline Battery Se eee Headphone Socket BEH ES Digital Counters Analog Channels Geologger versions Di itch Rs232comms 3 a g O 3 a Ra ee l Ip switc Port Isolated cpOcrOcP 543275321 kR 8AR 8R E Shown set to the A Ett Ptr ttt factory setting aiaoleiolelolelolaleioleloleloleloloioloieialelole 0 gt 1 lo on default 3 off n Jon Country Channel Expansion 4 loff f o US 60Hz on Connector Internal Batte 5 Jott f Jon other 50Hz off a Cohet 6 loff n o mm Height without memory card 85mm 7 off n jon with memory card 105mm 8 Joff f o Baud Rate s2 s3 s4 Add Range 9 Joff f jon j 1200 off off x 0 31 754 10 Joff n joff default 9600 off on off 0 15 pm 11 Jott n fon 300 ottlonjon 0 15 OE 12 fofi Jo 2400 Jon oti x 0 31 l SsSSSSSSSSSSSSSSSSSSSSSSSS 13 off f jon 4800 jonjon x 0 31 a S O E S S D E E S E E E A S E D E E A 1 G n fo Ydont care R e R R RE4 R R ie E 3 T oF Memory Card Socket ETE gt gt sae Ea 5 O i Display 17 Jon off offoff Jon Country Setting jy Se Convert tavol a e
2. lt lt gt gt AND OR XOR and NOT The underlined operators have equal precedence Expressions evaluate left to right however parentheses can be used to define a particular order of evaluation Parentheses can be nested The total number of expressions in a program is limited to 100 and collectively are limited to 3848 characters Expressions are evaluated at the report time of the embracing schedule and in the order in which they occur within the schedule Conditional Calculations Boolean logic within expressions can be used to return a result which is dependent on a condition being true or false as follows 2CV 1CV 2 1CV lt 1000 1CV 4 1CV gt 1000 which returns a value of 2 1CV if 1CV is less than 1000 ora value of 4 1CV if 1CV is greater than or equal to 1000 Combining Methods The different scaling and calculation methods can be used together Comprehensive examples are the best way to demonstrate In the following program a vector average is calculated The inputs are wind speed and direction Wind speed calibration 0 50 m s 0 1000mV S1 0 50 0 1000 m s Wind direction 0 2z radians 0 360 deg 0 1000mV S2 0 6 2832 0 1000 radians Y3 0 1 m s Units text for wind speed report Y4 0 1 Deg Units text for wind direction report BEGIN RA5S Schedule to scan every 5 seconds 1V S1 1CV W Sample wind speed 2V S2 2CV W Sample wind directi
3. Examples 1V 5F The optional Shield is necessary when the signal source has a high output impedance or when noise pick up from other especially power cables is a problem A Guard not shown connected to the excite terminal can help reduce the effects of cable leakage and capacitance see Glossary on page 23 Differential Input Config 2 Examples 14 V 3 AS 1 34 TK The excite terminal cannot be used as a single ended input on the DT50 Single Ended Inputs Config 3 Examples 1 V X 2 5 F X A R A 5 LM35 X se SE Ref The excite terminal cannot be used as a single ended input on the DT50 Single Ended Inputs with External Reference Config 4 Examples 1V 10 3TJ 2 5 V 100 Attenuated voltage inputs let you measure large voltages extend the common mode range and provides greater input protection Differential or single ended measurement is possible For sensors with built in amplification the attenuation factor can be less than unity or negative for a sign reversal Attenuated Input Config 5 Examples 14 V 11 X 3 TJ X 2 5 V X 100 I se Ref Tk line common to other channels attenuation R1 R2 R2 Ground This configuration is useful for high voltage differential input and situations where high accidental voltages are likely For maximum common mode rejection match the attenuator
4. Differential vibrating wire with two wire RTD It is possible to use the copper coil in the vibrating wire gauge as a temperature sensor provided a three wire connection is used Channel Terminals 1FW 1CU 135 Differential vibrating wire with three wire copper RTD The gauge is read as 1FW and the temperature as 1CU 135 where the 135 channel factor is the coils resistance at 0 Appendix Channel Expansion Module Introduction The Channel Expansion Module provides increased channel capacity for Datatakers fitted with an expansion connector The channel measurement specifications of the Datataker also apply to the Channel Expansion Module This particularly applies to the analog input voltage ranges While the expansion module has a relay multiplexer capable of withstanding voltages in excess of 500 volts if for example it is connected to a Datataker 500 and 600 the maximum allowable input voltage remains 4 volts Analog Inputs 10 differential or 30 single ended or any mix Channel characteristics identical to Datataker to which the module is attached Channels have 500 volt isolation while not being read Input impedance 1MQ or gt 100 MQ selectable Sensor excitation of 4 5V 250 0uA 2 500mA or externally supplied source to each channel Full half and quarter bridges voltage or current excitation Multiplexer type relay Digital Inputs and Outputs 20 TTL CMOS Voltage free contac
5. Datataker Manual AConaise Reference for Datataker Mbdels DI50 DI500 DIGOO DI505 DI6GO5 DI515 DI615 and the Channel Expansion Mbdule Series 2 EUROPE C This product complies with the requirements of European Directives 89 336 EEC and 73 23 EEC and conforms with EN55022 Class A emissions and EN50082 1 susceptibility Mains adaptors used to power this product must comply with EN60950 EN60742 or EN61010 AUSTRALIA amp NEW ZEALAND This product complies with the requirements of Australian and New Zealand standard for EMC emissions AS NZS 3548 1992 acn Class A 006 134 863 rUSA This device complies with Part 15 of the FCC rules Operation is subject to the following two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation rCANADA This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus as set out in the Radio Interference Regulations of the Canadian Department of Communications Le pr sent appareil num rique n met pas de bruits radio lectriques d passant les limites applicables aux appreils num riques de la Classe A prescrites dans les r glements sur le brouillage radio lectrique dict s par le Minist re des Communications du Canada CAUTION USE APPROVED ANTI STATIC PROCEDURES The
6. Q R LOGON command 8 S low power operation 15 Macintosh connection 13 mathematical functions 7 memory card 8 12 29 messages to COMS ports 14 modem connection 13 multiple reports 3 4 12 multiplexer power 15 24 25 networking 14 NOCOPY command 8 noise minimisation 17 extra samples ESn 5 averaging 6 order of scanning 3 Unloading 8 sampling 3 schedules 3 output format 10 units 4 6 parameters Pn 11 parity 13 PASSWORD protection 13 phase encoder 4 20 23 polled schedule RX 3 polling alarm data ALL n 9 T polynomials 7 power external connection 1 15 24 25 26 consumption 15 26 printer on COMS port 14 program branching 18 program in EPROM 18 programming from cards 8 protect program F 11 pulse output nDSO f f R 1 4 U pulse generator nHSCO 0 18 Q quit Unload 8 V radians 7 RAM card 8 12 rate of change 5 reference junction 5 16 28 W relational operators 7 RESET command 10 resetting counters R 4 5 18 resistance measurement 4 16 19 resolution 4 17 23 retrieval of data 8 RS232 RS423 13 RTD s 4 19 28 X Page 36 sampling order 3 time P11 8SV 6 11 scan interval 3 order 3 trigger 3 schedules 3 scrolling display 12 self heating of sensors 17 sensor wiring 4 19 20 settling time P10 7SV 6 11 shunts current 4 17 19 sign on message 12 SIGNOFF command 13 single ended input 4 19 22 reference input 4 19 22 span scali
7. 5 6 8Vdc Lead Bat The external 6 Volt gel cell connection provides temperature compensated charging with voltage 6 90V and current 1A limiting for a three cell battery when an external AC or DC power supply is also connected When the Datataker 50 is powered by a 9V alkaline battery and an external AC or DC source the 6 9V regulator s see schematic output is increased to 10V so that power is drawn from the external source in preference to the battery COMMS Pott aso page 13 The Datataker 50 s COMMS Port is serial RS232 compatible The output signal level is approximately RS232 COMMS Dip Switch Shown set to the factory setting Other 50Hz Page 24 Country Setting The Country Setting determines the default integration period 16 7mS for US and 20mS for others for the analog to digital converter and the default date format see Time and Other Channels on page 6 Baud Rate US 60Hz Caution To avoid damage use 6 Volt lead acid battery only ensure correct polarity before connecting the battery 6 9V Switch Mode Regulator 9 2mV T External Battery Connections Alkaline Gnd T F Simplified Power Supply Schematic 6 9V Gnd Wiring Power 11 24 Vdc External DC Power 4 Volts allowing communications over distances in
8. Four standard enclosures are available for housing Datataker data loggers and or Channel Expansion Modules The enclosures are suitable for industrial weatherproof and portable applications Industrial Enclosures e The industrial enclosures are constructed of powder coated sheet steel have a polyurethane door seal and are rated to IP 65 or NEMA 5 The capacity of each enclosure is SIE 1 Datataker or 1 CEM LIE 1 Datataker plus 1 CEM or two Datatakers SIC 1 Datataker plus 2 CEMs or three Datatakers Each enclosure also houses a 4Ah gel cell or 17Ah alkaline battery e Panel Mount Display modules can be factory installed into the door of any enclosure by special order e Cable entry is completed by the user by drilling holes and fitting cable glands Three sizes of industrial enclosures are available Dimensions mm Height Width Depth Weight Small Indust Enclosure SIE 400 200 120 4 5kg Large Indust Enclosure LIE 300 380 155 7 0kg Small Indust Cabinet SIC 600 380 210 15 0kg Portable Enclosure Allows Datataker to be used in a portable mode and protects the logger from water dust and mechanical damage Rated to IP 67 or NEMA 6 and can be submersed for short periods e Clamshell design constructed of black ABS plastic with stainless steel hinge The lid has a neoprene seal and can be padlocked e Withstands 800kg stacking loads and does not dent or warp e Houses one Datataker and a 4Ah gel cell or 17
9. Note If a program in a write protected PC Card memory card includes a RESET command then the Datataker will suspend operation until the card is removed or the write protect switch is moved to the disabled position Memory Cards and Programs added convenience When the commands are copied into the program area of the memory card these are appended to the current contents of the program area If there was a previously stored program on the memory card then the new program is appended to the old program The old program must first be cleared by a CPROG command if not required The STATUS command returns the used and available space in the program area of the memory card and STATUS8 also shows the full program listing NOTE The syntax of the card program is not checked until the program is actually run Check the program by executing the RUNPROG command while the card is inserted or by removing and re inserting the card Inserting a card causes immediate program execution if Q is set to the default in the Datataker see below When is a Card Program Run When you insert a memory card into the Datataker any program on the card is normally loaded into the logger compiled and run immediately Datatakers with a display will show the message Prog You can stop automatic loading of card programs by setting the Q switch to q The program on an inserted memory card can be loaded and run by the RUNPROG command This executes
10. STATUSS8 returns the memory card program 4015 75 Program Characters Free Stored Y 1 0 0382 14 4 kPa RA15S T 1V Y 1 1CV ALARM1 1CV gt 150 2DSO Boiler STATUSS9 returns the Datataker s current switch settings a C d E h T K 1 M N 0 Q R S t U v w x y Z STATUS10 returns further information about the current program in the logger 27113 1989 1 0 lt A 2S H lt Dry bulb 0 0 5 4 3 gt lt Wet bulb 0 0 5 4 3 gt lt Humidity SRH 0 0 5 4 3 gt gt lt B gt lt C gt lt D gt lt X gt This report is a list of comma separated items providing details about the Datatakers program In order they are Program ID Base year Time resolution Card status Current string followed by Schedule fields that identify individual channels their format and their units If there is no program the following is returned 0 0 0 0 lt A gt lt B gt lt C gt lt D gt lt X gt Refer to the Datataker Advanced Communications Manual for detailed description STATUS11 returns information about the program on an inserted memory card The format is the same as for STATUS10 Refer to the Datataker Advanced Communications Manual for a detailed description STATUS12 returns the time and date of the first and last data points stored in the Datataker s internal memory 00 11 33 on 05 11 1992 00 13 00 on 19 01 1993 Internal data Start End times STATUS13 returns the time and date of the first and last data points
11. With internal sensor power as illustrated the upper response is limited to approx 70 External power should be current limited Be aware of self heating effects a 500A sensor current can cause 1 5 error A fourth wire to the sensor s negative pin in place of the link will improve accuracy Single ended input as in Config s 2 amp 3 LM335 Temperature Input Examples 5LM35 5 LM35 of TO92 case This configuration limits the sensor s lower range to approx 10 and 10 for the LM34 and LM35 respectively due to the lack of a pull down capacity Accuracy is improved if the link is replaced by a fourth wire to the sensor s negative pin Without the link the sensor is read as a single ended input as in Config s 2 amp 3 Sensor power may be externally derived eg 5V to free the Excite terminal LM34 amp LM35 Temperature Input Examples This arrangement allows full range measurement Multiple single ended sensor connection Config 3 is possible by connecting the LM35 negative pins to SE ref The diodes can be shared Sensor power can also be derived from external sources This resistor may be needed to prevent sensor oscillation with long leads See manufacturer s data National Semiconductor Corp for more details LM34 amp LM35 Temperature Input Digital Configurations Config 22 Examples Digital 1 4DS o4 inputs 3C R 1PE Ground The digital and counter inp
12. transition of a digital input n E trigger on transition of a digital input nC c trigger after c counts on a low speed counter nHSC trigger after ANY counts on a high speed counter where n is a digital channel number can also be a channel sequence n m For example RA1 E will scan every 0 to 1 transition of digital input 1 and RA2 3 E will scan every 1 to 0 transition of digital input channels two OR three These transitions could be generated by an ALARM see Action Commands on page 9 Note If a counter input is preset outside of the trigger range eg 2C 10 15 then a trigger will not occur AND OPTIONALLY Trigger While condition is true A schedule s trigger can be enabled or disabled by the state of one or more digital input channels nDS by appending a While to either a Time Interval or an Event nW enable while digital input nis high n mW enable if ANY digital input n to m is high Note that the colon is required An example of a conditional event triggered schedule is RA1E 2W which will scan on every transition of digital input one 1DS while digital input two 2DS is high NOTE Digital inputs are not read while the logger is asleep and so nE nC and nW triggers will not be detected High speed counter triggers nHSC will be detected on next wake Schedule A RA10M 1 5V RB1H 2W 1 4DS 6 9PT385 AV MX 2C R aa Channel Lists Any set of channels see page 4 separated by at least one space ch
13. 0 46 1 6 pS TIME 24 hrs 1 sec 0 03 sec per day 6 3 sec per day 0 78 sec per month 3 16 min per month USING THE ACCURACY TABLE ABOVE TEMPERATURE LM35 i C 0 013 C 0 00 15 C 2 00 15 C Example 1 Calculate the resolution when measuring a frequency of 25kHz THERMOCOUPLES Reference Un Trimmed From the Frequency Range 30kHz row above 25mV range C 0 04 C 0 06 42 7 C 0 16 42 7 C Resolution 0 0022 of Full Scale 250mV range C 0 43 C 0 06 4 6 C 0 17 4 6 C 0 022 of 30kHz THERMOCOUPLES Reference Trimmed 0 66Hz minimum ADC step 25mV range C 0 04 C 0 06 1 2 C 0 16 41 2 C A amp 250mV range C 043 C 40 06 431 C 10 17 431 C Example 2 Calculate the tolerance in measuring a frequency of 25kHz at 25 C RTDs 3 Wire From the Frequency Range 30kHz row above Pi100 1009 lt 51 C 0 01 C 40 10 0 17 C 40 17 0 17 Tolerance in the reading at 25 C of Full Scale Offset Pt100 5002 51 600 C 0 13 C 40 15 40 82 C 0 24 0 82 C 0 052 of 30kHz 0 65Hz Ni1000 7K C 0 10 0 20 0 57 C 0 31 0 57 C 15 6Hz 0 65Hz Cu135 5009 C 0 14 C 0 15 0 84 C 0 24 0 84 C 16 3Hz That is the reading is 25 000Hz 16 3Hz at 25 C A DT505 605 515 and 615 only Thermocouple accuracy figure varies slightly with thermocouple type and applies as percentage of Celsius scale Index where to find it ASCII characters 13 23 action commands
14. 40mS for each analog channel 10mS for each digital channel and 10 to 50mS for each calculation Also the Datataker must wake at least once every 18 minutes for time keeping and will not sleep unless it can sleep for at least Battery Sizes one full second Current draw is 120mA while awake and 0 4mA while asleep Solar Charging Sealed gel cell batteries may be charged via a 12V solar panel The Datataker provides current and voltage limiting to protect both the panel and battery provided that the panel is connected to the AC DC Power input Do not attempt to charge alkaline battery packs The size of the solar panel required depends on the hours of full sunlight that can be expected As a general rule only one day in seven should be regarded as a charge day and the charge must be able to fully replenish the batteries on that day The solar panel rating is calculated as follows Panel Rating a Amps in full sunlight xn where Iw is the amp hours per week consumed by the logger Tw_ is the hours per week of full sunlight N __ is the efficiency a combination of battery charge absorption and the cosine effect Typical 0 65 Setting P15 1 ensures that the Datataker sleeps whenever possible to conserve power Sensors 1 understanding helps Thermocouples Introduction A thermocouple is two wires of dissimilar metals that are electrically connected at one end the measurement junction and thermally connected at t
15. If a memory card containing data from the same program is inserted the Datataker will append any data in the internal memory to the memory card and then continue logging to the card If a memory card containing the data from a different program is inserted the Datataker will not transfer data from internal memory to the card but will continue logging to the internal memory If you issue a CDATA command to clear the memory card then data will be transfered after clearing Data Logging Commands Data logging is globally enabled by LOGON and is disabled by LOGOFF By default data logging is disabled How Data is Stored All data is logged as 24 bit 16 bit mantissa floating point numbers Internal calculations are 32 bit floating point Each schedule stores a three byte header per scan for identification scan time and scan date When logged data is unloaded this header and the original schedule are used to interpret the data Schedules cannot be replaced when data has been logged until data is cleared by CLEAR amp CDATA Stop When Full Mode o By default data logging stops when the memory is full the earliest data is retained and the most recent discarded If a memory card is used the internal memory is used only after the memory card is full Overwrite Mode O Alternatively the oldest data may be overwritten when the memory is full This is invoked by the O switch The internal memory is not used in overwrite m
16. Many different connections are possible i Datataker Channel excite input input return R Four input screw AT terminals for one of many analog input channels Ground shared Page 1 Channel Type see page 4 The input channels are very versatile however the Datataker is not smart enough to know what type of sensor is connected It must be told A channel is defined by a channel type that determines how the multiplexer is patched and how the readings are to be processed There are more than thirty different channel types The same channel may be read using different channel types For example a thermocouple may be read as a thermocouple or as a voltage The command 1TK 1V will return both a temperature and a voltage based on two readings of the same sensor RE excitation RE 2 50mA or 4V To 15 bit analog to digital converter Instrumentation amplifier gain x1 x10 or x100 Le Analog multiplexer and signal router showing connection for a differential input with sensor excitation solid lines and a single ended input broken lines A Standard Datataker Analog Input Channel Differential Input A differential input is one in which the signal is the voltage between two wires and neither wire is necessarily at ground potential On the Datataker the and terminals provide for differential input The multiplexer patches the channel s terminal to the amplifier s input and
17. The channel type is a Tt where t is the thermocouple type TB TC TT Using the thermocouple channel type reads the channel as a voltage and automatically applies cold junction compensation and linearisation Reference Junction Support The Datataker by default uses the internal temperature sensor channel 1 LM35 on the Datataker and n 1 LM35 on Expansion Modules as the reference junction sensor The internal sensor has an accuracy of 0 5T and may be trimmed by P2 in units of 0 001 However you can also use any channel as the reference junction temperature sensor channel This is done by including the TR option in the channel s option list The channel must return its value in the current temperature units The following are valid 4LM35 TR an external LM35 as a reference 3V 1 TR polynomial Y1 would convert to temp 11SV TR use when thermocouple is externally compensated Note 11SV 0 00 A second compensation facility lets you correct for voltage offset errors that may occur on all channels of an external isothermal block This is the TZ channel option The channel must return its value in the units of mV e g 1V TZ This arrangement of reference channels provides the flexibility to use multiple external isothermal blocks Each isothermal block can have its own set of reference channels The reference temperature and reference zero channel readings remain current until the reference channels are scanned again The
18. The physical a b and signal c d limits define any two points on the calibration line not necessarily the end points Note c and d default to 0 and 100 if not specified which is useful for 4 20mA current loop channels A single Span definition may be applied to any number of channels in any schedules or alarms The defined span is applied to a channel as a channel option For example S17 0 300 100 1000 KPa 1V S17 Boiler pressure returns Boiler pressure 239 12 KPa As a tule it is best to define Spans and Polynomials in a program before the schedules and alarms are entered Polynomials Yn Polynomials are used to define calibrations for non linear sensors using the formula 0 y Yi knx kg kyx kox kgx kax kgx n 5 where x is the channel reading and the k s are coefficient terms The polynomial is defined by the coefficient terms Y n k ky kok kg kg text where nis the polynomial number between 1 and 20 A total of 20 Spans and Polynomials can be defined Only the coefficient terms up to the required order need to be entered Simple scale and offset corrections are also possible internally the Datataker treats Spans as a first order polynomial The text replaces the channels default units text Polynomials are applied to channels as a channel option Y18 25 5 0 345 0 0452 Deg C 1V Y18 will return 1v 44 35 Deg C The coefficient terms of a polynomial are evaluated by a least squ
19. after it is read in a schedule For example 3HSC R will 123 4 5 6 7 8 9 10 11 12 13 14 cause high speed counter three to be set to zero after being te oe a eine iA hardware pulses A NANN MLL read A A ata N WOO Counters may be assigned a value or the result of an and will continue to function when the Datataker sleeps The mode 0 N expression high speed counters have dedicated input terminals mode 2 J a N 1 L l 1C 15 labelled C1 C2 and C3 and increment on a positive going de 3 DD we N n man 2HSC 10 1CV 100 SIN 2CV 3CV transition They can count at rates of up to about 500Hz MO00e The maximum count speed is limited by the 1mS debounce mode 4 T N Such assignment as with all assignments may be included circuit The high speed counter inputs have a 100KQ pull up The out of range temperatures will be logged at the alarm scan rate RZ1M whenever either temperature exceeds 100 Deg Placing Program in EPROM A Datataker program can be permanently loaded into the internal EPROM The logger will execute the program whenever it is powered up or RESET behaving as a dedicated instrument This is a process best undertaken by a technician with the equipment and experience in burning EPROM s An application note is available default 1HSCO 2 65535 in a schedule to be executed on each scan resistor to 5 volts command issued here e g 1HSCO mode N where N 4 Analog Input Configurations 1
20. are 1 5V module 1 analog channel 5 voltage 2 1 3DS module 2 digital channels 1 to 3 2 4DSO 1_ module 2 digital output channel 4 The module number is also attached to data returned by the Datataker The above channels will return data as 1 5V 23 452mv 2 1DS 1 State 2 2DS 0 State 2 3DS 1 State As with all data returned by the Datataker the channel identification can be switched off using the n switch Internal Channels Each Channel Expansion Module has two internal channels a temperature and an electrical zero channel e 1 LM35 expander temperature channel e 2 V electrical zero channel where e is the expander number and the percent symbol indicates an internal channel High Voltage Protection The Channel Expansion Module does not include built in energy absorbing lightning protection However with certain important conditions all analog channel terminals except for the return R terminals are capable of withstanding 1 5KV for 10S 500V for 50mS and 100V indefinitely The return terminal can withstand only 5 of these voltages The above withstanding voltages apply only to unselected channels While a channel is being read a process that typically takes 30mS these withstanding voltages are reduced to those of the Datataker For non isolated Datatakers this can be as low as 5 volts relative to ground In applications where scanning is infrequent say not more than every 3 hours the probability of a scan be
21. display identifies the alarm and the state of the alarm ON or OFF If the alarm channel definition includes identification text then this is displayed when the alarm is not true If the alarm contains action text this is displayed when the alarm is true The bottom line of the display shows the most recent reading as a numeric value or bar graph See the examples to the right Alarms are available for display by default but are not automatically displayed They can be enabled for display using the List and Light keys The A switch forces display of alarms if entered before the alarm commands The ND channel option can be used to make alarm channels unavailable for display Status Screens Channel Screens Alarm Screens Controlling The Screens On first power up or after a RESET the display shows the Sign On Screen There are two levels of display control First level the programmer uses W intermediate working channel option P19 status screen enable ND no display channel option These controls determine if a channel is available for display By default data channels and alarms Battery 90 123mA 6 8V 26 C Page 12 are available The screen is then displayed only if enabled at the second level Second level the operator using the keys List hold down for edit list mode Scroll select screen Light enable disable display item This process enables or disables avail
22. logger sleeps although rollovers are not detected 82C54 style counters The digital inputs are sampled every debounce period see P13 on page 11 which defaults to 50mS No sampling r occurs while the logger sleeps alas f Ground S E Output DSO and DBO and low speed Counter C and UDC Channels 2V threshold for input see page 4 Zener protection on outputs The low speed Counters are implemented in software Digital interface circuit Output driver 200mA at 30V max 1 0V saturation COMMS Port Interface COMS Port RS232 Interface 3 Tx 1 Interface Common ground Isolation COMMS Port Electrical isolation to 500V Glossary what it means Actuator a device which converts a voltage or current input into a mechanical output Analog to Digital Converter ADC a device which converts a smoothly varying signal to a quantised digital value Linearity resolution noise rejection and speed are important characteristics Auto Ranging the process of changing amplifier gain automatically so that the signal is amplified as much as is possible without exceeding output limits Auto Zero a stabilisation method for removing errors due to a drift in the input offset of a measuring system Bridge providing input offset and potentially temperature compensation bridges are a sensitive and stable means to me
23. n text text sends text to COMS port of logger n sends text to all COMS ports eg 27 Hello there M4J will direct the message to the COMS port of logger 27 The text string may be up to 250 characters long and can include control characters in the text as illustrated above e g see also ASCII Characters on page 23 Networking and Power Down Normally when a logger is asleep it will not wake when network activity begins To ensure proper operation the loggers must be kept awake by setting P15 2 Alternatively loggers can be programmed to be awake by ALARMs when network communications are expected Programming a Network The main difference between operating a single logger and a network of loggers is that the task of managing the returned data and alarms becomes more complex The best method for managing the network will depend on the goals data logging monitoring for alarm conditions rapid real time response e simplicity of programming telemetry or modem connection Don t underestimate the complexity of managing a large volume of data Unloading a Datataker with a large memory card over a network link can take over an hour There are two distinct class of networks part time and real time networks Part Time Network If the main task is data logging then communications between the network and the host computer can be infrequent hours days or weeks and so you can program and unload each logger in the
24. should be within 3 5 to 3 5 volts relative to Datataker ground Datataker models with a relay multiplexer and attenuator can accept higher input levels Select the most appropriate channel type for each sensor from the table on page 4 The second last column shows appropriate wiring configurations from pages 19 and 20 Connect the sensors accordingly Use channel options to modify channel function In a channel definition these are listed in brackets immediately after the channel type The table on page 5 describes the channel options Test each sensor by declaring a simple schedule For example RA1S 2PT385 4W will return every 1 second RA1S see page 3 the temperature of a platinum resistance temperature sensor PT385 see page 4 connected as a four wire resistance 4W channel option see page 5 on channel 2 Analog Input Channels An analog input channel on a Datataker is a four wire connection that allows voltage current resistance and frequency to be measured These are the fundamental signals output by most sensors It is not necessary to use all four connections two are often adequate As can be seen in the simplified drawing of a Datataker channel below there is a multiplexer and a programmable instrumentation amplifier between the screw terminals and the analog to digital converter The multiplexer is essentially a patch board that directs signals from the channel screw terminals to the amplifier inputs
25. specifies 2000pF maximum cable capacitance and 6V Gel Cell Battery 5 6 8Vde Lead Bat External Battery ction Lead no maximum distance The gel cell connection provides temperature compensated Connections Bat The Datataker 500 and Datataker 600 COMMS Port is charging with voltage 6 90V and current 1A limiting for a Bat Im ate Analog Inputs electrically isolated to 500V three cell battery when an AC or DC supply is also connected Alkaline 10 differential or 30 single ended can be used in any mix It is not recommended to connect both an internal and an Bat Sampling rate 25 samples sec external battery If two batteries are required it is better that the Linearity lt 0 05 RS232 COMMS Connector external battery is a larger capacity 12V battery and is Gnd JO T Gnd Input impedance 1M9 or gt 100 MQ selectable connected as External DC Power Common mode range 3 5 Vdc Common mode rejection gt 90 db 110 db typical NIC 1 Alkaline 1 Alkaline Power Consumption Series modeline rejection 35 db wc The DT500 and 600 will use little power if allowed to sleep Sensor excitation of 4 5V 250 0pA or 2 500mA each channel fm 2 Bat 2 Bat R k A f ven RxD at at Less power is consumed if the logger is powered via the battery Full half and quarter bridges voltage or current excitation N C inals rather than the AC DC terminals b he b Multiplexer type solid state CMOS terminal
26. 2 minute average drops below 4 5m s the report interval is returned to 15 minutes by the second alarm command IF2 Note the deliberate 0 5 hysteresis to prevent an oscillation around the switch over point Adaptive scheduling can reduce total data volume while giving greater time resolution when required Instead of changing the report interval as in the above example data logging could have been enabled or other schedules modified The possibilities are endless Combining Alarms Alarms can be logically combined to yield a single result by replacing the action text action commands of all except the last Alarm in the group with a logical operator for example IF1 3TK gt 100 OR IF2 2TK gt 100 OR IF3 5TK gt 100 AND ALARMA4 1DS gt 0 10S Temp Error RA5S where the message is output 10 seconds after digital input 1 is high and any one of the three temperatures exceeds and stays above 100 degrees Note the substitution of the keyword IF to improve readability of the program Only the delay period output channels and action text of the last Alarm are performed Available logical operators are AND OR and XOR You must order the Alarm numbers from low to high as evaluation is sequentially from low to high Missing Alarm numbers are allowed provided you do not define them elsewhere Output Format Introduction The Datataker has many ways to format data returned to the host computer and display Data format is controlled globall
27. N C access 100 meters at 1200 baud Greater distances N C are possible at 300 baud The maximum practical RxD distance is also dependent on the host computer s N C RS232 characteristics Note the RS232 standard TxD Baud Rate specifies 2000pF maximum cable capacitance and N C no maximum distance Q N C ARK 1200 The Datataker 50 s COMMS Port is electrically N C Q interface 9600 isolated to 500V Ground Mel 300 2400 1234 58 S78 Z8 4800 Analog Input Memory Card Socket to4 RS232 COMMS see page 8 Dip switch Port Isolated a Sed y __ 1 R 2 a 3 Digital O Height without memory card 50mm R 3 Pigital with memory card 105mm 110 mm 4 Weight 1 5kg rom 3 Ground R 1 a 3 pout Counters Power _ 4 3 AC DC Battery Y i Ground NNG SE ref Wake o 1 jol a Convert AC DC Lam Power wi y oo Display Single Ended p Connector Input 7 Reference 250 mm xs 270 mm naa Wiring Battery Bat Z Lead U O External Alkaline Battery 6 2 10V Alkaline Bat 5 6 8V External Gel Cell Battery The Datataker 50 COMMS port baud rate must match that of the host computer See COMMS Port on page 13 Note that if either 300 or 9600 baud is selected the logger address range is reduced to 0 7 x don t care s4 Mux Power Multiplexer Power on The power consumption of the loff Datataker 50 can be kept to a minimum if the input m
28. The table below lists all of the Datataker errors and an explanation of their likely cause and correction Errors that are a result of reading a channel will cause a value of 99999 9 to be returned or logged as the reading This value is not modifiable by format channel options Channel errors are normally carried through calculations and statistical evaluations so that they also return 99999 9 The carry through can be disabled by the j switch see Switches on page 11 Error Category Error Category O SA C O SEY E41 program area full attempt to store gt 4090 program char s in card E42 no card inserted no memory card inserted into card socket memory card not fully inserted memory card battery discharged memory card failure E43 RS485 chip failure RS485 Network interface hardware has failed e return logger for service E44 network transmission error e network integrity is failing a logger on the network has failed network traffic heavy E45 remote logger not found or network failure there is no logger with address specified logger at address specified has failed local logger not connected to the network e network cable is broken or wiring error E46 ROM checksum error ROM has failed checksum test Datataker may behave strangely e return logger for service E47 user string error e incorrect declaration texf E48 channel list fixed e channel list has been secured fixed by F enter
29. Vdc Bat and Bat Refer to the Appendix for details of your Datataker The following diagram shows a simplified power circuit 6 9V Switch Mode Regulator 9 2mV T AC DC Power 6 9V 1000F External Battery Lead Connections Bat Bat m Alkaline Bat ial Gnd O I Gnd Caution If a DC supply is grounded it MUST be a negative ground An AC supply MUST NOT be grounded If an external battery is connected to a Datataker 500 600 505 605 515 or 615 data logger which has an internal 6V gel cell battery then the external battery must also be a 6V gel cell battery and MUST be connected with the correct polarity or damage WILL occur Low Power Operation The Datataker uses little power and a set of six alkaline D cells can power the logger for over one year However precautions must be taken to avoid excessive current draw The Datataker has two states wake and sleep While in the wake state the logger is fully active and draws up to 500mA but typically 120mA In the sleep state only the counters nHSC clock and the wake circuit remain active and current draw is reduced to less than 0 4mA The Datataker will wake when any scheduled scan becomes due amemory card is inserted e characters are received at the COMMS port e the wake terminal is grounded a key is pressed on display versions The Datataker will sleep unless the program inhibits sleeping by setting P15 2 or by
30. a card program immediately irrespective of the setting of the Q switch Only the F switch will prevent the execution of the RUNPROG command see Switches on page 11 Transferring Data to the Card Normally data in the internal memory is transferred to the memory card after any card program is executed The transfer can take up to 100mS Datatakers with a display module will show the message Append depending on whether the data is appended to existing compatible data and shows the message Xfer when the transfer occurs If the card already holds data from a different program then no transfer occurs and Datatakers with a display will show the message Can t Copy Data When a single memory card is to be used to recover data and to reprogram the logger you must transfer the logged data before reprogramming This is done by using the COPY command in the program to force data transfer before the logger is reprogrammed COPY LOGOFF CLEAR CSCANS RA10M 1 5V LOGON Automatic data transfer from the internal memory to card can be prevented by placing a NOCOPY command on the first line of the card program The NOCOPY action is automatically cleared when the card is removed Clearing the Memory Card The data storage and program areas on a memory card can be separately erased as follows CDATA clears all data CPROG clears the card program CTEST clears data and program and tests the entire card CDATA and CPROG commands can be
31. auto calibration Ik or PO 1000 Conversion Time 15mS_ checking battery current P15 1 or 2 The conversion time the time during which the For the fastest possible scanning it is best to create a Datataker measures the input signal can be set by 8SV or schedule in which the channels are repeated for example P11 in terms of a frequency The conversion time is one full cycle of this frequency i e the conversion time 1000 P11 RA 1V 1V 1V 1V 1V 1V 1V IV 1V 1V IV 1V 1V IV 1V milliseconds combined with above methods will allow up to 75Hz rates Humidity Measurement Relative humidity is commonly measured by wet bulb depression Two temperature sensors are required one to measure air temperature and the other the cooling effect of a wetted surface Usually a temperature sensor is encased in a wick extending into a reservoir of distilled water The temperature difference between the two sensors is the wet bulb depression The following program will read two RTD s and compute the relative humidity with an accuracy of a few percent for temperature above 5C and over most of the relative humidity range The algorithm assumes that the sensors are ventilated but not aspirated Y1 6 1 0 44 0 014 2 71E 4 2 73E 6 2 75E 8 SVP poly Y2 0 100 RH BEGIN RA5S 1PT385 Dry bulb 4W 1CV 2PT385 Wet bulb 4W 2CV 3CV Y1 W 1CV A4CV Y1 W 2CV 5CV Humidity 2 FF1 4CV 0 8 1CV 2CV 3CV END The choice of temperature sensors is critical if reaso
32. days System Variable 15SV returns the day of the current year The default Date format depends on the Country DIP switch see the Appendices for your model Set the Date format by P31 for example P31 0 sets day number format The clock Date must be set in the current Date format for example if P31 1 European format then Date is set by D 25 12 1995 or D 25 12 95 n the day number format P31 0 day number 0 is 1 1 1989 The Date is maintained during a RESET or power down Time and Date stamp can be added to real time data and to logged data see Switches T and D on page 11 Time and Date are automatically logged whenever data is stored Internal Channels There are several internal channels which are read in he same way as normal channels Internal Channel Command Logger temperature 1 LM35 Expander Module n temperature n 1 LM35 Electrical zero at multiplexer 2 V Precision 100 02 40 1 2 R Precision 47002 40 1 Battery voltage Battery current Text String A Text channel of 80 characters is available for labelling data headings site identification logger identification etc The string is defined by my text string and the current string is returned or Unloaded whenever is included in a 3 R DTxx5 models 0 V M17 156 101 0 I M17 188 0 22 Time and Other Channels channels on the inside channel list Control characters are entered as for example AM for carriage return J for line fee
33. delay or width mS Counts Up counter 10Hz maximum c 1 4C 65536 range Phase encoder up down counter connect 3D 4D PE 1PE 65536 range High speed counter 1KHz maximum HSC 3HSC 65536 range High speed counter prescaler output HSCO 1HSCO 0 2 prescaler mode System Data System variable SV 3 5SV Variables General purpose variables for calculations etc cv 5CV 6 digits Text General purpose text for heading etc Q T differential only Relay multiplexer models only Geologger models only Indicates the capacity for each model a a The terminal not available for input on DT50 a See Channel Options 5 TJ AV NL MX NL Channel Options see page 5 and default options column mA Percent Ohms ppm ppm Hz uS Hz Time Day Counts Degc Degc Degc Degc Degc Degc Degc Degc State Byte State Counts Counts Counts none none none also F K R see Page 4 This Example declares a thermocouple type J connected to channel 5 as a single ended input The channel option NL indicates that the channel is not to be logged The logger returns two values the average reading AV at report time and the maximum MX since the previous report time Multiple Reports are possible trom each channel by adding additional sets of channel options The Datataker samples the channel eg 5 TJ only once every scan however the second and su
34. error during self calibration return logger for service e return logger for service E33 CSIO bus failure CEM or Display cable too long e return logger for service bad declaration of function key E35 Card Faulty card may have an electrical fault E36 CLAST not valid due to use of schedule UNLOAD E38 address error E40 no data found Move card write protect switch to unprotected commands not separated by spaces or return E22 statistical option error e statistical option not in each multiple report Schedule ID not A B C D S Xor Z scan time interval too large i e gt 65535 e scan interval type invalid i e S M H D Schedule ID is not one of A B C Dor X internal acquisition and alarm table filled additional channels cannot be declared TEST n where n is outside the range 1 to 2 E29 poly span declaration error polynomial or span index out of range 1 to 20 individual terms not separated by a comma range of terms outside 1 0e 18 to 1 0e18 E30 calibration failure nn e nn identifies the cause of the failure E31 test channel failure nn E32 battery sample failure E34 function key command error Network address out of range 0 to 31 No logged data to unload in specified time interval Page 21 Errors that occur as a result of reading an alarm channel are reported in the same way as data channels and the alarm condition automatically becomes true
35. executed from a card program However CPROG must be the last command in the card program since any commands after it will be cleared from the card before execution Removing the memory card s battery for more than two minutes also clears the card Page 8 Alarms limits and tests Introduction The Datataker Alarm allows you to make decisions about input channels timers the clock variables etc If an Alarm condition is true you can set digital outputs issue messages or execute commands to change Datataker function There are two basic types of Alarm ALARM or IF command which acts once on the transition from false to true ALARMR and IFR command which acts repeatedly while the alarms tests true The Number of Alarms Alarms share an internal scan table of up to 110 entries with the data acquisition schedules The scan table must be partitioned before any schedules or alarms are defined with the P30 command For example P30 40 will allow the entry of 40 alarms and 110 40 70 data acquisition channels P30 defaults to 20 alarms The Scanning of Alarms By default the Datataker scans alarms as fast as possible The actual rate depends on the number of Alarms and data channels defined As a rule allow 40mS for each analog input and 10mS for each Channel Variable time and digital input The Alarms schedule is triggered in the same way as schedules for data acquisition see Schedules on page 3 RZ rapidly
36. input circuitry of this device is extremely sensitive and therefore susceptible to damage by static electricity Always follow approved anti static procedures when working with this device CV 0002 A0 S02 Data Electronics Warranty Data Electronics warrants the instruments it manufactures against defects in either the materials or the workmanship for a period of 3 years from the date of delivery to the original customer This warranty is limited to the replacement or repair of such defects without charge when the instrument is returned to Data Electronics or to one of its authorized dealers This warranty excludes all other warranties either express or implied and is limited to a value not exceeding the purchase price of the instrument Data Electronics shall not be liable for any incidental or consequential loss or damages resulting from the use of the instrument or for damage to the instrument resulting from accident abuse improper implementation lack of reasonable care or loss of parts Where Data Electronics supplies to the customer equipment or items manufactured by a third party then the warranty provided by the third party manufacturer remains Warning Data Electronics products are not authorized for use as critical components in any life support system where failure of the product is likely to effect its safety or effectiveness Trademarks Datataker is a trademark of Data Electronics Aust Pty Ltd IBM
37. is considered a true alarm or recovery considered a true recovery e Alarms can switch digital outputs control display panel LEDs return alarm messages to the host trigger scanning and execute Datataker commands Data Storage e Battery backed internal RAM stores up to 13 650 readings e Supports removable PC Card PCMCIA memory cards 512Kbyte stores up to 170 000 readings 1Mbyte stores up to 340 000 readings Stack and circular buffer overwrite data storage modes No data loss when memory cards are exchanged Stored data can be returned for individual scanning schedules and for selectable date and time periods Data Format All data in ASCII floating point fixed point or exponential formats e Data format is user configurable for channel identification data resolution units text and delimiters Selectable host computer data format with bi directional error detection protocol Data Compatibility e Compatible with spreadsheets graphics and statistical packages e Compatible with most computers modems radio and satellite Programming All programming is by simple descriptive commands which are entered from a host computer via the host serial interface Commands can be pre recorded into a memory card and these are automatically executed whenever a memory card is inserted Display and Keypad LCD type 2 line x 16 character backlit alphanumeric Displays the most recent channel data
38. is powered through the battery terminals rather than through the AC DC terminals because the battery charger circuit draws additional current especially if it needs to charge a depleted battery Power Source Condition Current typical battery awake 100mA battery sleep 0 36mA AC DC awake 105mA AC DC awake amp charging 600mA AC DC sleep 5mA AC DC sleep amp charging 500mA Appendix Datataker DT500 and DT600 Page 25 6 9V Switch Mode Introduction COMMS Port aiso page 13 Power Supply and Battery Regulator Each model in the Datataker data logger range has a number The Datataker 500 and Datataker 600 COMMS Port is serial The Datataker 500 and 600 can be powered as follows 9 2mV T of characteristics that differentiate it from the other models This RS232 compatible The output signal level is approximately 4 F aie cash Source Range Terminal Terminal 6 9V page describes the characteristics for the Datataker 500 and the Volts allowing communications over distances in access 100 Datataker 600 meters at 1200 baud Greater distances are possible at 300 AC 9 18Vac AC DC AC DC 10 analog and 7 digital channels baud The maximum practical distance is also dependent on the De ay 1T 24de AC DC Gnd Network support host computer s RS232 characteristics Note the RS232 9V Alkaline Battery 6 2 10Vdc Alkaline Bat Channel expansion socket standard
39. network individually This is the same as using a single logger except that you must address each logger Page 14 Real Time Network Where the emphasis is on rapid response or tracking conditions network speed becomes vital There are many ways the network can be managed however as a general rule more speed leads to more complexity in host software 1 Poll channels one at a time This method is simple but slow Any polling over a network can take up to two seconds before a reply is received As only one operation is undertaken at a time there can be no confusion about the source of the data For example poll assume n u 21 2V receive 156 54 poll 29 STT receive 105 1 The polling speed can be as low as one channel every two seconds 2 Poll by alarms one at a time using the n command see Polling Alarm Data on page 9 This is similar to method 1 but is slightly faster as it returns the last reading of the alarm channel rather than initiating a new scan 3 Poll channel groups using the RX schedule see Polled Schedule on page 3 For example program logger 21 21 RX 2V 3 4TT FF1 u n logger 29 29 RX 1 4DS u n poll logger 21 21 X receive 156 54 23 5 28 9 poll logger 29 29 X receive 0110 This method retains most of the simplicity of method 1 but is faster up to 20 channels every two seconds 4 Poll all alarms on a logger by the ALL command see Polling Alarm Data on page 9 This is similar t
40. output channels Maximum of two CEMs Digital Input Channels Accept voltage free contact closure inputs inbuilt 15K pullups and TTL CMOS inputs e Measure the logic state of individual channels bit or of groups of channels byte e Generate digital transition events to trigger data acquisition Also provide low speed counter functions to 10Hz sensitivity 0 to 65535 range presettable not available on CEM Digital input channels share with the digital output channels e Analog channels can be used to read digital state with user definable state threshold Digital Output Channels e TTL CMOS compatible digital output channels Open collector lines rated to 30VDC 200mA e Used for switching logic states for relay control for alarm annunciation and sensor support Digital output channels share with the digital input channels Counter Channels 3 separate high speed counter channels on all models e Count at up to 1KHz normally or up to 500KHz optionally 0 to 65535 range presettable Count even when logger is asleep Time and Date e Hardware clock independent 10 year lithium battery e Resolution 1 second accuracy 2 seconds day 0 to 50 C e Date in formats Date DD MM YYYY Date MM DD YYYY Day number DDDDD Decimal day DDDDD DDD e Time in HH MM SS decimal hour HH HHHH and seconds SSSSS 4 auto incrementing internal timers second minute hour and day of week for use in sequencing alarms calculation
41. pads Attenuated Input with External Reference Config 6 ke Examples A 1v0 5V 100 r atten R1 R2 R2 Attenuated voltage inputs for situations where one signal line is always close to ground potential Half Attenuated Differential Input Config 7 Power Examples Supply iH 1 10 1 5 L c jca Ground You can combine this arrangement with the External Shunts arrangement to give four single ended current channels for each full differential channel Single Ended Current Input with Internal Shunt bus bar To avoid cross channel coupling connect the bottom of the shunts with the minimum of shared resistance to the SE ref take off point The excite terminal cannot be used as a single ended input on the DT50 Single Ended Current with External Shunt Examples 2l 1 101 5L 10 Note Common mode voltage limits must be adhered to for correct operation For models with CMOS multiplexers this is 4 volts relative to the Datataker s ground Differential Current Input with External Shunt Config 9 Examples 2R 4W 3R 4W 5PT392 4W Four Wire Resistance Input Config 10 Examples 1R 2R I 3PT385 Three Wire Resistance Input Config 11 Examples 3R KSR 4PT385 You can get lead compensation by replacing the lower link with a resistor of value equal to the
42. s rati er than tl e F terminals because the battery Q TxD 3 Lead 3 Lead charger circuit draws additional current i N a i For each analog input type the Datataker 500 and Datataker Internal Gel Cell Battery Internal Alkaline Battery Power Source Condition Current typical 600 provides three decade ranges that are selected N C automatically nc dari battery awake 100mA O battery sleep 0 36mA Input Type Channels Range Units Reso Ground AC DC awake 105mA DE SE lution L pat MLO AC DC awake amp charging 600mA DC Voltage 10 30 25 mV AV T Bat s i AC DC sleep 5mA 250 mV 10V 9 18vac Gnd O AC DC sleep amp charging 500mA 2500 mV 100V External Battery DC Current 10 40 0 25 mA 200nA External DC Power External AC Power 6 9V Gel Cell or 9V Alkaline 2 5 mA 1pA 25 mA 10pA n Resistance 10 20 10 Ohms 0 5MQ Address o Caution To avoid damage use 6Volt lead acid battery only ensure correct polarity before connecting the battery 100 Ohms 5mQ gt pane Digital Counters Analog Channels 500 Ohms 50ma 3 gt SN A Rs232comMS So o 0 57 Sq 3 2 1 Cette doma 2 orlen fon lon BOQ Dip Switch Por Isolated cee r 13 278321R 1R R IRR eR RO OP Frequency 10 30 10 1 20 000 Hz 0 01 3 loff on lo Shown set to the I SS Ne DE refers
43. s RA10S 1 5TT places the r s RA10S 1 5TT program on function key F2 Each command sequence may be up to 255 characters and must be entered in a single line The default function key assignments are K1 LED On 1 3WARN 1 K2 LEDOff 1 3WARN 0 The function keys can be very useful For example they can be used to completely reprogram the Datataker A different program could be assigned to each key They can be assigned by ALARMS Remember however that stored data must be cleared before a new program can be loaded Light Key Toggles the back light on and off Setting 6WARN 1 turns the back light on and SWARN 1 flashes it When the Datataker sleeps the back light is switched off In conjunction with List key the Light key enables or disables items for display Disabled screens are flashed while the List key is pressed but are not visible when the key is released Bg Logging to Internal Memory J Datataker Label Area you can label the warning LEDs with a felt tipped pen Status Screens There are 8 status screens see Scrolling through the Status Screens which display system information By default all screens are available for display and enabled They can be disabled using the List and Light keys Status screens can be made unavailable for display by P19 Each bit in this parameter value represents a status screen A 1 enables and 0 disables The bit mapping is P19 bit map msb 7654321
44. stored in an inserted memory card 00 11 33 on 05 11 1992 00 13 00 on 19 01 1993 External data Start End times These and other STATUSn commands are described fully in the Datataker Advanced Communications Manual P 11 Parameters internal settings ts A s SY ES Introduction VPI vy Parameters are internal system PO Calibration interval uV 0 to 10 000 Input zero drift allowed before re calibration see Accuracy on page 17 settings They are global in their effect P1 2 500 volt reference trim 10V 30 000 to 30 000 Software trim of 2 5000 volt reference for calibration see Accuracy on page 17 and let you set a variety of options As a P2 Temperature trim 0 001 30 000 to 30 000 Trims internal LM35 temperature sensor For thermocouple reference junction temperature calibration see page 16 general rule set the parameters that P3 Reference resistor trim ma 30 000 to 30 000 Trims the internal 100 0 0 1 reference resistor see Accuracy on page 17 require changing before you program P4 Lost count flag count read only If this is greater than zero then counts may have been missed by the low speed counters schedules and alarms P7 Network turnaround time 14mS 1 to 30 000 Set as number of 14mS intervals Useful for use with radio modem network Typically would set P7 22 corresponding to 300mS P9 Remote network error errors 0 to 30 000 Network errors have occurred if P9 gt 0 Setting Parameters P10 ADC settling pe
45. the N switch is enabled default then the word Datataker is added to the logger address and the channels are identified Datataker 19 1TT 25 6 2TT 45 8 3TT 32 7 If the units text switch is also on U then the returned data will look like the following Datataker 19 1TT 25 6 Deg C 2TT 45 8 Deg C 3TT 32 7 Deg C Note that the logger address is placed at the beginning of each schedule s scan report Data unloaded from the data memory is treated identically An alternative method to identify the Datataker from which the data is being sent is to load the Datataker with an identifying string e g Logger 19 which is then included in a schedule For example the program 19 Logger 19 19 1 3TT P22 44 n u will return data to the host Logger 19 25 6 45 8 32 7 This method allows any string of up to 80 characters to be used as the logger identification Special control characters may be included to assist in identification See Text String on page 6 and ASCIl Decimal Equivalents on page 23 Setting the Address The Datataker address is set by a DIP switch in a binary code The DIP switch is accessed by removing the Datataker top cover Refer to the Appendix for your model Datataker for location and setting details Datatakers are shipped with the address set to 0 If you give two loggers the same address then network errors will occur when commands are directed to them The Datataker models without network sup
46. the output channels if any reflect the state of the Alarm Action line in the above diagram This line changes state only after the full delay period has expired Action Text optional Text placed in quotes is sent to the host computer and display whenever an ALARMn or an IFn alarm transits from false to true or repeatedly at the RZ rate while an ALARMR or IFR alarm remains true and any delay period has expired The action text may be up to 200 characters however the total text space reserved for all Alarms is 4000 characters Note There is no garbage collection in this text space Each new action text is appended to the list and superseded text is only removed by a RESET or CALARMS command Control characters can be embedded in the Action Text such as G bell M CR L LF b quotes etc Various data can be placed into the Action Text by including special substitution characters insert Datataker address and alarm number a n insert current data value insert day or date in P31 format insert time in P39 and P40 format e g the Action Text Boiler Pressure MPa will return Boiler Pressure 1 563 MPa on each false to true transition of the Alarm No Action Text is issued on the true to false transition Setting the Z switch to z will stop the return of the Action Text to the host see Switches on page 11 This is useful when the Action Text is only required for the display Page 9 This Exa
47. time to process a down loaded program This can be achieved by using the XOFF XON protocol or by time delays between transmissions Waking From Sleep Mode If characters are received while the Datataker is in Sleep Mode the Datataker wakes Characters received in the first 75mS are lost Characters received between 25 and 75mS after the first character may generate communications errors and should be avoided To reliably wake and communicate with a Datataker that may be in sleep mode send a carriage return or line feed and wait 300mS before sending commands Password Protection The Datataker has a password protection scheme on the COMS port When enabled communications through the COMS port is only possible after the user defined password is entered Password protection is particularly useful when the Datataker is connected to a modem This eliminates the situation where line noise may be interpreted as commands during call establishment Unauthorised access also becomes more difficult The password is set by assignment PASSWORD password text where the password text may be any string except for command keywords up to 10 case sensitive characters Assigning a null string i e PASSWORD removes a password To establish communications enter the password followed by a carriage return at any time This signs the user on The COMS port stays open until the SIGNOFF command is issued or while there is communications act
48. total lead resistance This configuration is recommended only for resistances gt 500Q Two Wire Resistance Input Examples 5R 4W 5 Rill The measurement current passes through both resistors By definition nR 4W and n R will measure R1 and R2 respectively This configuration does not provide lead compensation for R2 Mixed Resistance Input Page 19 Examples 1BGI 120 0 3BGI 1 350 Re can be a bridge completion resistor for the same value as the active arm located near the logger or preferably an active arm of the bridge This configuration compensates for lead resistance and in the case of a half bridge temperature compensation For quarter bridge 120Q foil strain gauge the resolution is 2uStrain The configuration is also useful to read the position of the wiper of a potentiometer The channel factor is set to the potentiometer s resistance lt 5KQ eg 2BGI 2000 Three Wire Half and Quarter Bridge Input Config 14 Examples 1 5BGI 350 4BGl 2BGI Y1 To other bridges To other channel R terminals The bridge completion resistor is shared between channels Its value is equal to the nominal value of the unknown resistor The configuration is similar to Config 11 no reference channel is needed Multiple Three Wire Quarter Bridge Inputs Examples 3BGI 4W A 4BGI 120 4W 5V II Y3 The bridge is powered by th
49. 0 Isb Sign on 128 Be Bat 1 Time amp Date 64 Card 2 Schedules Active 32 Memory 4 Schedules Halted 16 Logging 8 To make screens available set P19 to the sum of the numbers following the required screens e g for Battery Condition and Logging Status screens only set P19 9 i e 1 8 By default P19 255 and all screens are available lf P19 0 and there are no channels or alarms to display then the Sign On Screen is displayed Any status screens disabled by this method are not available for display by the List key Power Consumption The Datataker Display Panel draws less than 3mA while the back light is off However with the back light switched on the current draw increases to approximately 80mA This is very significant and represents a 70 increase in the logger s normal power consumption The result can be that battery life is reduced when the back light is left on However if the power mode is left at the default see Setting the Power Mode on page 15 the display power consumption should not be an issue Scroll Keys Allow scrolling through the displayable screens Holding a scroll key down for more than three seconds starts auto scrolling in that direction The scroll speed is set by P18 in seconds By default P18 2 seconds Pressing either scroll key stops the auto scroll Warning LEDs amp Buzzer Three LEDs may be illuminated under program control for example 1 2WARN 1 3WARN 0 s
50. 18 Auto scroll time seconds 29 1 to 255 Time in seconds to display each screen when Display is in scroll mode see Scroll Keys on page 12 original values for these are restored on leaving the fixed format mode 0 255 Bit map of status screens to display on Display see Status Screens on page 12 P19 Status screens to display bit map 255 0 P20 Wake schedules bit map 0 0 to 255 Bit mask of schedules that are not to wake the logger DCB A S X Z see Low Power Operation on page 15 5 P21 Return data to address address 128 0 to 128 Logger address to which returned data is to be sent P21 address P21 defaults to 128 which means normal addressing Reading Parameters P22 Data delimiter character ASCII 32 space 1 to 127 ASCII character as decimal number between data points in u mode see Output Format on page 10 Forced to 44 by H Entering the command P23 Calibration samples count 3 1to 10 Determines calibration noise a compromise between calibration speed amp accuracy P24 Scan delimiter ASCII 13 CR LF 1 to 127 ASCII character as decimal number between groups of data points in a scan in u mode see Output Format on page 10 P22 P25 Unload completed character ASCII 0 none 0 to 127 ASCII character as decimal number that is placed at the end of an Unload dump in u mode see Output Format on page 10 will return the setting of parameter 22 P26 XOFF timeout before XON seconds 30 1 to 254 Timeout before XOFF is automatically switch
51. 25 26 27 COPY command 8 counter 4 18 20 events 3 19200 Hz input 26 country setting 10 24 25 26 CSCANS command 3 current input 4 19 loop 4 20mMA 4 19 data bits 13 data retrieval 8 date D 6 delay period digital output 4 alarm condition 9 differential input 4 19 23 27 attenuated 26 digital events 3 input 4 output 4 19 DIP switch 13 14 15 24 25 26 rA display 5 14 alarms 12 backlight WARN5 WARN6 12 options ND W BG 5 12 END command 2 3 error messages En 21 errors response to 21 event schedules 3 triggers nE n mE 3 excite terminal 4 19 20 expression evaluation 7 external excitation 28 format of output 5 10 frequency measurement 4 27 function keys 12 functions 7 gain option Gn 5 22 Geologger 27 Grey code conversion F7 7 ground loops 17 23 guard G 6 23 H halting schedules 3 high voltage measurement 4 20 26 host computer 1 13 14 humidity measurement 18 HZ halting alarms 3 9 IBM PCs 13 IF see alarms 9 immediate scans 3 input termination 5 22 19 interface wiring 13 internal channels 6 24 25 26 28 27 intrinsic functions 7 isolation of COMS port 13 24 25 26 isothermal block 16 keypad 12 LCD screen 12 light key 12 line frequency P11 8SV 1 5 6 27 list key 12 listing alarms STATUS3 9 10 schedules STATUS2 3 10 local logger 14 logging 8 11 disabled 8 status 8 logical operators 7 LOGOFF command 8
52. 4TT Temp RC15M 1V AV Y10 6L AV S1 AV AV S1 S Schedules page 3 Four general purpose schedules RA RB RC and RD each a list of channels to be scanned at programmable time intervals or on events A special schedule RX allows polling from a host computer Parameters page 11 are internal system settings which determine system function Most can be set and all can be read a Scaling page 7 Various methods can be used to scale output data to engineering units These are the Channel Factors Functions Spans Polynomials and Calculations BEGIN amp END see Schedules on page 3 Logging page 8 Global data logging is activated by the LOGON command Disable logging of particular channels by the NL channel option Channels page 4 A wide range of channel types provide sensor support Options allow custom configuration Channel lists entered without a schedule ID return data immediately and cannot be logged to memory Scan control commands see page 3 Data Retrieval n u P22 32 Disables channel identification and units and sets the output format to ASCII 32 i e space delimited data Begins to unload stored data oldest data first if a memory card is fitted card data is unloaded first Terminates unload Clears data from the Datataker s internal memory and disables logging Clears data from the memory card if fitted Logging is not disabled Data from the logger s inter
53. 6 44031 45006 46006 46031 46041 44907 44908 RTDs Introduction Resistance Temperature Detectors or RTDs are sensors generally made from a pure or lightly doped metal whose electrical resistance increases with temperature Provided that the element is not mechanically stressed and is not contaminated by impurities the devices are stable reliable and accurate Datatakers support four RTD types PT385 PT392 NI and CU Standard Metal Alpha EE F pti 1000 1500 l 500 Temperature Platinum 0 003850 DIN43760 Platinum 0 003916 JIS C1604 Nickel Copper a 0 005001 a 0 00390 Page 16 Introduction Thermistors are semiconductor devices that change their electrical resistance with temperature Therm istors measure temperatures from 80C up to 250C They are sensitive but highly nonlinear Data takers support all two wire YSI thermistors The response is 1 a b Ln R c Ln R The constant terms are those recommended by YSI As the Datataker is unable to measure resistances over about 7KQ a resistor should be connected in parallel when a thermistor is expected to exceed 7KQ Parallel Thermistor P Resistor 7000 x R max P Rra 7000 mS where Rmax is the maximum value of the thermistor s resistance at the lowest expected temperature The value of Rp is placed in the channel option list e g 5YS07 10000 The resistor quality shoul
54. 9 text 9 accuracy 17 address 1 11 14 24 25 26 alarm 9 combining 9 number 9 output channels 9 schedule 3 9 arithmetic operators 7 assignment to parameters 11 to variables 7 to digital outputs 4 attenuated input 4 17 19 26 B bar graph display 10 channel option 5 battery 15 connection 1 15 22 current 6 life 15 26 voltage 6 baud rate 1 13 24 25 26 BEGIN command 1 13 bridges 4 17 19 20 current excitation 17 voltage excitation 17 buzzer 4WARN 12 C CALARMS command 9 calculations 7 by channel options 5 7 calibration auto interval PO K 11 using spans 6 CARDID command 8 CDATA command 8 channel expansion 27 factor 4 10 13 17 identification 3 5 10 12 28 lists 3 numbering N 3 4 28 options 5 sequences 4 28 types 4 characters special 13 CLAST command 8 CLEAR command 8 clearing alarms 9 card data 8 card program 8 schedules 3 stored data 8 comments 2 13 commands BEGIN 3 CALARMS 9 CALARMn 9 CARDID 8 CDATA 8 CLAST 8 CLEAR 8 COPY 8 CPROG 8 CSCANS 3 CTEST 8 END 3 G GA GB GC GD GS GX GZ GZn 3 9 H HA HB HC HD HS HX HZ HZn 3 9 LOGON LOGOFF 8 NOCOPY 8 PASSWORD 13 Q8 RESET 10 RUNPROG 8 SIGNOFF 13 STATUS STATUSn 10 TEST TESTn 10 U UA UB UC UD and UX 8 computer format mode H 10 11 COMS port 1 13 isolation 12 22 25 26 conditional scanning nW 3 tests 9 expressions 7 convertlamp 24
55. Adad Ret Analog Channels o 4 onnector 9 18 Jon Joff off lon Jo The Country Setting determines the Lamp switched 9 2 19 jon off jon jon default integration period 16 7mS for US 250 mm 3 20 Jon on joff o and 20mS for others for the analog to 7 270 mm i Boge ee eel coca o lt digital ae ee ae date High Voltage Measurement Auxiliary Dip Switch x 23 lon on bn lon page 9 The Datataker 505 and 605 models have a switchable The four way Auxilliary Dip Switch provides T four wire on the and SERef lines attenuator after additional versatility gt a gt j 2 Baud Rate and Address the input multiplexer In each case attenuation is relative to ai pleseived must z Sel ne z 3 jen 2 oh Dip switch position four s4 is not ground The attenuators on the differential inputs and mA default position otherwise 26 jon jon joff jon jo available for setting the address if 300 or Are matched to ensure high common mode rejection network operation will be g A ba y 4 af 9600 baud rate is selected This reduces By default two channel types automatically switch in the impaired T 2 Solon ilon the address range to 0 16 attenuators nHV and nL See Channel Types on page With s4 in the ON position a 30 lon n lo 4 for more details For other channel types use the A og 19200 Hz frequency signal is 31 lon Plon channel option to switch in the attenuators e g 2AS A See Default positions w applied to the High Speed for SW2 dip switch Counte
56. Add to display blocked by NO all interna not in card Append NOCOPY in card cata i mo Troe 9 program program ae NO YES NO Does NO Continue logging to Sound one extra beep and display inter al Can t Copy Data y i TF TTTTTFTSNNNNP o DATA Issue E17 message to serial port DECISIONS Appendix Specifications Introduction The Datataker range of data loggers are all microprocessor based battery powered or mains powered data loggers which can measure all of the fundamental signal types and have direct support built in for a wide range of commonly used sensors Data manipulation includes sensor calibrations real time statistical functions and real time calculations The acquired data can either be returned to a host computer in real time or can be logged into memory for later recovery Data can be stored in battery backed internal memory or in PC Card PCMCIA memory cards which can be periodically removed from the logger to transport the data Alarms can be set for all input channels and can be annunciated by switching of digital outputs returning alarm messages to a host computer and displaying alarm states The Datataker models differ only in the number of input channels the type of analog channel multiplexing and expansion and display options All models support the same signal types and sensors and have the same capabilities for acquiring manipulating and logging data The Datataker data logger
57. Ah alkaline battery The logger and battery are mounted into a supporting frame which locates in the base of the enclosure The frame can be lifted out for easy access to the screw terminals and connectors of the logger Optional subassembly to also install a CEM A Panel Mount Display module can be factory installed into the lid of the enclosure by special order e Normally used with the lid open however cable for cable entry can be installed by the user Size of portable enclosure is Dimensions mm Length Width Depth Weight Portable Enclosure PE 355 260 155 3 5kg 1 00 12 4 90 DT50 amp DT500 released 1 10 26 7 90 Major Revision Syntax changes to schedules amp commands Card operation changed A C S Y switch changes New sensor support Ni RTD s Thermistors 1 11 to 1 20 4 6 91 Various minor bug fixes PASSWORD added Improved 3 wire resistance calibration 2 00 2 5 91 Major Revision Card operation changed BEGIN amp END added and append dropped Expression evaluation added Difference integrate amp rate functions added Minor syntax changes Changes to C G N Z switches Channel ID text added LCD display support added 2 01 to 2 03 24 5 91 Various bug fixes DEL character processing change 2 10 23 8 91 Significant Revision Time and date automatically stored UNLOAD from date to date added Histograms added Counter operation changed Variables as ALARM setpoints allowed Floating point rounds rather than tr
58. Datataker and for receiving data If you are using a different computer type construct or purchase a communications cable see COMS Port on page 13 for wiring details Load and run a terminal emulation or communications program and ensure that the computer s communications parameters are set to the Datataker s default settings Baud rate 4800 Data bits 8 Stop bits 1 Parity none Protocol XON XOFF The second task is to connect power Connect the output from the power adaptor 240 or 110 Vac to 12Vdc to the two screw terminals marked or AC DC depending on the Datataker model Polarity is not important A word of caution do not connect external power to the terminals labelled Bat These are reserved for an external battery and have a limit of 9 volts DC See Power and Battery Connection on page 15 for information on power connection and power consumption When power is switched on the red Convert Lamp flashes for about half a second The following message appears on the computer display Datataker 0 Version 5 xx Initializing Done If a charged internal or external battery is already connected to the logger then this will not occur as the unit is already powered and does not perform another cold start If communications are OK then typing an upper case T followed by the Enter key or Alt L in DeTerminal returns the current time this may be different to your local time Time 09 10 55 The Dat
59. Datataker commands Executing Datataker commands from an alarm can be particularly useful in modifying the Datataker s program in response to changes in input s Prog ramming see Sample Program opposite You program the Datataker by entering schedules and other commands Entered commands are not processed until a carriage return is received The input buffer is 254 characters so command lines must not exceed this length Each command must be separated by one or more spaces tabs or carriage returns All schedules must be entered on one line or placed between the BEGIN and END keywords The BEGIN END construct is also very useful for enhancing program clarity When the BEGIN keyword is encountered the Datataker is halted and prepared to receive a new program As each line of the program is entered it is compiled into a new task The END keyword indicates that all schedules have been entered While the BEGIN END construct is necessary only for the entry of multi line schedules it can contain any other commands Placing switches parameter definitions and alarms in the construct gives a program a more structured and easy to read appearance especially if indenting is used Managing Power page 15 In applications where power consumption is critical the Datataker has a sleep mode which reduces battery current draw from 120 400mA to less than 0 4mA The Datataker will automatically wake from sleep mode when input channels ar
60. MOS For each analog input type the Datataker 50 provides three decade ranges which are selected automatically Input Type Channels Range Units Reso DE SE lution DC Voltage 5 10 25 mV 1V 250 mV 10V 2500 mV 100V DC Current 5 15 0 25 mA 200nA 42 5 mA 1pA 25 mA 10pA Resistance 5 10 10Ohms 0 5mQ 100 Ohms 5mQ 500 Ohms 50mQ 7000 Ohms 500mQ Frequency 5 10 0 1 20 000 Hz 0 01 DE refers to double ended or differential channels and SE refers to single ended channels see Glossary on page 23 Accuracy is expressed as percentage of reading at 25 see page 17 Digital Inputs and Outputs 5 TTL CMOS compatible digital input channels for digital state digital events low speed counters 10 Hz 16 bit presettable Digital input terminals are shared with digital output channels 5 Digital open collector outputs rated to 200mA at 30V 3 high speed counters 1KHz or 1MHz 16 bit presettable All analog channels may also be used as digital inputs with a user definable threshold Input Type Channels Range Digital Bit 5 Oor 1 State Digital Nibble 1 0 to 31 State LS counter 5 65535 Counts HS counter 3 65535 Counts Power Supply and Battery aiso page 15 The Datataker 50 can be powered from a variety of sources Source Range Terminal Terminal AC 9 18Vac AC DC AC DC DC 11 24Vde AC DC Gnd 9V Alkaline Battery 6 2 10Vdc Alkaline Bat 6V Gel Cell Battery
61. PC IBM XT IBM AT and IBM PS 2 are trademarks of International Business Machines Corp Macintosh is a trademark of Apple Computer Inc Windows is a trademark of Microsoft Corp PC Card and PCMCIA are trademarks of the Personal Computer Memory Card Industry Association Firmware ROM Versions This manual is applicable to the Series 2 Datataker data loggers fitted with firmware version 5 xx The version number is returned in the first line of the TEST command see More Commands See Firmware Change History for compatibility with the earlier firmware versions Related Documents Getting Started with Datataker Reference Manual Advanced Communications Manual Related Products DeTerminal for DOS DeTerminal for Windows DeLogger DeLogger Pro DeCopy Delmage DeLink DDE Server Panel Mount Display Sensor Simulation Panel Memory Cards Memory Card Interface Data Electronics Aust Pty Ltd 7 Seismic Court Rowville VIC 3178 Australia Tel 61 3 9764 8600 Fax 61 3 9764 8997 E mail datataker dataelec com au Data Electronics USA Inc 22961 Triton Way Suite E Laguna Hills CA92653 USA Tel 1 714 452 0750 Fax 1 714 452 1170 E mail deusa datataker com Data Electronics UK Unit 26 Business Centre West Avenue One Letchworth Garden City Hertfordshire SG6 2HB England UK Tel 44 1462 481 291 Fax 44 1462 481 375 Internet Home Page http www datataker com dtaker Datataker Man
62. Resolution 15 bit plus sign 1 pV Sampling rate 25 samples second e Accuracy better than 0 15 of full scale e Linearity better than 0 05 Input impedance 1MQ or gt 100MQ selectable Common mode rejection gt 90db 110db typical Series mode line rejection gt 35db Floating common input for single ended measurements Analog Sensor Support All Models 4 3 and 2 wire resistance RTD and thermistor measurement e Sensor excitation of 4 5V 250 0uA or 2 500mA each channel Full half and quarter bridges voltage or current excitation 4 20 mA current loops internal or external shunts Thermocouple types B C D E G J K N R S and T with cold junction compensation and linearization Platinum RTDs a 0 0038509 9 C any resistance Platinum RTDs a 0 0039169 9 C any resistance e Nickel RTDs a 0 0050019 9 C any resistance Copper RTDs a 0 00399 9 C any resistance Thermistors Yellow Springs YSI 400xx series Semiconductors AD590 LM335 LM34 and LM35 Analog Sensor Support Geologger 515 615 e Vibrating wire sensor support 30V for 100uS pulse excitation 50 to 3002 coils 0 5 to 5KHz frequency range phase lock loop filtering loudspeaker for troubleshooting Digital Channels Datataker 50 e 5 digital input output channels Datataker 500 600 505 605 and Geologger 515 615 4 digital input output channels e Expansion by Channel Expansion Modules with 20 digital input and 10 digital
63. The most significant source of error is the reference junction The Datataker must not be exposed to differential heating as a single reference temperature sensor is used to measure the temperature of the screw terminals of all channels Should a temperature gradient occur along the terminal strip then errors of the magnitude of the temperature difference will occur The Datataker s basic measurement accuracy can be a source of error The zero error is 4uV for inputs up to 30mV 40yV for inputs up to 300mV while the scale factor error is 0 1 For a T type thermocouple at 100 this can result in an error of 0 2T climbing to 0 5T at 400 Note also that the error is dependent on thermocouple sensitivity For example the K type thermocouple at 1200 the error can be as high as 2 1 The Datataker s linearisation errors are much lower than other error sources These errors are additive and are generally contained within the error bounds as shown in the following diagram the reference junction error is assumed to have been trimmed out 2 0 amplifier 1 5 gain change os O zero error rror imit in earisation e 44001A 44101A 44002A 44102A 44003A 44101A 44035 44004 44104 44033 45004 46004 46033 46043 44901 44902 44005 44105 44030 45005 46005 46030 46040 44903 44904 44007 44107 44034 45007 46007 46034 46044 44905 44906 44017 45017 46017 46037 46047 44016 44036 46036 44006 4410
64. V overange mCV total counts see page 6 Assign Add Subtract Multiply The variables are like memory registers in a calculator You can assign them directly e g 1CV 2 5 or assign a channel reading to the variable at scan time e g 1V 7CV You can read the contents of a variable modify it and then replace it with the modified value For example 1V 7CV means the value of 7CV is divided by the reading on channel 1 and the result is returned to 7CV Divide NOTE These actions occur only at report times and not during statistical sampling e g FF2 returns 71 46 mV e g FE2 returns 7 14e1 mV Uses exponential format if exponent is less than 4 or greater than n Replaces the channel type text returned to host when enabled by C U N and on the top line of the display if present Channels tagged with NR are not returned to the host computer Useful for display channels e g Bar Graphs that need special formatting Channels tagged with NL are not logged but they are returned to the host computer Channels tagged with ND cannot be displayed on the LCD screen if present in either normal or display list modes Channels declared as intermediate working channels are not reported or displayed unless the working switch is on W They are not logged Plots a bar graph on display x lower limit and y upper limit see Bar Graph on page 12 Order of Application this column indicates the order in which the options are app
65. Vibrating Wire Support x x x x x v v Digital Channels Input Output 5 5 4 4 4 4 4 4 4 4 4 4 4 4 Counter Channels Fast Slow 3 5 3 4 3 4 3 4 3 4 3 4 3 4 Channel Expansion x Vv Vv Vv Vv Vv Vv Isolated RS232 Vv Vv Vv Vv Vv Vv Vv Max Baud Rate 9600 9600 9600 9600 9600 9600 9600 Supports Datataker Network x Vv Vv Vv Y v v Integral Display x x Vv x Vv x Vv Panel Mount Display Option Vv Vv x Vv x v x Internal Battery x Vv Vv Vv Vv v v DT50 DT500 DT505 DT515 Appendix Specifications cont Analog Input Channels Datataker 50 5 differential or 10 single ended can be used in any mix e Solid state multiplexers Common mode range 3 5VDC Datataker 500 600 10 differential or 30 single ended can be used in any mix e Solid state multiplexers Common mode range 3 5VDC Expansion by Channel Expansion Modules CEMs with 10 differential or 30 single ended analog channels Maximum of two CEMs Datataker 505 605 and Geologger 515 615 10 differential or 30 single ended can be used in any mix e Relay multiplexers Common mode range 100VDC e Input withstanding voltages for analog channels Unselected channels 1 5KVDC for 10S 500VDC for 50mS 100VDC continuously Selected channels 100VDC continuously Expansion by Channel Expansion Modules with 10 differential or 30 single ended analog channels Maximum of two CEMs Analog to Digital Conversion All Models Autocalibrating e Autoranging over 3 decades
66. able screens for display By default status and channel data screens are displayed Alarm screens must be manually enabled for display or by setting A Scrolling above the top status screen moves to the last alarm screen or the last data channel screen if no alarms Battery Condition Approximate percent charge charging T or discharging 4 battery current battery voltage battery temperature Int Memory Used 10456 73 Logging is OFF Schedules Halted CDX Schedules Active ABZ Time 12 53 12 Date 21 02 91 I Datataker Q 4800 50Hz V5 xx Channel 5LM35 20 1 C Thermopile 0 P 25 751 mV Low Fuel High Alarm 35 OFF 350 47 MPa or OFF Card Memory Used Card Not Present Memory Card Data The number of 45234 54 or data points logged and the percentage of memory card used if present Memory Data points logged and percentage of internal memory used If logging to a card internal memory is used when the card is full if in stop when full mode o Logging to Logging to Logging or Memory Card or Internal Memory Condition and destination Schedules Halted and defined Schedules Active and defined i e not halted Time and date in the formats specified by P39 and P31 Sign On Screen showing address baud rate line frequency and firmware version Displayed on power up or RESET Default Channel Display format e g 5LM35 The value is of the most recent sc
67. alarm status and system information including time battery status amount of data stored e 5 key keypad for display selection scrolling and backlight e Keypad also used as 4 user definable function keys 3 LEDs a beeper and a flashing LCD backlight provide for local warnings by alarms etc e Operating temperature range for LCD is 5 to 65 C Integral in the Datataker 600 and 605 and Geologger 615 Also available as a separate Panel Mount Display for mounting into instrument panels and enclosure doors which connects to the Datataker 50 500 and 505 and the Geologger 515 Host Communications e RS232 full duplex isolated to 500Volt 300 1200 2400 4800 and 9600 baud switch selectable Bi directional XON XOFF protocol e Selectable high level protocol with 16 bit CRC checking Compatible with computers terminals modems satellite ground terminals serial printers etc Network Communications Not DT50 e RS485 with error correcting protocol e Connected via a twisted pair maximum 1000 metres Up to 32 loggers can be in a Datataker network with one host Power Supply Voltage 9 18VAC or 11 24VDC external power e Mains powered from 12VAC DC mains adaptor e Automatically selects low power standby sleep mode e Current draw 120mA normal power mode 400mA when charging internal battery lt 350uA low power sleep mode Datataker 500 600 505 605 and Geologger 515 615 A 1 2Ah gel c
68. an Channel with Identification Text as a channel option e g 5V Thermopile O P Bar Graph Channel with Identification Text and bar graph channel options e g 3 L ND NR NL BG0 100 Low Fuel High where channel 3 is a 4 to 20mA loop returning reading between 0 and 100 Note that the Identification Text is used as a scale label and the NR and NL options ensure that it is used for no other purpose This example also shows how the multiple report facility the two option lists can be used to separate report and display functions You can use bar graphs in alarms Default Alarm Display The alarm state is indicated by ON i to the top status screen Identification A Oven Temp High Alarm with Text 120 6 C Text is displayed in the OFF state and Scrolling down below the last data channel or alarm moves ALARM7 4TT Oven OK gt 107 Oven Temp High Action Text displayed in the ON state e g COMMS Port let s talk Introduction All Datataker models have a 9 pin female DEQ connector for RS232 or RS423 communications to a computer This interface referred to as the COMMS port is the means by which you program the Datataker or a network of Datatakers from a host computer The COMMS port of all models of the Datataker is electrically isolated Refer to the Appendix for details of the COMMS port of your Datataker COMMS Port Parameters The COMMS port parameters are fixed except for the baud rate as fo
69. and ROM version The line of switches indicates the current switch settings see Switches on page 11 Use the u switch to make STATUS results less verbose The remaining lines are described below Each STATUS line can be returned individually STATUSn where n is the line number STATUS2 3 4 and 8 return extra information There are also other status levels that are not returned by the general STATUS command OMONONAKWN 5 Page 10 STATUS2 returns the scan schedules A none Scan Schedules Active Halted RA15M 1TT Room Temp If a memory card containing data is present then the schedules returned are appropriate to the card s data The X schedule is not given an active or halted state Note For this status report the schedules are simply stored as text in a buffer of 512 bytes If your program exceeds 512 characters the remaining program text is not returned and is replaced by three periods STATUS3 returns alarms without channel options The keyword alarm is in lower case if the alarm is halted by the HZn command see page 9 2 1 Alarms Active Halted RZ5S ALARM1 3V gt 105 1DS0 ALARMR2 4V lt 75 2DSO 1DSO 0 alarmr3 5TT lt 72 0 3DS STATUS4 returns defined polynomials and spans 2 Polynomials Spans Defined Y1 3 54 1 009 Deg C 7 0 0 100 0 0 1 0 KPa STATUS5 STATUS6 STATUS7 returns the data logging status and the data stored and free in the internal memory and card memory respectively
70. aracter is a Channel List For example 1 5V 6TK Boiler Temp 1DSO 1 where 1 5V is a voltage channel sequence 1 through 5 inclusive 6TK is a type K thermocouple channel named Boiler Temp and 1DSO 1 sets digital output channel 1 ON Channels are processed left to right Triggered Schedules Triggered schedules begin with the schedule identifiers RA RB RC or RD They scan their channel lists at intervals and times determined by the trigger see left Polled Schedule Channels entered in the RX schedule are scanned and reported only when the host computer or an ALARM see Action Commands on page 9 issues the X command The RX schedule will not accept a trigger Entering Schedules secin amp eno The reporting schedules RA RB RC RD and RX must be entered as a group If extending over more than one line they must be between the keywords BEGIN and END as in BEGIN RA10S 4TT Oven Temp 5TK Flue Temp RB1S_ 1C Gas Flow 2C Water Flow END Each line can be up to 254 characters long Channels on lines without a schedule header are included in the previous schedule A carriage return must terminate each line and separate last channel definition and next schedule header When the BEGIN keyword is received then all schedules including alarms are Halted and previous RA RB RC RD and RX schedules are deleted unless data logging is enabled see Data Logging on page 8 the scan schedules are locked se
71. are regression Various statistical programs are available for this purpose Some nonlinear sensors are supplied with their calibration polynomial A single Polynomial definition may be applied to any number of channels in any schedules or alarms Channel Variables nCV Channel Variables are floating point data registers The Datataker has 100 Channel Variables identified as 1CV to 100CV which can store channel readings and the result of expressions Channel Variables can be used within expressions see Calculations below and can be included in schedules to return store and display their current values Channel Variables are assigned the current value of any input channel by including the Channel Variable in a channel option list For example 1V 2CV returns the voltage for channel 1 AND stores overwrites the value into the channel variable 2CV You can also use one of four basic arithmetic operations and when storing input channel data into channel variables For example 5V 1CV scans channel 5V sets 1CV 1CV 5V reports the value of 5V 5V S1 1CV scans channel 5V applies span 1 S1 sets 1CV 1CV 5V S1 reports the value of 5V S1 The assignments are made at the report time of the embracing RA RB RC RD RX schedule Channel Variable assignments are not made at the Statistical Sub schedule scan time When a Channel Variable is included as a channel option for a statistically scanned
72. as possible default RZnS seconds RZnM minutes where nis an integer RZnH hours in range 1 to 65535 RZnD days RZnE event on either transition i RZE event on positive transition paan S RZE event on negative transition m ga RZnC count counter event after count onan RZnHSC event on any HSC counts number HZ GZ Halt and Go for all Alarm scanning HZn GZn Disable and enable Alarm number n Note an Alarm disabled by an HZn command will not be enabled by the global GZ command Only the GZn command will re enable individually disabled alarms and then only if alarm scanning is enabled GZ The Listing of Alarms The STATUS3 command see page 10 returns a list of all defined alarms The keyword ALARM is in upper case for enabled alarms and in lower case for disabled alarms Channels in the alarm list do not show their channel options Erasing Alarms Erase all defined Alarms with the CALARMS command and erase individual alarms with the CALARMn command where n is the Alarm number Polling Alarm Data Return the most recent data from the Alarm input channel to the host by using the Alarm query command n returns Alarm number ndata ALL returns data for all defined Alarms The data format is the same as for channel data except that the channel number is replaced by the Alarm Number For example 5 will return A5 123 4 Deg C ALARM5 4 L S3 lt gt 110 0 150 0 10S 1DSO 4DSO Boiler Temp RA2S Alarm Number The Alarm Number ide
73. as where wide temperature variations are possible Use a sealed case and include sachets of silica jell to avoid problems If your Datataker becomes wet immediately disconnect the power and batteries and dry the logger in a warm place If the Datataker has come into contact with salt water rinse thoroughly in fresh water then distilled water then dry Salt must not be allowed to remain on the circuit boards The Datataker will operate over a wide temperature range however the accuracy can be reduced While the electrical zero is stable with temperature the scale factor can drift slightly Endeavour to minimise the Datataker s exposure to temperature extremes Operating Scenarios You can deploy the Datataker in many ways depending on factors such as location data volume power availability on line to a host computer with Datataker as a front end periodic down loading to an on line host periodic down loading to a portable computer periodic down loading via modem to a host initiated either by the host computer or by the Datataker data recovery and programming using the removable memory cards The method of deployment influences the fine tuning of the Datataker s program As a general rule it is better to recover data as often as reasonably possible In this way sensor failures program faults etc will be detected earlier Page 2 Channel Setup first check the sensors 2TT a channel in this case channel 2 a
74. asure small changes in resistances They are particularly useful when applied to strain gauges as found in pressure sensors and load cells Four elements connected in a circular fashion Excitation Arms of the bridge may be active sensors or passive for bridge completion and nulling Common Mode Rejection Ratio CMRR a measure of the influence of common mode voltage on the output of the instrumentation amplifier Vom CMRR 20 log Vout x Av where Vem is an applied common mode voltage Vout is the resulting output voltage Av _ is the amplifier s voltage gain Common Mode Voltage is the average of the voltages between the measurement system s ground and the two input terminals Vin v v T Vil V2 Vout Vom V V2 2 Ground The term only has meaning for differential inputs Data Acquisition the process of scanning a range of analog and digital channels converting to digital format and forwarding to a host system Data Logging is a data acquisition system with on board data storage facilities Datataker the best little data logger in the world First appeared in 1983 as the Datataker DT100 then the DT200 in 1987 and the current generation of DT500 DT600 and DT50 s in 1990 Differential Input the two wire input is not referenced to a system ground and is essentially floating Vn Won ee Be Ground The common mode range limits must considered Ground Loop more often that not
75. ataker only responds to upper case characters except for the Switch command see Switches on page 11 Use lower case characters to document and add clarity to commands For example Time is the same as T and Report_schedule_A_every_15 Minutes is the same as RA15M using the underscore character to improve the readability as a space character is a command separator If communication is not successful check the COMS cable and COMS port parameters Change the Datataker s DIP switches see the Appendix for your Datataker or the computer s parameters so that both are the same Successful Data Logging Data logging is an orderly process and should be undertaken in a systematic way Clearly define the purpose for data logging so that the data you collect maximises the knowledge gained Consider the following identify the parameters to be measured select sensors and number of channels determine sensor output scaling determine how data is to be processed and reported decide on sample frequency minimise redundancy calculate volume of data to be collected decide method of data recovery and archiving consider power consumption When you have defined the task you can connect sensors and program the Datataker Sensor Connection pages 4 19 20 You must know the output signal for each sensor Make sure that the input to the Datataker does not exceed ratings As a general rule the voltage on any analog input terminal
76. bsequent sets of channel options generate additional reports This is particularly useful for statistical reports see Schedules on page 3 and display formatting see Channel Options on page 5 The first channel option set determines how the channel is sampled and must include all sampling options required for the channel These channel options are listed above the Config Line in the Channel Options table on page 5 If KO D statistical options are included amp D then each option list in the Oy Px multiple report MUST hold a c statistical option amp fe lt 1 2 3 4 5 6 Common mode range 3 5V 1 2 3 4 5 6 Common mode range 100V DT505 515 605 615 only 7 8 8a The internal 100 0Q shunts are between Return and 7 8 8a Ground Terminals eg 3 1 5 L S2 9 10 11 12 Four wire configuration requires 4W option 13 14 15 Four wire full bridge use 4W option see Bridges page 17 16 17 External completion required for 1 2 amp 1 4 bridges 1 2 3 4 5 6 0 102Hz to 20kHz use 2V option for 0 5 volt single 1 2 3 4 5 6 ended inputs but for low level 100mV input to 300kHz Geologger DT515 and DT615 models only See Time and Date sections on page 6 internal Increment every sec 1ST min 2ST hr 3ST day 4ST 1 2 3 4 5 See Thermocouples on page 16 9 10 11 12 Three wire is the default connection see RTDs 9 10 11 12 on page 16 however a 4 wire connect
77. cant bit in a byte Multiplexer is a device used to increase the number of channels by sequentially routing multiple channels to a single signal processing system Phase Encoder a position sensor with two digital output lines with a quadrature phase relationship that provide distance and direction information 3D I Li Ls 4 aT Td LS count Z The Datataker uses an up down counter to provide the position indication PID Proportional Integral Derivative A three mode control algorithm commonly used in industrial control A PID loop with two state output can be programmed on the Datataker using the difference integration and calculation facilities Port a communications connector on a computer or other device RAM Random Access Memory Memory that allows data to be read or written at a particular location without having to pass sequentially through preceding locations ROM Read Only Memory Memory that can be randomly read but not written Settling Time The time allowed for an input signal to stabilise after selection and gain changing See P10 on page 10 and 7SV on page 6 Single ended Input the input is referenced to a system ground or other signal common Avex Vin Ground In a multi channel system only one input terminal is needed in addition to the shared common terminal RTD Resistance Temperature Detector A resistive sensor that changes resistance with changes in tempe
78. channel the statistical result is stored in the Channel Variable and not the individual readings For example the program RS5S RA10M 3V AV 1CV MX 2CV MN 3CV will store the 10 minute average maximum and minimum into Channel Variables 1CV 2CV and 3CV respectively Channel variables can also be assigned the results of expressions see Calculations below For example 3CV 1 COS 2CV 1 141 evaluates the expression and assigns the result to 3CV Using Channel Variables Channel Variables are used in the same way as input channels within schedules and alarms Channel options can be used to modify the function and data format of Channel Variables For example 5CV BG 5 0 5 0 NL NR 6CV 7CV assigns to 5CV the sum of 6CV 7CV and displays the result as a bar graph BG Data is not logged or returned Channel Variables are not normally returned with units text however you can define units using polynomials Y20 0 1 0 KPa 11CV Y20 SQRT 4CV 6CV Channel Variables can be used in alarms both as the test value and as the setpoint s For example ALARM1 4CV lt gt 2CV 3CV 5CV 20 Channel Variables are useful when comparing an input channel against several thresholds For example 1F1 1V 1CV gt 0 5 Over 0 5 Volts IF2 1CV gt 0 6 Over 0 6 Volts 1F3 1CV gt 0 7 Over 0 7 Volts where channel 1V is sampled once rather than risking different values and tested against a number of setpoints Where statistical re
79. cy hum then noise pick is a problem If the gauge is placed near a transformer electric motor high current power cables etc either re site or orientate gauge for minimum pickup Ensure cable is shielded to prevent capacitive pickup Measure Resistance Gauge and cable integrity is best determined by measuring the circuit resistance This can be done using a multimeter or the Geologger see Resistance on page 4 This resistance should be stable and not drift with time Measurement Delay nFW 200 If returned data is unstable to the extent that it varies by perhaps 20Hz yet the speaker indicates a strong signal the signal may contain harmonics The harmonics generally decay more rapidly than the fundamental so increasing the time between stimulation and frequency measurement can improve the results The measurement delay can be adjusted by setting the channel factor in milliseconds see Channel Options on page 5 For example 1FW 500 will increase the delay from the default 200mS to 500mS ExtraSamples nFW ES9 By default the Geologger measures a vibrating wire frequency over a period of 10 line periods 167mS in 60Hz countries and 200mS in 50Hz countries This has been found optimal for most gauge types However for gauges with a rapid signal decay this period can be reduced so that the measurement window does not extend into the noise For example 1FW ES4 100 will allow sampling over 5 line periods and reduce the measurem
80. d see list on page 23 System Variables nSV System Variables provide various system values These are used in the same way as channels See page 5 1SV Data points free in internal memory 2SV Data points stored in internal memory 3SV Data points free in card memory 4SV Data points stored in card memory 5SV Number of statistical scans in last schedule 6SV Number of remote network errors also P9 7SV ADC settling time in mS P10 defaults to 10mS 8SV Mains frequency in Hz P11 defaults to 50 60Hz 9SV_ 1 if memory card inserted 0 if card not inserted 10SV_ Returns the schedule ID from which it is returned 0 for RX poll by host 4 for RD schedule 1 for RA schedule 5 for Immediate scan 2 for RB schedule 6 for RZ alarm schedule 3 for RC schedule 11SV Returns 0 0 useful as a reference channel 12SV Decimal day time e g 56 5 is midday of day 56 Use formatting for more precision e g 12SV FF4 13SV Returns the logger s address 14SV System attenuation factor default 214 61 15SV Returns date as day number of the current year Note System Variables normally have no decimal places Use the FFn option to increase the resolution Values or expressions can be assigned to the System Variables 7SV and 8SV For example 7SV 15 which sets the ADC settling time to 15mS see ADC Details on page 18 for more information Assignments to 7SV and 8SV can be within a schedule and the assignment is executed each time t
81. d be 1 and 50 ppm or better YSI Incorporated Yellow Springs Ohio 45387 USA Fax 513 767 9353 The Alpha is defined by R100 Ro oox Rg 7S where RO and R100 are the resistances at 0 and 100 The three RTD channel types are connected as for a resistance The 0T resistance is assumed to be 100Q for platinum and 1000Q for nickel types Other values can be specified as a channel option The default connection is for a 3 wire measurement but 4 wire can be specified as a channel option for greater accuracy For example PT385 4W 50 0 will read a 4 wire 50Q at 0C device Sensors 2 understanding helps Ground Loops Ground loops are a common cause of many measurement problems including noise offsets and erratic behaviour Ground loops occur when a circular conduction path is established between grounds in a system The use of differential inputs instead of single ended inputs overcomes most ground loop problems Fundamental to the condition is the incorrect assumption that there is a single ground potential in a measurement system In practice two grounds in a system are rarely at the same potential The result is that ground currents are very common and if allowed to flow through the sensor wiring then measurement errors are inevitable The communications cable often creates a ground loop If disconnecting the COMS cable has an effect on logged data this suggests a poor wiring arrangement Is
82. e F on page 11 or the memory contains data The BEGIN END construct may contain blank lines and any other of the Datataker commands these are executed on entry When the END is received the original Halt Go state is restored You cannot append additional channels to a schedule once it has been entered Instead you must re enter the full set of schedules including the additional channels Immediate Scans A channel list with no schedule ID or trigger is scanned once immediately The channel list can be scanned again by the asterisk command Immediate scans are not logged Note An immediate scan should be given time to execute before a BEGIN command is issued If this is not done the immediate scan s data may not be returned If requests for immediate scans are too rapid then the channels may be appended as if they were part of a single channel list Setting P22 13 can overcome this by ensuring a return character is placed after each reading Schedule B Statistical Sub schedule Channels can be read frequently to produce a statistical data summary at longer intervals This summary is returned logged and displayed at intervals determined by RA RB RC RD or RX schedules The statistical scan is a sub schedule Channels that require statistical scanning must include a channel option to indicate the statistical information required see Channel Options on page 5 and Statistical Channels on page 6 If more than one
83. e RA5S which is to report every five seconds RA5S the temperatures on five Type J thermocouples 1 5TJ and to log or store the results in memory LOGON Programs are executed only after the receipt of a carriage return character Recovering the logged data is even simpler U return returns the data in the default format 1TJ 384 7 Deg C 2TJ 335 2 Deg C 3TJ 367 1 Deg C etc If you want to do more complex tasks you ll need to learn about the Datataker commands You can be sure that the Datataker has the flexibility to handle very complex situations once you become familiar with the full command set The more familiar you are with the Datataker s features the better you ll be able to use it Explore in detail the features that are of most interest First Time The Getting Started with Datataker User s Guide included with your logger is recommended reading for first time users The manual will quickly teach you how to program the Datataker Alternatively you may read on The first task in preparing the Datataker is to establish a communications link with your computer Connect the communications cable supplied between the Datataker and to any IBM or compatible computer Load and run either DeTerminal for DOS or DeTerminal for Windows which will configure your computer s RS232 port COM1 by default to match the Datataker s communications parameters These programs also provide a terminal type interface for programming the
84. e 2 500mA constant current source resulting in readings independent of lead length resistance This arrangement has a sensitivity of approximately 1 ppm per active arm Full Bridge Constant Current Excitation Analog Input Configurations 2 Bridge Supply 7 x2 Reference channel e g 3V BR N Measurement channel e g 5BGV N 2BGV 108 Ground The external bridge supply should not exceed 2 5V unless the reference channel input is attenuated The difference between six and four wire connection is the location of the reference channel measurement point at the bridge or at the logger Six amp Four Wire Ratiometric Bridge Input Reference channel e g 1V BR 2 Ground Measurement channels e g BGV N X 23 34 BGV N X This is a combination of Config 1 for the reference channel and Config 3 for measurement channels The half bridge completion resistors Rc are best located near the active bridge arms however they can be located at the logger Half and Quarter Bridge Ratiometric Input with Shared Half Bridge Completion Config 18 Examples 2 AD590 2 V Bottom view of v metal can version Note Sensor power can be any 4 to 12 volt source The above arrangement is equivalent to Config 7 Differential and single ended wiring Config s 1 amp 2 with external shunts may be used AD590 Temperature Input Examples 2LM335 2 LM335 2V 2 V optional potentiometer
85. e Excitation The Datataker can measure the excitation voltage at the bridge and compensate numerically for the voltage loss This requires a six wire connection see wiring configs 16 Hints for Successful Measurement is not an effective counter measure The only practical measures are to avoid magnetic fields and to use close twisted conductors for the signal wiring Shielding in steel pipe can be effective but is generally not economic or convenient The influence of noise can be minimised using the ESn channel option see Extra Samples on page 5 and averaging see Statistical Channels on page 6 Self Heating of Sensors Sensors that need excitation power to be read are heated by power dissipation This can be particularly acute with temperature sensors and some sensitive bridges Minimise error by minimising the excitation power exciting only when needed by using the excite terminal or by calibrating out steady state errors Accuracy The basic accuracy of the Datataker is 0 1 of reading not full scale plus a small offset error 4uV 40uV and 400pV for each voltage measurement range at 25 The temperature coefficient for the scale factor is 20ppm T max Any one of the three basic ranges may be trimmed to 0 003 by trim pot or P1 The Datataker self calibrates its measurement circuits whenever its input voltage offset drifts by more than a value set by PO in microvolts defaults to 4uV The calibration procedure empl
86. e Shooting By design most vibrating wire gauges are very reliable If a gauge fails to return sensible results it can be due to an open circuit a short circuit e excessive cable leakage e very high induced common mode noise levels direct noise pick up by gauge coil failed gauge excessive cable length for gauge sensitivity inappropriate use of single ended input gauge frequency outside 500Hz to 5KHz range mechanical vibration of gage by external forces The Speaker V v The Geologger has a built in speaker and headphone jack 3 5mm mono or stereo 8Q specifically for fault diagnosis The speaker is enabled by the V switch see Switches on page 11 The speaker is connected to the high gain amplifiers output Note that the frequency response of the small speaker is far from flat the use of headphones is preferred For a good gauge and correct installation the sound is a clean ping decaying over a period of a few seconds Note the full decay can only be heard for the last channel in a channel list Embedded channels can be heard but only for about half a second If there is no tone but only noise check the channel type wiring and resistance below If a note can be heard but it is faint or buried in the noise then the cable is too long or leaky or the gauge insensitive If the note is not clean and pure then the gauge is suspect It may have been damaged during installation If you can hear a low frequen
87. e is dependent on the Datataker model e Sensor excitation of 4 5V 250 0uA 2 500mA each channel e Provision for externally supplied sensor excitation e Sensor support is dependent on the Datataker model e Local internal temperature sensor monitors CEM temperature for thermocouple reference junction compensation Digital Channels Digital Inputs 20 TTL CMOS compatible digital inputs for digital state and digital byte the digital inputs do not count e Accept voltage free contact closure inputs Digital Outputs 5 normally open relay outputs rated to 110VAC DC at 5A 5 open collector outputs rated to 30VDC 200mA Power Supply Powered directly from the Datataker power supply Enters low power mode sleeps when Datataker sleeps e Current draw 100A when asleep 60mA when scanning 175mA when all output relays activated Connection to the Datataker One or two modules can be daisy chained to a single Datataker e Interconnection by screened cable 500mm 20 inches length Maximum total cable length 2 metres 6 feet Mechanical Specification e Robust modular construction using powder coated steel e Can be used directly or housed in fixed or portable enclosures Length 270mm 10 5 inches width 110mm 4 3 inches height 50mm 2 0 inches weight 1 0kg e Signal input output connection by screw terminals Operating temperature 20 to 70 Deg C humidity 95 Page 33 Datataker Enclosures ae
88. e over environmental temperature range the channel is sampled This settling time can be Excite terminal may be used as a single ended input channel Not available on DT50 J changed by 7SV and P10 see pages 6 and 11 e g 0 V M18 156 101 0 returns battery voltage and 0 I M17 188 0 22 returns battery current positive indicates charging negative discharging Allows addition sequential samples to be taken at scan time and averages the results Results in reduced noise and increased resolution Valid only for counters system timers variables e g nNCV R and for pulsing digital outputs e g 1DSO 1000 R 1 pulses output on for 1000mS Generally a scale factor specific to channel type see Channel Factor column on page 4 Applies a previously defined polynomial of form Yn a b c d f g text see Polynomials on page 7 Applies a previously defined span of form Sn physical low physical upper signal lower signal upper text see Spans on page 7 1 1 x 2 x 3 Ln x 4 Log x 5 Absolute x 6 x 2 7 Grey code to binary conversion 8 bit Returns the difference between latest reading and the previous reading These options cannot be used directly in alarms The channel must Rate of change based on latest and previous readings and their respective times be included in a scan schedule where the channel value is assigned Useful when the sensor reading is already a difference e g resetting counters f toa variable which ca
89. e to be scanned Plan your program to ensure that the Datataker does not wake more often than is necessary This particularly applies to the Statistical Sub schedules see page 3 and Alarms see page 9 Data Logging pases The Datataker stores data internally 13 650 readings and in a Memory Card up to 340 000 readings The internal memory acts as a buffer for the Memory Card so that data is not lost during card changes By default the Datataker stops logging when both memories are full An overwrite mode allows continued logging with the oldest data being overwritten by new readings See Data Logging and Retrieval on page 8 and Switches O on page 11 You can selectively log channels see Channel Options Output format on page 5 Logging begins only after you issue the LOGON command Time and date stamping is automatic The Datataker does everything possible to avoid data loss caused by careless use However it does respond to the RESET CLEAR CLAST CTEST and CDATA commands which will erase data from memory without question Be very careful Data Retrieval page 8 Data stored in the internal memory or in a Memory Card is retrieved via the COMS or Network ports You can retrieve data for an individual schedule or for all schedules merged The Operating Environment The Datataker is an electronic instrument Electronics and water do not mix Condensation can be a serious problem in the tropics and in cooler are
90. e used as a programmable prescaler The counters have a settable range count after which D3 etc They increment on negative going transitions The or frequency divider mode 3 pulse generator mode 0 or they reset to zero The range is set as a channel option and digital inputs are sampled to detect transitions at a rate even a crude analog output mode 2 with low pass filter has a maximum value of 65 535 For example 1C 3 sets determined by P13 The default is once every 50mS but the Note using high speed counter output interferes with the the range of low speed counter one to 3 On the third input allowable range is 10mS to 100mS If the value of P13 is set operation of the counter as a counter pulse the counter will be reset to zero towards the lower end of the range the Datataker can The high speed counter output is set up by Input pulseno 0 123 45 6789 10 11 become slow in executing other tasks 1HSCO mode N 12 9 i The shortest pulse that can be counted reliably is equal r Counter reading 0 1 2 0 1 2 01 2 9 to the P13 value in milliseconds Shorter pulses are not Where mode is the counter mode and N is the counter The resetting channel option R may be used with counted reliably Being software counters low speed ange a constant or expression The following timing counters This will cause the counter to be reset to zero counters only operate while the Datataker is awake diagram shows how the output is dependent on the mode
91. ed data into memory or data logging is enabled by LOGON or schedules are locked by F then the Datataker will issue the error message E4 or E48 see page 21 You cannot erase individual schedules Channel Types how to specify channels Introduction All analog and digital channels on the Datataker are multipurpose The channel specification determines internal signal and excitation routing sampling method and data processing A channel is defined by its channel number channel type and possibly one or more channel options Channel Number Each input and output channel has a channel number Each single ended analog input has a suffix label corresponding to a screw terminal Excite output or positive single ended input terminal Positive differential or positive single ended input terminal Negative differential or positive single ended input terminal Return common or single ended current input terminal Thus 5V defines a differential input between the and terminals while 5 V 5 V and 5 V defines single ended inputs between the or terminals respectively and the R terminal Similarly 5 l defines a single ended current input between the R terminal and a GND ground terminal The DT50 does not support the excite terminal as a single ended input Two channel numbers separated by two or more points ie defines a continuous sequence of channels If the first label indicates a s
92. ed to XON P26 0 disables timeout and P26 255 ignores received XOFFs Parameters are not the same as P30 Number of alarms permitted count 20 Oto 110 Number of alarms that can be entered Must be set before any schedules or alarms are entered see Introduction on page 9 channels or variables If you include a parameter in a schedule it does not become part of the schedule Instead it is processed immediately You can set or read parameters from the host computer from a memory card program or from Alarm Actions P31 Date format mode 1or2 Oto2 0 day number 1 dd mm yy European 2 mm dd yy N American see Date on page 6 for default value P32 Number of significant digits digits 5 1to9 Sets significant digits of output data Note logged data is always stored to 5 digits so P32 gt 5 is only useful for realtime data P33 Field width characters 0 variable 0 to 200 If P33 gt 0 this defines fixed field width for all output data right justified space padded or least significant digits truncated P36 Temperature units mode 0 T 0to3 0 T 1 2 3 R Datais converted before being placed into store and cannot be converted at Unload time P38 Decimal point character ASCII 46 0 to 127 The character used as a decimal point in floating point numbers see Output Format on page 10 P39 Time format mode 0 hh mm ss O0to2 0 hh mm ss 1 seconds 2 decimal hours hh hhhh see Time on page 6 P40 Time separator ASCII 1 ASCII charact
93. ed with care when controlling branching or alternative processing two alarms are required the alarm schedule scan rate must be the same as any other schedules which use the result e the alarms are executed after other schedules and so the result will not be available until the next scan of the other schedules e the standard alarms e g ALARM2 or IF2 execute the action commands each time that the alarm becomes true and not while the alarm remains true the repeat alarm e g ALARMR2 or IFR2 continues to execute the action commands while the alarm is true Alarms can also be used to activate scan schedules if test conditions are true For example the RX schedule can be activated to log data if one of the temperatures exceeds a threshold as follows RX 1 2TK 40mS overhead per scan fixed 5mS overhead in channel selection fixed 2mS data return to host per chn Ir Counters 01065535 and back KIERTO TK gt 100 0 OR The Datataker has two types of 16 bit counters lw Low Speed Counters nc High Speed Counter Output 1HSCO moce ia speed nC channel type and high speed nHSC channel The low speed counters are software counters that High speed counter one has an output terminal that type Both counter types behave in a similar way share input terminals with the digital inputs labelled D1 D2 allows the counter to b
94. edule A good choice would be 1 V M18 156 W Page 28 Power Consumption The Expansion Module will consume very little power if Current Condition the Datataker to which it is attached is allowed to sleep SEEP mo tdimaivS onka While scanning channels on the expander the current drawn ai no it m igita i from the Datataker will increase to 60mA Additional current igital inputs grounde a scanning module s channels 60mA is required if the digital output relays are switched on Each of the five relays will draw 35mA however these relays are automatically switched off when the Datataker sleeps A summary of current draw is tabulated to the right relay outputs set 1 5DSO 1 worst case maximum 175mA 240mA Module Module Module Digital Digital Output L Relay O Input Output Terminal Ground Ground Pair Digital Inputs 1 to 20 Digital Outputs 6 to 10 Digital Outputs 1 to 5 270 mm a I AN I 950 mm Digital Output Channels y Digital Input Channels Y A a ego RATS TaN rrot Dia EA B ER OO a het leles SISSSHSPPSpssspsysspssepssssppesp Expansion connector Expansion connector 3 pi a to previous module or to next module Datataker 110 mm OO OO 75mm i o Ie aS Vik 2 R 3 R 4 R 5 R k 6 R 7 R 8 R 9 R 10 rR QE y Ae Ex Analog Input Channels f Analog Channels h Ground Terminals Externa
95. ell battery is installed in the logger chassis and is recharged whenever external power is available All Models e An external 6V gel cell battery can be connected to the logger and is recharged whenever external power is available e A 9V alkaline battery pack can be used to power the loggers Page 32 Battery Life Sampling 10 1 2Ah Gel Cell 17 Ah Alkaline channels every Battery Battery Continuously 5 hours 3 days 1 minute 12 days 160 days 15 minutes 60 days 800 days 1 hour 90 days 900 days Mechanical Specification e Robust modular construction using powder coated steel e Can be used directly or housed in fixed or portable enclosures e Signal input output connection by screw terminals Operating temperature 20 to 70 C humidity 95 LCD display 5 to 65 C Datataker 50 Length 270mm 10 5 inches Width 110mm 4 3 inches e Height 50mm 2 0 inches with no memory card inserted e Height 105mm 4 2 inches with a memory card inserted e Weight 1 5kg Datataker 500 600 505 605 and Geologger 515 615 Length 270mm 10 5 inches Width 110mm 4 3 inches e Height 85mm 3 3 inches with no memory card inserted e Height 105mm 4 2 inches with a memory card inserted e Weight 2 4kg Accessories Included e 110 240VAC mains line power adaptor RS232 communications cable for IBM and compatibles e Getting Started Manual and User s Manual DeTerminal for Windows DeTerminal for DOS and DeLog
96. emote Modem has a dumb mode use it This mode is manufacturer specific and usually means that the modem is preconfigured to a known state and will not respond to commands Consult the modem s manual for details Modem DCE Cable Frame Ground Yell nan ellow TxD Blue Green eno RTS CTS Modem DCD DCE DTR D DB25 Male Shield Datataker DE9 Male Networking distributed processing Introduction Datataker models with an RS485 network port can be connected in a local area network LAN with up to to 32 Datatakers A total of 1000 meters of cable is allowed in the network The proprietary network protocol has error detection and correction and operates at 1200 baud over a single twisted pair of polarised wires Datatakers are wired in parallel so that all NET screw terminals are connected to one wire and all NET screw terminals are connected to the second wire Ideally the network cable should have a shield that is grounded at a single point Network a Twisted Pair of Wires note polarity Local Logger RS232 or RS423 interface The host computer may be connected to any of the Datatakers referred to as the local logger in the network through its COMS port Data is returned to the COMS port of the local logger P21 will allow this return address to be over ridden see Parameters on page 11 You can connect host computers to different Datatakers in a net
97. emperature T of the calibration AT T Tp All temperatures must be of the same units C 1 Example For the AD590 sensor the channel factor represents the value of the series resistor used to measure the output current the default value is 100 0Q Without changing the actual resistor this channel factor is adjusted If the temperature error is determined to be 1 7 higher than actual at 100 C the channel factor correction is hi lfi Rx 1 gt Channel factor x TT Y 17 100x 1 700 273157 99 544 The correction can be applied e g 5AD590 99 544 Analog Devices National Semiconductor Corp their resistance will change by 2 To convert the Datataker s ppm bridge readings to strain use the following formula 2 HS k Bout where k GN and S is micro strain Bout is the Datataker s bridge channel BGV or BGI result G is the Gauge Factor and N is the number of active gauges in the bridge The conversion can be done in the Datataker by applying a polynomial see page 7 as a channel option Y1 0 k uStrain Polynomial definition 2V BR Reference Vex channel 3BGV Y1 Bridge channel where kis defined above The following table indicates the Datataker performance for different bridge inputs Arrangement Excitation Gauge Resolution Range BGV full bridge quarter bridge BGI full Bridge quarter bridge BGI full Bridge quarter bridge 12 500 50 000 4 300 17 000 Note Exceed
98. en each option list must contain a statistical option For example 4PT385 1 500 AV MX TMX MN TMN Note the first option list 1 500 AV must include all of the options required for managing and sampling the channel This rule applies to any options above the Config Line in the Channel Options table page 5 because the channel is sampled and scaled according to the first option list Statistical results are tested in alarms by first assigning them to Channel Variables see page 7 Average AV The average or mean is the sum of all the channel readings divided by the number of readings It is very useful in reducing sensor noise Standard Deviation SD The standard deviation is a measure of the variability of the data about the average or mean The variation may be due to electrical noise or process changes The units of standard deviation are the same as the channel reading Maximum and Minimum Maximum and minimum of a set of channel readings can be reported with the MX and MN options Similarly the time and date of these can be reported with the TMX TMN DMX and DMN options Also see X switch on page 11 Statistical Operations great for reducing data Integration INT The integration option returns the integral or area under the curve with respect to time in seconds using a trapezoidal approximation The units of an integration are those of the original reading multiplied by seconds When applied
99. ent or voltage Special Resetting to zero Scaling Data manipulation cannot be used in Alarms Reference channel not logged or displayed Statistical cannot be used in Alarms Variables Output format Mx y all above ESn R tf Yn Sn Fn DF RC RS IB TR TZ BR AV SD MX MN TMX TMN DMX DMN INT Hx y n mCV nCV nCV nCV nCV l nCV FFn FEn FMn text NR NL ND w BGx y a A M U a ee a Options grouped by a bar are mutually exclusive If more than one of a mutual exclusion group is placed in a channel list then only the last is applied Terminates inputs with 1MQ to ground Un terminates inputs Configures input for a 4 wire measurement Use SE Ref terminal as common Use internal 2 500 Vref as common Gain Lock Attenuation No Attenuation Guard signal Voltage source approx 4 5V via 1KQ Current source 250 0pA Current source 2 500mA Open circuit excite terminal no excitation Special input signal routing Extra samples Reset counter timer variable after reading Channel factor Polynomial Span Intrinsic functions Difference Ax current previous reading Rate of change per second Ax At Reading time difference in seconds x At Integrate x_units seconds x Ax 2 At Thermocouple reference temperature Thermocouple reference zero channel Bridge excitation voltage channel Average of channel readings Standard deviation
100. ent bridge with an arm resistance of 120 ohms For the half bridge two resistors are external and the bridge completion is internal to the Datataker The Introduction Integrated Circuit IC temperature sensors are devices that are constructed on small silicon chips These are linear sensitive and available in both voltage and current output configurations They share the thermistor s disadvantage of limited temperature range generally 40 to 150 and self heating from power dissipation caused by the excitation current needed to read the sensor Datataker supports the four most commonly available IC sensor types Sensor Output Channel Type Wiring Config AD590 1pA K nAD590 18 7 8 amp AD592 LM34 10mV F nLM34 20 21 1 2 3 LM35 10mV T nLM35 20 21 1 2 3 LM335 10mV nLM335 19 4 5 6 Calibration IC temperature sensors have different calibration grades The lowest grades typically have an error of up to 4 2T at 25 More expensive sensors have an error of 0 25T This error is a combination of an offset or zero error and a slope error The Datataker provides a slope or scale correction capability on a per sensor basis using the channel factor See Channel Types on page 4 and Channel Options on page 5 Frequently a slope correction based on a single point calibration point is enough for reasonable accuracy The pivot point for the slope correction is dependent on the senso
101. ent delay to 100mS Page 27 Measuring Gauge Temperature Most vibrating wire gauges are sensitive to temperature fluctuations Where a gauge s temperature is likely to change significantly its temperature is usually measured The Geologger supports all sensor types normally used including Thermistors Yellow Springs 400XX series platinum nickel and copper RTDs See Channel Types on page 4 and RTDs on page 16 for more information Measuring Frequency and Temperature on one Channel Depending on the gauge wiring it is usually possible to measure the vibrating wire differentially and a resistance temperature sensor on a single channel Channel Terminals 1FW 1 YS04 Vibrating wire sensor with two wire RTD Temperature channel is read single endedly as for example 1 YS04 a YSI 44004 sensor see page 16 and the vibrating wire as 1FW Note the RTD sensor type must be of a relatively high resistance type say gt 1000 if errors due to cable resistance are to be avoided Similarly other configurations are possible If the temperature sensor is of a low resistance type then the following is recommended Channel Terminals 1 FW 1PT392 Single ended vibrating wire with three wire RTD However this configuration has the disadvantages of a single ended vibrating wire connection If the temperature sensor is of high resistance type then the following is preferred Channel Terminals 1FW 1 NI 2000
102. er as decimal number separator character for hh mm ss time format see Time on page 6 Switches uppercase ON lower case off z Introduction ISSN S Switches are analogous to electrical switches RS RS O A fe and are turned on by upper case and off by lower 9 S D Q G case Switches are internal system settings and A la Display alarms la Enable the display of displayable alarms see Displaying Alarms on page 12 generally global in effect Switch commands can Ic Ie Channel identification IC Channel type is included with channel number with returned data e g 5PT392 instead of 5 see Output Formats on page 10 be issued at any time and most take effect D ld Prefix date to data ld Prefix date to logged data equivalent to a D at beginning of a schedules channel list immediately Delay in effect may occur if data is E le Echo E Enables echo of commands to host Useful in terminal mode communications with the Datataker buffered in the Datataker or in the host computer IF f Fix schedules f Prevents a logger s scan schedules trigger or channel list being modified see Schedules on page 3 A RESET will still erase schedules s X E H h Formatted mode h Fixed format mode of data output Switches and Parameters are saved by H and restored by h See the Datataker Communications Manual Viewi ng Switch Settings IJ j Over range error carry IJ Errors are carried through expressions so t
103. er is in the sleep state The factory preset for these models is to power down the multiplexers in the sleep state The current saving is approximately 150A Refer to the Appendix for your Datataker for precise details The disadvantage of powering down the multiplexer is that it may cause problems with some sensors For inputs over about 0 5 volts the input impedance drops from tens of megohms to hundreds of ohms This may cause draw of current from sensors and possibly inject some of this current into other sensors Datatakers with relay multiplexers do not require these considerations since the relays are open circuit when off The Wake Terminal A low state less than 0 7 volts on the Wake Terminal will wake the logger within 300mS The signal can be generated by a relay closure or an open collector NPN transistor to ground The Wake signal line has an internal 18002 pull up resistor to 5 Volts and requires a signal level of less than 0 7 Volts A permanent low state on the wake terminal will not prevent short periods 100mS of sleep if there is no scheduled activity Only P15 2 keeps the Datataker permanently awake A Low Power Program You may find this framework useful when designing low power programs After RESETing the Datataker enter the following program P15 1 sleep if not busy P17 5 go to sleep quickly u n disable channel ID and units 1 0 100 0 1 RH define spans etc here BEGIN RS15M sca
104. er the data format can be condensed the to a form more useful for computers 1453 12 7500 2 490 395 0 3498 where the Switches are set to u n and the Parameters are set to P22 44 acomma P24 13 a return P31 0 day number and P39 2 decimal hours Data format control is global and is applied to real time data unloaded data and the data returned by the TEST and STATUS commands Note All data is kept internally as 3 byte data and is formatted when returned Data format can be changed between successive memory Unloads Data Numeric Format The numeric format of data is set for channels by channel options FFn Fixed point n number of decimal places n 0 7 FEn Exponential n number of significant digits n 0 7 FMn Mixed FF or FE formats Uses FE format if exponent is less than 4 or greater than n n 0 7 Examples of the numeric format channel options for returned data Default 23 456 23 5 2 346e1 0 025 0 0 2 542e 2 0 0 0 03 1034 6 1034 6 1 035e3 1e3 1034 64 Note that the default format depends on the channel type returning the data See the Channel Types table on page 4 especially the resolution column Formatting options are not applied to the 99999 9 error data code see Errors on page 20 Parameter P33 allows returned data to be in fixed fields All data is placed into fields of the same width defined by P33 by space padding to the left If the field width is not sufficie
105. erential Voltage Input 4 6 Attenuated Single Ended Voltage Input 5 Bridge 3 wire Half and Quarter 13 14 Bridge 4 wire Full Constant Current 15 Bridge 6 wire Full Voltage Excitation 16 17 Copper RTD 9 10 11 12 Counter Input Low Speed 22 Counter Input High Speed 22 Current Input with External Shunt 8 8a Current Input with Internal Shunt 7 Current Loop 4 20mA External Shunt 8 8a Current Loop 4 20mA Internal Shunt 7 Differential Voltage Input 1 4 Digital Input 22 Digital Input on an Analog Input 25 Digital Output 23 24 Frequency Input 1 2 3 4 5 6 25 Guard Screening 1 LED on Digital Output 24 LM34 LM35 20 LM335 19 Nickel RTD 9 10 11 12 Phase with AC Option 2 4 Phase Encoder 22 Platinum RTD 9 10 11 Potentiometer 13 Relay on Digital Output 24 Resistance Input 2 wire 11 12 Resistance Input 3 wire 10 Resistance Input 4 wire 9 Single Ended Voltage Input 2 4 Single Ended Voltage External Ref 3 5 Thermistor 9 10 11 12 Thermocouple 1 2 3 Fy Vibrating Wire Sensors 1 2 Voltage Input 1 2 3 4 5 6 Note the number references relate to the wiring configuration Error Messages nep Introduction The Datataker returns a message when it detects an error in a command an error in an input channel or an operational difficulty The form of the error report is controlled by the U switch The default is the verbose form shown in the table below If the sw
106. etitive scan schedules can include one or more channels Time based scanning in increments of 1 sec 1 min 1 hour 1 day e Event based scanning on digital channel events e Event based scanning on counter channel events Poll based scanning initiated by direct host requests e Conditional scanning when inputs exceed setpoint values Conditional scanning while any digital input is high Data Scaling Data read from the input channels in electrical units can be automatically scaled to engineering units All subsequent data manipulation is performed on this scaled data e Calibrations for individual sensors can be declared by up to 20 definable linear spans declared as span co ordinates up to 20 definable polynomials from 1st to 5th order mathematical expressions Data Manipulation Statistical data including average standard deviation minimum and maximum with date and time of min and max and integral Delta rate of delta differential and integral between scans e Histogram with definable number of classes e Expression evaluation using channel data and constants with arithmetic logical and relational operators log trig and other intrinsic functions Alarms Alarms for monitoring channels and variables for high and low alarm inside and outside of range alarm with definable setpoints Alarms can be combined by AND OR and XOR operators e Optional delay period before an out of range condition
107. f to enable changes E51 ALARM command error alarm number out of range defined by P30 setpoint character lt gt lt gt or gt lt missing AND OR XOR incorrectly entered setpoint not specified or too large delay incorrectly specified E52 alarm text memory full memory for storage of alarms text is filled cannot specify additional alarm strings E53 no statistical samples no statistical sample taken so cannot calculate statistical function E54 expression error syntax error expression too complex E55 expression memory full total expression s text gt 3847 characters reduce number of expressions E60 RAM n failure RAM number n has failed self test may cause strange behaviour and data loss e return logger for service E61 memory card failure replace battery replace card memory card is not serviceable Simplified Circuit the guts of the Datataker Sensor Excitation Selector Selection is generally automatic but can be forced by the 3 volts isi Two precision current Page 22 1 Il V or G channel options see page 5 ON 5 lt ___sources are available Internal battery 6 9V Regulator with temperature Input multiplexer CO 5 volt for resistance and On Some compensation to match the 2 5mA Il E w ys bridge measurements Power Supply models charging requirements of 6V Input c
108. g 12V excitation then the 12V would be Module is attached This ranges from 3 5V for the applied to the RTD when it is scanned The RTD would Datataker 500 and 600 models to 100V for the Datataker probably be damaged 505 and 605 and Datataker 515 and 615 models Page 29 Appendix Memory Card Processing Flow Chart Memory card inserted UNFORMATTED NEW NOTES CARD 1 Display of messages and sounding of beeper only occur on Datatakers fitted with a keypad display unit for example DT600 DT605 DT615 and Panel Mount Display Format card s FORMATTED 2 If the write protect switch is set to Display card ID ca TEARD Write Enabled and writing appending Card ID is data and or Beep once and display Display card ID to the card is allowed then any Boiler Room program TETEA internal data will be transferred to the and beep once Ree CAE ER SE sagan ae a card as the switch is switched Issue E19 message to serial port and beep once Does card contain program N yes and is Q switch ON in Datataker NO Run card program Add moD TRANSFER DATA FROM DATATAKER TO CARD Does NO NO Direct logging Transfer data to XES KES to card card Add to display gt Do YES Xfer Datataker and Allow new data Ar card programs match yes to be appended ii A and is NOCOPY
109. ger software packages for IBM and compatibles Options e Panel Mount Display for Datataker 50 500 505 515 only e Channel Expansion Module see page 33 e Enclosures see page 33 4Ah rechargeable gel cell battery 17Ah alkaline battery Solar panels for remote site powering 512Kbyte and 1Mbyte PC Card PCMCIA memory cards Memory card reader connects to computer via serial port Memory card reader connects to computer via parallel port Modem Manager for intelligent supervision of remote modems Telephone cellular and spread spectrum radio modems DeLogger Pro software package for IBM and compatibles DASYLab software package for IBM and compatibles DeCopy Delmage software package to read PC Card PCMCIA memory cards via PC Card ports in IBM and compatibles Appendix Specifications cont Channel Expansion Module S Cia ET Pare Ree MT Pe EEE ao _ The Channel Expansion Module CEM connects to the Datataker 500 505 600 605 and Geologger 515 615 to increase the number of analog and digital channels One or two Channel Expansion Modules can be connected to these loggers All input signal types and sensors supported by the Datataker are also supported by the Channel Expansion Module Analog Inputs e 10 differential or 30 single ended can be used in any mix e Relay multiplexer Common mode range is dependent on the Datataker model Input withstanding voltag
110. ght S By default all scan timing is synchronized to the previous midnight Schedules with a time trigger will scan on every multiple of the time interval since last midnight For example the schedule RA10H will scan at 10 00 00 20 00 00 10 00 00 on the next day and so on If synchronization is disabled by s switch see page 11 scanning is then relative to the time that the schedules are entered RA10H entered at 09 30 00 will scan at 19 30 00 on the first day at 05 30 00 and 15 30 00 on the next day at 01 30 00 and 11 30 00 on the following day and so on Returning Entered Schedules The STATUS2 command returns the currently entered scan schedules and channel lists up to a maximum of 512 characters See Other Commands on page 10 Page 3 This Example has two schedules e Schedule A which scans every 10 minutes RA10M reporting channels 1 hrough 5 as voltage data e Schedule B which scans every hour RB1H while digital input 2 is true 2W reporting the state of digital inputs 1 through 4 1 4DS the average and maximum temperatures from RTDs connected to channels 6 through 9 6 9PT385 AV MX and the interval count on the resetting counter channel 2 2C R The statistical sampling is as ast as possible Scan and Sample Order When different schedules are due to scan at the same time the schedules are scanned in the order of RA RB RC RD and RZ When there are statistical channels in a schedule and the
111. grounds in a system are not at the same electrical potential Differences may be from microvolts to many volts If signal wires are used to connect grounds then ground currents will flow and unpredictable errors will occur This situation is referred to as a ground loop See page 18 Guard an actively driven shield around input signal conductors that is maintained at the common mode voltage of the input signal Signal guarding is used when a sensor has a high output impedance and cable capacitance and insulation leakage are significant The diagram below is an extension to Config 1 on page 18 and shows a full guard and shield implementation Guarin Poa Shield Examples 2V G 5F G Input Bias Current The input terminals of the instrumentation amplifier require a very small current This current can be sourced via input termination resistors or by the signal source If a source for this current is not provided then measurement errors will occur Input Noise unwanted voltage or current generally with an AC component superimposed on the wanted signal LED Light Emitting Diode LSB least significant bit in a byte Monolithic Sensors sensors that are constructed on a single piece of silicon using integrated circuit fabrication techniques Available sensors include those for measuring temperature see page 16 pressure acceleration and concentration of various compounds in gases and liquids MSB most signifi
112. hannels are a as well as for lead acid gel cells four wire connection gt 250A 1 1kQ powering sensors aay RET with five switched lines A Each channel can be OxCHen 8 5V V or custom va g a Guard signal combat Sac eea onge I guard G the effects of cable aie ended channels f The maximum voltage input Laer E NEN 45V SV allowed on any terminal return R impedange signal deat is aa pei to Input termination Soiree En i PR these limits is likel to resistors can be switched in by the T lt 1 cause measurement Ash enad Gnd W E A Lead channel option or out L To errors by the U option L o N E A r rO aline sins Bans l a Special signal Switched 6 9 volt line excite lo conditioning off in sleep mode connector for E 5Vsw input Vibrating Wire i 5 paaa 5V switched for 7 input D sensor power Sione ea return A g B Caution To avoid damage use 6 Volt Precision lead acid battery only ensure correct Voltage to Programmable polarity before connecting the battery The SE Ref terminal can be Frequency Time base amp i i requency Aa pba oiea i ne negative N Converter Counters The VFC frequency is measured over amplifier by usingthe x gt SEret E 5 one line period 16 67 or 20mS to channel option for single ended 8 maximise hum and noise rejection inputs This can provide many 3 race igi VFC by pass for direct see 8SV etc on page 6 of the benefits of differential Ground I oO A
113. hat expression will return 99999 9 If disabled 99999 9 is substituted for reading in the expression The STATUS9 command returns the current IK ik Calibration K Enables auto calibration Issuing a K forces an immediate calibration Datataker always calibrates during a RESET switch settings to the host e g S A Logger number prefix A Prefixes the logger number to a schedule s returned data e g Datataker 19 5PT385 232 5 indicating the data is from logger 19 M m Messages M Enables error and warning messages to be returned to host see Errors page 21 a C Aa E h T K 1 M N IN In Channel numbers N Includes channel number and type if C switch is on with returned data see Output Formats on page 10 0 Q r 8 t U v w x y Z 10 lo Overwrite memory lo Oldest data is over written O otherwise logging stops when memory is full see Logging and Data Retrieval on page 8 i Q Iq Program from card Q Allows the logger to be programmed using a memory card see Memory Card on page 8 q will prevent a logger executing a card program Fixed Format Mode H IR Ir Return data IR Allows real time data to be returned to the host via the COMS port Switching returns off r can reduce power consumption The fixed format mode is recommended for IS Is Synchronise IS Synchronises all schedules time intervals to midnight e g RA1M will scan on the minute otherwise schedules run from entry time see page 3 those writing drivers to interface host software with
114. he other end the reference junction Reference Junction Isothermal block Measurement Junction T microvolt Temperature Prime Sensor temperature gradient Ref Junction Temperature A small voltage is produced when the two junctions are at different temperatures This voltage is produced by the temperature gradient along the wires and not by the junctions It is important that the purity of the thermocouple wire be maintained where significant temperature gradients occur Because high purity wire can be expensive it is common practice to use thermocouple extension wire to cover long distances where temperatures are within the normal environmental range Such wire can be used for measurement junctions but only over a restricted temperature range of typically 20T to 120 Making the Measurement Junction The measurement junction can be made by welding brazing soldering or crimping the two wires together Take care to ensure that the wire material is not contaminated where the temperature gradient is to occur The junction can be insulated or left bare for a more rapid response If left bare ensure that the junction does not make intermittent contact with metal objects This can introduce electrical noise see Grounded Thermocouples below Reference Junction Compensation Conventionally the reference junction is held at OT and thermocouple responses are determined with a OT reference This is inconvenien
115. he schedule scans Assignments outside of a schedule are executed immediately System Timers nST There are four internal reloading System Timers which are read in the same way as channels The four Timers increment at different rates as follows and reset to zero when their range maximum value is reached Timer Rate Default Range 1ST 1 second 60 1 minute 2ST 1 minute 60 1 hour 3ST 1 hour 24 1 day 4ST 1 day 7 1 week The System Timers are synchronised to previous midnight or Sunday and increment at the beginning of each second minute hour or day The Timers are initialised to new values corresponding to the new time and date if the Datataker clock time or date is changed For example if the time and date are set to 13 45 53 and 25 12 92 the Timers are set to 1ST 53 2ST 45 3ST 13 and 4ST 5 Friday System Timers have channel options see page 4 rST range R initial The channel factor range is set between 1 65535 and if the R option is included then the Timer resets to zero after it is scanned read in a schedule If a range other than the default is specified then the timer is initialised to a value calculated from the previous midnight or Sunday Timers can be assigned an initial value or expression e g 2ST 3 If the initial value is greater than the range then the timer is set to zero when the next increment is due Introduction Channels can be sampled frequently and a statistical su
116. ing co incident with a lightning strike is very low Where lightning is frequent we strongly recommend that external energy absorbing lightning protection be wired to each sensor line Further we recommend that Datatakers with higher withstanding voltages be used Thermocouples The Channel Expansion Module has been designed to function with thermocouples The module s temperature sensor is located so that it senses the temperature of the analog channel screw terminals These terminals become the reference junction The Datataker will automatically measure the module s temperature and electrical zero when scanning a thermocouple channel on the module These values are used for reference junction compensation The accuracy of thermocouple measurement is dependent on the isothermal condition of the reference junction If a temperature gradient develops between the modules temperature sensor and the input terminals the error will approximately equal the temperature difference The module utilises relays for channel selection and digital output These are a source of heat as each relay dissipates 150mW when switched on For maximum thermocouple accuracy you should ensure that these relays are not left on unnecessarily A not so obvious reason that a relay may be left on is that the last channel in a schedule remains selected if P15 is set to 1 or 2 This can be resolved if P15 is set to zero ora dummy channel is placed at the end of the sch
117. ing a There are two main reasons for adjusting the settling reading of 10 samples 1 plus 9 extra samples period One is to speed up scanning by reducing the The extra samples are averaged to calculate the settling period The other is to allow additional time for reading This process is different to the statistical averaging sensor signals to stabilise Some sensors require this time function in that the additional samples are taken because of thermal or electrical effects after excitation It is immediately before moving on to the next channel Both best to change the settling period only for the sensors that averaging methods can yield similar results significant need it by framing the channels in 7SV assignments improvement in resolution and noise performance RA10M 1V 7SV 5000 2V 3V 7SV 10 4V How Fast where channels 1V and 4V are sampled with the default The net sampling speed of the Datataker is dependent 10mS settling period while channels 2V and 3V with a on the parameters discussed above and a number of other settling period of 5000mS or 5 seconds factors over which control is limited Note that during the settling period no other Datataker Cause To remove activity can take place other than some communications Even new commands will not be processed until the settling period and the scan are complete For long settling periods this can create the disturbing impression of a 35m8 checking input offset voltage Ik nung Palatal 1000mS
118. ing the Range causes a gain change and resolution to be reduced by factor of ten Sensors 3 Other Subjects Page 18 ADC Details The Datataker uses a precision voltage controlled For maximum line hum rejection the conversion time oscillator as an analog to digital converter ADC An input defaults to one line period i e 16 67 or 20 0mS depending voltage is converted to a frequency and the resulting on the DIP switch country setting see the Appendix frequency is measured digitally This method of conversion Reducing the value of 7SV and 8SV forces the provides high linearity true signal integration and excellent Datataker to sample channels more rapidly 8SV can be 50 60 Hz noise rejection any value between 48 and 1000 hertz The penalty for There are three programmable parameters of the ADC increasing the line frequency setting is that it reduces input settling period conversion time and number of samples per resolution proportionally reading Extra Samples Settling Period The number of samples per reading is controlled by the The settling period the time allowed for the input signal ESn channel option where n 0 to 15 indicates the to stabilise before it is measured is set by 7SV or P10 in number of Extra Samples required For most channels units of milliseconds This defaults to 10 milliseconds but types n defaults to 0 indicating no extra samples The can range from 0 to 30 000mS vibrating wire channel type defaults to 9 indicat
119. ingle ended channel then the channels included depends on the first single ended channel label as follows 1 5 is equivalentto 1 2 3 4 5 1 3 gt 1 1 2 2 3 3 Channel 1 44 gt 1 2 2 3 3 4 Number 1 24 gt 1 1 1 2 2 1 4 gt 1 2 3 4 Channel Type Label The DT50 does not support the excite terminal as a single ended input Channel Expansion Module Address The Channel Expansion Module CEM channels are addressed by prefixing the module number and colon to the channel number eg 2 5V indicates channel 5 on the second CEM O N N4 amp gt 8 cS Le LS ES Vv L Q O Voltage Voltage 25mV 250mV and 2 5V ranges 1V 1 V 1 0 T attenuation factor High voltage 7V 70V and 100V ranges 2HV 1 0 A attenuation factor Current Current internal 100Q shunt or external shunt 3 l 100 0 T current shunt Q 4 20mA current loop 1 5 L 100 0 T or A current shunt Q Resistance Resistance by 2 3 or 4 wire methods 7KQ max ARiII 1 Bridge 3 amp 4 wire 1 4 1 2 amp full bridge current excitation 1BGI 60 350 0 II arm resistance Q Ratiometric 4 amp 6 wire bridges voltage excitation 1BGV 0 0 V 4W offset in ppm Frequency Frequency analog channels 0 102Hz to 20KHz 2F F2 30 0 T longest period mS Period analog channels 50uS to 9 88 2 P X 30 0 T longest period mS Vibrating wire sensor frequency 3 FW ES9 200 0 delay in
120. ion 4W 9 10 11 12 J can be used for greater measurement accuracy 9 10 11 12 See Thermistors on page 16 18 7 8 Calibrate by variation of shunt value channel factor 18 4 5 Slope correction via attenuation factor relative to 0K 20 21 1 2 3 Calibration slope correction relative to 0 or OF 22 If averaging increase precision with FF noption 22 Result is 0 to 15 or 32 Channel No LSB of byte 1 2 3 4 25 If averaging increase precision with the FF noption 23 24 Delay lt 65 535mS nDSO delay R will generate pulses 23 24 0 s in mask not modified Channel No LSB of byte internal Display panel 1 3 LED 4 beep 5 6 backlight page 12 22 Count range is 0 65535 eg 1C 3 counts 0 1 2 0 1 etc 22 Presetting a counter outside of the maximum count 22 J range eg 1C 5 8 will cause an error 99999 9 CMOS level Set high speed counter 1HSC output mode see page 18 See System Variables on page 6 Assigned via Channel Options return as for a channel Assigned by texf maximum 80 characters see page 6 P36 on page 11 Channel Options in brackets separated by commas no spaces Introduction Channel Options allow the tailoring of channels for input configuration sensor excitation statistical reporting variable assignment and output format Enclose options in brackets after the channel type label Options are Input termination Resistance Single ended input Gain Excite terminal output curr
121. itch is set to u the error message is reduced to an error number e g E3 Note this Switch also reduces the verbosity of other returned data V o VO GF ev S Aa El time set error must be in format defined by P39 and P40 illegal separator or non digits entered E2 input buffer full command too long maximum 250 characters successive commands input too quickly E3 channel option error illegal channel option used see page 5 mutually exclusive options used E4 clear data memory attempt to enter new Schedule while the store contains data or LOGON is enabled E5 data memory full internal data storage memory is full overwrite switch not enabled O E6 data memory empty no data in internal or card memory E7 day set error illegal day number entered E8 Parameter read set error parameter index out of range parameter value out of range E9 Switch error missing switch command character illegal switch command character E10 command error _ CARDID CLEAR CLAST CDATA CSCANS CALARMS CPROG LOGOFF LOGON or RESET incorrectly entered E1l1 input s out of range one or more analog inputs is over range check common mode voltage E12 channel list error channel number outside the legal range diff and SE channels mixed in sequence options invalid for channel type incomplete channel sequence invalid channel type single ended channels illegally specified polyn
122. ivity If there is no communications for a period of time defined by P14 in seconds the COMS port will timeout and is closed The default timeout period is 300 seconds 5 minutes The Datataker will respond to the DEL character with lt lt CR LF regardless of the password state This can be used to identify a Datataker The COMMS Port The Datataker COMMS port connector is detailed below Nic o N C Interface Ground The configuration of communications cables for connecting the Datatakers to various computers and modems are detailed below IBM and Compatibles 25 pin Datataker Computer DE9 Male DB25 Female DSR Datataker DeD C Computer DES Male DE9 Female DTR 4 Apple Macintosh Tx Rx GND Fiame Shield Gnd OJOO QOO Male 8 Pin Mini DIN Datataker DE9 Male Page 13 COMMS Port Isolation The COMMS port of all models of the Datataker Series 2 data loggers are electrically isolated to 500V Using Modems with Datataker The following comments relate to the Remote Modem at the Datataker end Settings for the Local Modem at the computer end are not critical and the manufacturers defaults can be used Enter the following commands into the Datataker using a computer running DeTerminal or other communications program before connecting the Remote Modem le Datataker echoes OFF m Datataker messages OFF t Datataker returns OFF It is suggested
123. l Range AC 9 18Vac AC DC AC DC DC 11 24Vde AC DC Gnd 9V Alkaline Battery 6 2 10Vdc Alkaline Bat 6V Gel Cell Battery 5 6 8Vdc Lead Bat The gel cell connection provides temperature compensated charging with voltage 6 90V and current 1A limiting for a three cell battery when an AC or DC supply is also connected It is not recommended to connect both an internal and an external battery If two batteries are required it is better that the external battery is a larger capacity 12V battery and is connected as External DC Power The simplified schematic on page 25 for the Datataker 500 and 600 is also applicable to the Datataker 505 and 605 Page 26 Power Consumption The Datataker 505 and 605 will consume very little power if it is allowed to sleep Less power is consumed if the logger is powered via the battery terminals rather than the AC DC Power terminals This is because the battery charger circuit draws additional current Power Source Condition Current typical battery awake 220mA battery sleep 0 36mA AC DC awake 230mA AC DC awake amp charging 600mA AC DC sleep 5mA AC DC sleep amp charging 400mA Battery life for the Datataker 505 and 605 is about one third longer than that of the Datataker 500 and 600 for slow scan
124. l Excitation Jumper shown in Single Ended Reference Terminal input termina normal position lA id External Excitation EE Single Ended Reference For sensors that require non standard powering or The Channel Expansion Module has a SE Ref input excitation an External Excitation input terminal is able to terminal with an identical function to that found on the direct power to the Excite terminal of a selected channel Datatakers It provides a floating common for single ended This option can be enabled by moving a jumper to the outer input see the X channel option on page 5 two pins on a three pin header The jumper is accessed by The SE Ref input is switched on each module but not on removing the module s top cover most Datatakers The DTxx5 series are the exception This The normal position of the jumper between the inner means that if the SE Ref terminal is used on one or more two pins provides the standard Datataker 250yA 2 5mA or modules it should not be used on the Datataker The 4 5V excitation If the external excitation option is selected selected module s SE Ref input will appear as an output on these are not available on any channel of the module Care the Datataker s SE Ref terminal must be taken in assigning channels If for example an The input voltage range of the SE Ref input is identical to Expansion Module is wired with a four wire RTD and several that of the Datataker to which the Channel Expansion bridges requirin
125. lied This order is independent of the order you list the options For example the table shows that the logger evaluates a polynomial Yn before a difference DF Time The Datataker hardware clock has a resolution of one second based on a 24 hour clock The Time is read in the same way as any channel but without a channel number T returns Time 11 45 10 Time can be in several formats selected by P39 as follows P39 Format _ Example 0 default hours minute seconds 11 45 10 1 seconds since midnight 42310 2 decimal hours 11 7528 System Variable 12SV returns Day Time as decimal days P40 defines the separator in the hh mm ss format which defaults to ASCII 58 colon When setting the clock you must use the Time format defined by P39 and P40 For example if P39 2 in this case P40 does not matter then the clock Time must be set as a decimal value T 11 7528 Time is maintained during a RESET or power down Time and Date stamp can be added to real time data and to logged data see Switches T and D on page 11 Time and Date are automatically logged whenever data is stored Date The clock also maintains the Date which is read in the same way as a channel but without a channel number D returns Date 25 12 1991 Date can be in several formats selected by P31 as follows P31 Format Example 0 Day number ddddd 724 1 European dd mm yyyy 25 12 1991 2 NAmerica mm dd yyyy 12 25 1991 System Variable 12SV returns Day Time as decimal
126. llows Baud rate 300 1200 2400 4800 or 9600 Data bits 8 Parity none gt fixed Stop bits 1 The baud rate is set by a DIP switch which is accessed by removing the Datataker top cover Refer to the Appendix for your Datataker for details of the location of the switch and the settings The Datatakers are shipped with the baud rate set to 4800 baud Operation All communications with the Datataker are with the ASCII character set The eighth bit is normally a 0 however an extension to the character set for the text strings and for special display characters is possible if this bit is set to a 1 For all commands other than switches and text strings the Datataker ignores lower case characters By default most characters that are received by the Datataker are echoed transmitted back to the host This action is disabled by the echo switch e Special Characters XOFF stops Datataker transmitting XON allows Datataker to transmit BS backspace deletes previous character echoes BS space BS DEL delete Alt 127 clears command input buffer echoes lt lt CR LF terminates a command line echoed as CR LF ignored command separator CR return LF line feed Space and tab hatch network address identifier semicolon directs command to memory card single quote comment character up to a CR message to remote COMS port in a network XOFF XON If the Datataker returns data faster than the ho
127. lock loop H measurement filter circuit Signals in the order of tens of microvolts can provide useful reading Transformer coupling ensures very high common mode rejection a characteristic that is needed to reject 50 60 hertz and other interfering noise Differential Connection The preferred method of vibrating wire sensor connection is differentially between the and inputs of a channel Example 1FW Channel Vibrating wire Terminals sensor cO Grouna Differential VW Connection While the shield is optional it will often be found necessary when noise pick up is a problem The preferred shield connection point is one of the Geologger s ground terminals or a case ground terminal strip If the channels return terminal R is not used for other purposes it can be used as a shield terminal However as the return terminal is internally connected to ground via a 100Q resistor its effectiveness is not as great as a direct connect to ground Also if lightning strike is possible then the resistor may be destroyed Single Ended Connection Vibrating wire gauges may also be connected single endedly that is they can share a common terminal A channels return terminal becomes the common and each of the channel s remaining three terminals become single ended input terminals It is now possible to connect three sensors to each channel 1 FW 1 FW 1 FW m Channel Terminals Ge Ground Vibrating wire
128. log and 7 digital channels Relay Multiplexer 100V input Network support as for DT500 600 Channel expansion socket Analog Inputs 10 differential or 30 single ended or any mix Switchable attenuator that allows high voltage measurement Sampling rate 25 samples sec Channels have 500 volt isolation while not being read Input impedance 1MQ or gt 100 MQ selectable Common mode range 3 5 Vdc 100 Vdc attenuators on Common mode rejection gt 90 db 110 db typical Series mode line rejection gt 35 db Sensor excitation of 4 5V 250 0pA or 2 500mA each channel Full half and quarter bridges voltage or current excitation Multiplexer type relay Input Type Channels Range Units Reso DE SE lution DC Voltage 10 30 25 mV 1pV 250 mV 10pV 2500 mV 100V 7 V 250V 70V 2 5mV 100V 25mV DC Current 10 40 0 25 mA 200nA 2 5 mA 1pA 25 mA 10pA Resistance 10 20 10 Ohms 0 5mQ 100 Ohms 5mQ 500 Ohms 50mQ 7000 Ohms 500mQ Frequency 10 30 0 1 20 000 Hz 0 01 DE refers to double ended or differential channels and SE refers to single ended channels see Glossary on page 23 Accuracy is expressed as percentage of reading at 25 see page 17 All analog input channel terminals except for the Return R terminals are capable of withstanding 1 5KV for 10uS 500V for 50mS and 100V indefinitely The return terminal can withstand only 5 of these voltages These withstanding
129. m It Prefix data with time It Prefix time to logged data equivalent to a T at beginning of a schedules channel list the Datataker In this mode the u n e r switches lU lu Units text lU Measurement units are appended to returned data see Output Formats on page 10 and error messages are verbose see Errors on page 21 are forced to ensure a fixed format These N N Speaker enable N Enable speaker and headphone output by Geologger switches are restored to their original values when the Datataker receives h See the Datataker WN Iw Intermediate channels Iw Allows working channels see channel option W on page 5 to be reported and displayed but not logged see also Calculations on page 7 Advanced Communications Manual for a complete IX Ix Progressive max min Ix Allows the display of progressive maximum and minimum values for statistical channels on a Datataker display description For advanced users only N ly Priority to return data ly If real time data has not been returned before next scan becomes due the returning of data is given priority and the scan may be omitted IZ Iz Stops alarm messages IZ Enables alarms to issue action text to host computer or printer See Action Text on page 9 I Default switches Sets all switches to default state Display Panel Operation Introduction The Datataker display panel has a 2 line by 16 character back lit liquid crystal display 5 keys 3 warning LEDs and a buzzer The display
130. mS Time Time of day T Day or date D System timers for program control etc ST 1ST 60 60 24 7 range Temperature Thermocouples B C D E G J K N R S and T 10 30 5 10 10 30 TB TC TT 3TJ 1 0 T attenuation factor Platinum RTD s a 0 00385 0 00392 10 20 5 10 10 20 PT385 PT392 5PT392 100 0 II OT resistance Q Nickel RTD s 0 005001 10 20 5 10 10 20 NI 1NI 50 1000 0 OT resistance Q Copper RTD a 0 0039 10 20 5 10 10 20 cu CU 135 100 II OT resistance Q Thermistors Yellow Springs 400XX series 10 20 5 10 10 20 YS01 07 16 17 2YS04 1e10 1 parallel resistor Q AD590 amp AD592 Analog Devices 10 40 5 15 10 40 AD590 4AD590 100 0 V shunt resistor Q LM335 National Semiconductor Corp 10 30 5 10 10 30 LM335 3LM335 2 0 V attenuation factor LM34 amp LM35 National Semiconductor Corp 10 30 5 10 110 30 LM34 LM35 5LM35 1 0 V calibration factor Digital State input on a digital channel 4 20 DS 4DS Byte input on a group of digital channels 1 4 bit 1 5 bit 2 8 bit DB 1DB 7 255 bit mask decimal Digital state input on an analog channel 10 30 5 10 10 30 AS 5 AS 2500 T threshold mV Output on a single digital channel 1 ON amp low 10 DSO 38DSO 1 0 delay or width mS Byte output on a group of digital channels 1 8 bit DBO 1DBO 0 255 bit mask decimal Display if present backlight LED s and beeper WARN ISWARN 1 0
131. mmary returned at longer intervals see Statistical Sub schedule on page 3 Statistical channels are sampled for the period between report times and the statistical summary is generated and returned at report time Channels that require statistical sampling must include a channel option to indicate the statistical information to generate These options are Option Description Appended to Units AV average Ave SD standard deviation SD MX maximum Max MN minimum Min TMX time of maximum Tmx TMN time of minimum Tmn DMX date of maximum Dmx DMN date of minimum Dmn INT integral Int Hx y n mCV histogram none The statistical option is defined by including it as a channel option in parentheses after the channel type For example RA1M 3TT AV will return 3TT 103 7 Deg C Ave which is the average AV temperature returned every one minute RA1M for the type T thermocouple 3TT which is connected to channel 3 The text Ave is appended to the units to indicate that the data is an average If statistical channels have not been sampled before they are reported then these channels report error E53 see page 20 and data returned as 99999 9 This condition is likely to occur when the RS trigger is an event the statistical sub schedule has been halted or a statistical scan interval RS is longer than the reporting time interval If statistical options are part of a Multiple Report channel see page 4 th
132. mple Alarm number 5 is defined or replaces any previous definition A current loop on single ended channel 4 4 L scaled by a span S3 is monitoring a boiler temperature If the temperature drops below 110 0 or rises to or above 150 0 for more than 10 seconds 10S digital outputs 1 and 4 1DSO 4DSO are set ON the message Boiler Temp 152 0 is sent to the host and to the display if present and schedule RA is re programmed to scan at two second intervals RA2S Action Commands optiona The Action Text can include a group of one or more Datataker commands enclosed by square brackets These are Action Commands and are executed once when an ALARM or IF alarm transits from false to true or repeatedly at the RZ rate while an ALARMR or IFR alarm remains true Action commands are a very powerful programming facility for the Datataker You can use any Datataker command in this context so many things become possible re programming on events adaptive schedules programmed calibration cycles control of digital outputs Adaptive scheduling is a common use for managing the Datataker from the Alarm command In the example RA15M 1V AV Wind speed S1 1CV IF1 1CV gt 5 0 RA2M IF2 1CV lt 4 5 RA15M the average wind speed is recorded every 15 minutes and assigned to a variable 1CV If the average exceeds 5 0 m s the schedule s report interval is reduced to 2 minutes by the first alarm IF1 command When the
133. n These outputs are set on transitions of the Alarm condition and after all Alarms have been scanned Only two output channel types are permitted nDSO nWARN General purpose digital output LEDs 1 3 Beeper 4 etc see page 12 If multiple alarms use the same output channel then the effects are OR ed Any active alarm will set the output to ON but all alarms must be false to reset the shared output OFF The output channel can be cleared at any time by digital assignment e g 1DSO 0 Unlike Action Commands see right the Output Channels are set or cleared on both the positive and negative transitions of the Alarm condition Delay Period optional When the Alarm s conditional test changes state i e false to true or true to false no action is taken until the delay period has expired AND the state has not changed during this period The format is IS Seconds IM Minutes Im Hours nD Days where nis an integer in the range 1 to 255 When the state changes during the delay period the delay counter is reset and will not count again until the next state change The result is a filtering action that ensures that input noise will not cause unwanted or rapid output actions Conditional True Test False l Delay timing pa l lt gt gt Full Delay 7 i True Periods mena Alarm action False 4 gt time Action Text and Commands issued Note that
134. n as infrequently as possible RA1H especially for statistical schedules 1V Humidity S1 AV 2PT385 Air temp 4W AV 1CV RZ1H set alarm rate if using alarms IF 1CV gt 25 LOGON IF 1CV lt 20 LOGOFF END The COMS port activity could be reduced to save power by setting the r switch but this can cause confusion define channels Battery Life The battery life that can be achieved by the Datataker depends on scan interval including alarm and statistical scans number of analog channels number of digital channels number of alarms e sensor excitation power draw complexity of any calculations baud rate A precise calculation is very involved but the chart below gives a conservative estimation of battery life for different operational conditions Page 15 The chart makes certain assumptions all channels are scanned at the same rate alarms are scanned at same rate as channels default switch and parameter settings sensor current draw is less than 5mA and is switched 80 of battery energy is available battery shelf life is long baud rate is 1200 If your operation arrangements vary greatly from these assumptions then refer to Some Details below to calculate average current draw and battery life Battery Life for DT50 and DT500 600 models by KY SS Number of Channels Scanned at Regular In
135. n then be tested in alarm statements Integration with respect to time between two readings the latest and previous J e g RA2S 1V RC 1CV RZ2S ALARM1 1CV gt 0 45 1DSO Any non thermocouple temperature sensor measuring isothermal block temperature If already compensated use 11SV TR as reference channel An electrical zero as measured at isothermal block see Thermocouples on page 16 Used to nominate a voltage channel as reference for ratiometric bridge measurements see Bridges on page 17 Config Line see Multiple Average Reports on page 4 Standard deviation These channel options link the channel to the statistical sub schedule RS The channel will be sampled at times determined by the RS trigger which defaults to continuous rapid scanning At the report time as determined by the RA RB RC RD or RX schedules the statistical summary will be reported If no sample has been taken before the reporting time then an error 9999 9 is reported Maximum NOTE Statistical options are not valid in alarms If you want to alarm on a statistical value then use a Minimum Time of maximum channel variable i e nCV to pass the statistical value to the alarm Time of minimum Date of maximum Date of minimum Integral The time integral s time base is seconds For other time bases apply a Span or Polynomial e g Y1 0 2 778e 4 AHrs for hours Report time sampling the results are place in variables n m 3 CV classes m 2 CV under range m 1 C
136. nable accuracy is required at high relative humidity where the wet bulb depression is small If platinum RTD s are used as in the above example then they should have good accuracy or matching 0 2C Good accuracy can also be achieved by use of a temperature difference sensor such as a thermocouple or thermopile Measure the dry bulb with a standard grade temperature sensor and subtract the difference sensor reading to obtain the wet bulb temperature The sensors are normally placed within a radiation screen to prevent radiant heat affecting the readings This is particularly important for out door applications Program Branching The Datataker has no formal branching or alternative processing commands to control program flow However some flow control is possible using Boolean logic and or alarms Boolean expressions can be used to return a result which is dependent on a condition being true or false as follows 2CV 1CV2 1CV lt 1000 1CV 4 1CV gt 1000 which returns a value of 2 1CV if 1CV is less than 1000 or a value of 4 1CV if 1CV is greater than or equal to 1000 The Boolean expressions 1CV lt 1000 and 1CV gt 1000 will result in 1 0 if true or 0 0 if false The BASIC language equivalent of this expression is IF 1CV lt 1000 THEN 2CV 1CV 2 ELSE 2CV 1CV 4 The same branch can also be effected by a pair of alarms as follows IF1 1CV lt 1000 2CV 1CV 2 IF2 1CV gt 1000 2CV 1CV 4 However alarms must be us
137. nal memory is copied to the card Schedules what to do when to do it Introduction Schedules have three parts a schedule identification a scan trigger and a list of channels to scan RA2M 1W 1V 2R 3 5TT x N X Schedule ID Trigger Channel List Schedule ID Datataker provides four distinct types of schedules which are identified by their schedule ID RA RB RC RD triggered schedules RX polled schedule X from host RS statistical sub schedule RZ alarm schedule see page 9 The schedule identifier except for the RX schedule is followed by a trigger a Time Interval or an Event and optionally a While condition If there is no schedule ID or trigger then the channel list up to the next carriage return is scanned once immediately If the trigger is omitted then the channel list is scanned as rapidly as possible until halted Trigger by Time Interval An integer number of seconds minutes hours or days defines a schedule scan interval rs seconds nD days M minutes mH hours none as rapidly as possible where n is in the range 1 to 65535 For example RA5S will scan every 5 seconds The first scan occurs on the next multiple of the interval since last midnight see Synchronise to Midnight below OR Trigger on Events Digital inputs nDS excluding CEM low speed counters nC and high speed counters nHCS can also trigger scans nE trigger on and transitions of a digital input n E trigger on
138. nd second item 1V 101 0 returns the Datataker reading multiplied by 101 0 in units of millivolts as follows 1V 2 543 mv 1v 256 84 mv In this example the channel factor could for example be the attenuation of an input voltage attenuator network Intrinsic Functions Fn The Datataker has seven inbuilt and mutually exclusive intrinsic functions An Intrinsic Function is applied as a channel option The Intrinsic Functions available are Function Text Modifier F1 1 x_ inverse Inv F2 x square root Sqrt F3 Ln x natural logarithm Ln Description F4 Log x logarithm base ten Log F5 Absolute x absolute value Abs F6 X X square Squ F7 Grey code conversion 8 bit Gc Channels with an Intrinsic Function applied will return data appended with the text in the right hand column of the table For example 1V F2 will return the square root of the reading 1v 455 6 mV Sqrt If you place more than one Intrinsic Function in a channel s option list only the last will be applied Spans Sn Spans are used to define calibrations for linear sensors Spans are particularly suited to 4 20mA loop inputs Physical Output eg Calibration upper physical b lower physical Signal Input 7 zc Z d e H mV lower signal upper signal i A total of 20 Spans and Polynomials can be defined A span is defined with the following syntax Sn 4 b c d text where n 1 to 20 the text replaces the channel units text
139. ng Sn 6 speaker V 28 statistical sub schedule 3 STATUS command 10 status screens 12 stop bits 1 13 storage capacity 8 straingauges 17 switches 11 synchronised scanning S 3 system timers NST 4 6 system variables n SV 4 6 temperature sensors 4 16 19 28 units P36 11 TEST command 10 text string 6 thermistors YSn 4 16 thermocouples TJ TT etc 4 16 time T 1 6 triggers 3 units text 3 4 11 unloading data U 8 variables n CV 4 7 version number of ROM 10 vibrating wire gauges n FW 4 27 voltage input 4 19 waking by COMS port 13 network 14 schedule 3 WAKE terminal 15 WARN 4 12 warning LEDs n WARN 12 XON XOFF 10 13 Irtaret Hore Page hHip wow catataker com daker Dia Betrorics USA Ic 22961 Fitm Wy Site E LegraHlls A263 USA Are 1 714452 070 LEO 91GGER Fax 1714 452 1170 Enail deusa chteteke com UK Cfi2 Daa Bettoics UK Lich 26 Bares te Wt Aenieoe Hetfockire S46 2HB u ited Kir cob nN Are 444 1462 481291 Fax 414 1462 481375 Printed in Australia ACN 006 134 863 CV 0002 A0 S04
140. nt least significant characters are truncated from the right Fixed fields are useful when returned data is to be tabulated or forwarded to software with a simple string parser 23 5 23 46 More Commands TEST The TEST command forces a calibration and checks the functionality of the hardware The TESTR command will force continuous calibrations The information returned to the host computer is Returned Data n Description Valid Range Datataker 52 Ver 5 xx 0 configuration amp ROM version Vos mV 0 009 1 input offset voltage 1 mV vfo V 7 308 2 input voltage for VCO 0Hz 6 0 to 8 50V Fc kHz 18 200 3 VCO centre frequency 11 46 to 23 87kHz CMRR db 99 6 4 common mode rejection ratio gt 90db Vos3 mV 0 238 5 three wire input offset voltage 1 9 to 3 1mV Tos 1 0023 6 terminator attenuation 0 99 to 1 01 Ios nA 3 7 input bias current offset 30nA Ibia nA 15 8 input bias current 90nA Ibat mA 0 5 9 battery current for discharge 500 to 600mA Vbat V 6 6 10 battery voltage 5 4 to 13 0V Vos uV 95 11 single ended offset voltage 600 to 110uV Vos uV 33 12 single ended offset voltage 180uV Vos uV 10 13 single ended offset voltage 180uV Vos uV 66 14 single ended offset voltage 110pV to 600V Vosd uV 5 15 differential offset voltage 180uV Ics1 mA 2 4994 16 current source 1 current 0 5mA to 10MA Ics2 uA 250 31 17 current
141. ntifies the alarm If you enter two alarms with the same number the second overwrites the first The Alarm Number must not be greater than the P30 value see Number of Alarms The Alarm Number is also used to poll for current alarm data values with the n command see Polling Alarm Data and in the HZn GZn and CALARMn commands Channel Definition Any input channel type with options see Channel Types on page 4 or Channel Variable or System Timer System Variable etc can be the input to Alarm commands Conditional Test The input channel or Channel Variable is compared with one or two comma separated set points The set points can be a floating point constant or a Channel Variable The number of set points depends on the logical operator Operator Set Points Operation lt 1 less than set point gt 1 greater than or equal to set point lt gt 2 less than first set point OR greater than or equal to second set point gt lt 2 greater than or equal to first set point AND less than second set point The following example shows use of a conditional test ALARM3 2V gt 660 0 4DSO When the voltage on channel 2 equals or exceeds 660 0mV the digital output channel 4 is turned ON When the voltage drops below 660 0mV the output is turned OFF Output Channels optiona One or two comma separated output channels see Channel Types on page 4 can be declared for each Alarm to reflect the alarm conditio
142. o the previous method but is faster at 30 channels every two seconds 5 By frequent Unloads see Data Logging and Retrieval on page 8 This method uses the Datataker s store as an expanded output buffer that is cleared after each unload by the CLAST command For example program all loggers u n P25 36 program logger 21 21 RA10S 2V 3 4TT LOGON logger 29 29 RA10S 3TT1 4DS LOGON unload logger 21 21 U receive 156 54 23 5 28 9 receive 157 33 23 3 29 7 clear data 21 CLAST unload logger 29 29 U receive 105 6 0110 receive 104 40010 clear data 29 CLAST The unload steps are repeated for the duration of the monitoring task This method ensures regular sampling by normal schedules 6 By synchronous returns from all loggers that have been programmed by standard schedules RA RB RC and RD see page 3 This is the most flexible method as it allows each logger full control of the schedule scanning However in order to work it requires that the host software use more complicated data routing and time stamping techniques 7 The use of the fixed format mode H is recommended for real time networks See Fixed Format Mode and the Datataker Advanced Communications Manual Power and Battery Connection tare care Powering the Datataker The Datataker data loggers can be powered from Source Connection Terminals Typical Range AC 9 18Vac AC DC and AC DC DC 11 28Vdc AC DC and GND Battery 6 9
143. ocket SS N ES ES 22 jon on joi default integration period 16 7mS for US Convert 5 vol 10 9 8 7 6 5 Display 2 23 jon lion jon and 20mS for others for the analog to 1 Lamp Switched Single Ended Ref Analog Channels Connector Network T X en Ee a aigital camaron and the default date a 250 mm B The Datataker 500 and Datataker 600 both have an RS485 s3 on Paila format pee Dater on page 8 a 7 Sapir network A proprietary network protocol supports error free 57 lon lon on Baud Rate and Address JS communications between up to thirty two Datataker 500 and 8 58 lon off lo Dip switch position four s4 is not p the Multipl Ea mE Datataker 600 series data loggers See page 14 for more details Q 29 lon off lon available for setting the address if 300 or owering e Multip exer ERS SW USW SW USW 30 lon ba lo 9600 baud rate is selected This reduces The Datataker 500 and 600 have an option to maintain multiplexer Mux Power Mux Power 31 lon on Jon the address range to 0 15 power in low power mode This is achieved by moving the Mux Power Power down Power maintained link located under the top cover near channel 9 as shown on the right Position Position Appendix Datataker DT505 and DT605 Introduction Each model in the Datataker data logger range has a number of characteristics which differentiates it from theeother models This page describes the characteristics for the Datataker 505 and the Datataker 605 10 ana
144. ode when a memory card is used You can change the O mode switch at any time however the internal memory does not become available if a memory card is in use Storage Capacity Data storage capacity is difficult to calculate because of the three byte header per schedule per scan If the three byte header is considered as a channel then the following figures are reasonably accurate Memory Capacity readings Total card internal Internal 13 650 13 650 512K PC Card 169 260 182 910 1MPC Card 343 980 357 630 Time and date in a channel list are handled as any other channels i e three bytes each It is more efficient to use the T and D switch commands see pages 6 and 11 Not Logging Channels All input channels in RA RB RC RD and RX schedules are logged after the LOGON command is issued The NL No Log channel option prevents logging of individual channels The W Work channel option prevents logging return and display of the channel data Unloading Data Logged data is unloaded from internal or card memory by U source schedule start point end point source from internal memory M from memory card none unload from the memory card then if same data set internal memory A B C D or X schedule none unloads all schedules logged start point time date or time BEGIN from beginning of stored data LAST from end of last unload none from beginning of stored data end point time date
145. odified under program control see Alarm Action Text on page 9 A list of channels without a trigger specification may be entered at any time These are scanned immediately without affecting other schedules which may be operating A schedule s channel list cannot be altered without re entering all schedules In fact all schedules must be entered at the same time either all on one line or between BEGIN and END keywords see Schedules on page 3 Scaling and Calculations page 7 The Datataker can scale the channel input data to engineering units by applying polynomials spans or intrinsic functions Arithmetic expressions provide cross channel and other calculations Various statistical functions including averaging and histograms can be applied Data Reduction pages 3 6 9 In many instances you can reduce the volume of the data recorded by taking averages maximums minimums standard deviations histograms or integrals Use conditional statements to determine when data is logged see Trigger While on page 3 and Alarms on page 9 Alarms page 9 The Alarm facility of the Datataker is flexible and powerful Alarms are used to warn of error conditions and to control the Datataker s operation The key words ALARM and IF have identical meaning Alarms allow logical comparisons with set points control of digital output on the alarm condition issuing of messages to the host computer and Display execution of
146. of channel readings Maximum channel reading Minimum channel reading Time of maximum channel reading Time of minimum channel reading Date of maximum channel reading Date of minimum channel reading Integral for channel Histogram x lower limit y upper limit Assign channel reading to variable Add channel reading to variable Subtract channel reading from variable Multiply variable by channel reading Divide variable by channel reading Fixed point n decimal places Exponential n significant digits Mixed FF and FE n decimal places User defined channel name text No return No log cannot be used in Alarms No display Working or intermediate channel Bar graph 1 10 100 0 to 255 0 to15 1e18 1to 20 1 to 20 1to7 xy 1e18 1 to 100 1 to 100 1 to 100 1 to 100 1 to 100 0to6 0to6 0to6 ascii text 1e18 Poly amp Span index shared a total of 20 allowed WOWDMDDDDADDA NNNNN DMDDDDMDDNMNOONUNUH AAAA WWWNM N HAH aaau see sees ana comma separated no spaces allowed and in any order When the same channel is listed more than once each listing is treated as a separate entity with options applying only to the listing in which they are placed L Page 5 Channel Number Channel Type This example configures the logger for 4 S 4 wire 4W resistance measurement of an RTD temperature sensor The sensor is a 5PT385 4W 200 0 Steam Temp FF0 2j platinum temperature sensor PT385 which ha
147. olating the COMS port normally solves the problem see COMS Port Isolation on page 13 Noise Pick up There are two main ways in which noise can be introduced into signal wiring by capacitive coupling and by magnetic induction There are different counter measures for each Shielding signal wiring will minimise capacitive noise pick up Signal wiring that is close to line voltage cable should always be shielded see Config 1 on page 19 Magnetic induction of noise from current carrying cables or from electrical machines especially motors and transformers is a greater problem Shielded cable Bridges wiring configs 13 14 15 16 17 Introduction Because of its sensitivity the Wheatstone bridge circuit is a commonly used circuit for the measurement of small changes in electrical resistance Applications include load cells pressure sensors and strain gauges Excitation Vex Voltage When one of the four resistors in a bridge is active sensitive to the parameter being measured the circuit is called a quarter bridge and the remaining three resistors are called bridge completion resistors Similarly half and full bridges imply two and four active gauges The bridge is a ratiometric circuit where the output sensitivity is proportional to the excitation voltage Unfortunately the excitation voltage is reduced by resistive cable and connector voltage drops There are two ways the Datataker can resolve this problem Voltag
148. omials or spans specified for day or time polynomials or spans index out of range E13 digital failure digital input output circuit has failed e return logger for service E14 communications error baud rate parity or stop bit errors framing errors due to noise on COMS port E15 assignment error channel number too large output channel or system variable out of range counter preset to value greater than maximum count i e 1C 25 30 E16 linearization error thermocouple outside range RTD or thermistor outside linearization range Error messages can be switched off by the m switch The default is for errors to be reported M During an Unload operation see Data Logging and Retrieval page 8 error reporting is disabled until the Unload is complete In a Network errors in remote Datatakers are reported back to the host computer Error Category E17 clear card data inserted card has data in data area E18 STATUS command error STATUS incorrectly entered STATUS n outside the range 1 to 9 E19 Card Write Protected E20 illegal character s invalid characters in the command E21 illegal separator s E23 scan schedule error event or counter channels invalid E24 Unload command error E25 channel table full E26 Halt command error Schedule ID not A B C Dor Z E27 TEST command error TEST incorrectly entered E28 Go command error Schedule ID not A B C D or Z internal
149. on 3CV W 3CV 1CV COS 2CV Sum x comp s 4CV W 4CV 1CV SIN 2CV Sum y comp s 5CV W 5CV 1 0 Number of scans RB1M_ Calculate report and log every minute calculate mean magnitude 6CV W SQRT 3CV 3CV 4CV 4CV 5CV 6CV Mean Wind Mag Y3 FF1 calculate direction 7CV W ATAN 4CV 3CV 57 29 determine direction quadrant 7CV W 7CV 3CV gt 0 AND 4CV lt 0 360 7CV W 7CV 3CV lt 0 AND 4CV lt 0 180 7CV W 7CV 3CV lt 0 AND 4CV gt 0 x 180 if wind speed is zero return 1 0 7CV W 7CV 6CV lt 0 7CV 1 7CV Mean Wind Dir Y4 FFO 1 5CV W 0 END LOGON G The following program scans ten channels and calculates across channel average BEGIN RA10S 1CV W 0 clear 1CV 1 10V 1CV W sum 10 voltages into 1CV 1CV 1CV 10 divide by 10 for average END Data Logging and Retrieval go for quality not quantity Introduction The Datataker has two locations in which to store data the internal memory which stores13 650 data points PC Card PCMCIA memory cards which store up to 343 980 data points in a 1Mbyte memory card The management for the internal memory and memory card varies according to the state of an inserted card as follows If an empty memory card is inserted the Datataker will transfer any data in the internal memory to the memory card and then will continue logging to the card
150. or time END to end of stored data LAST to end of last unload none to end of stored data All are optional however an end point can only be included if a start point is included Some examples are U unload all data oldest first U LAST unload most recent unloaded data UA BEGIN LAST unload schedule A from beginning to the same point as previous unload UMB 12 00 19 1 91 12 00 20 1 91 unload B schedule data from memory card between the two times The oldest data is returned first and the schedules are merged chronologically in X A B C then D order The format of unloaded data is the same as for real time data see page 5 During an Unload the r return e echo and m error messages switches are disabled These are returned to their previous state on completion of unload Data is not cleared from memory by Unload operations Quitting an Unload An Unload operation is aborted by the Q quit command Time and Date Stamping The scan Time and Date can be prefixed to the data unloaded from each schedule by enabling the T and D switches This can be done even after the data is logged Time and Date prefixing defaults to OFF t d Logging Status You can check the number of data points stored and the free space with commands and system variables STATUS lines 5 6 and 7 or STATUS5 STATUSG6 etc schedule 1SV Internal data points free 2SV Internal data points stored 3SV Memory Card data points free 4s
151. oys two standards a 2 500V 20ppm T voltage reference and a 100 0Q 10ppm reference resistor You can trim these with P1 and P3 see Parameters on page 11 and 17 on page 20 with the BGV channel type This is termed voltage excitation BGV channels expect the bridge excitation voltage Vex to have been previously sampled in the same schedule by a voltage channel with a BR bridge reference channel option e g nV BR If this is not done the excitation voltage is assumed to be 5 0 volts The BGV channel type lets you declare an offset for each channel e g NBGV 325 which will subtract 325 ppm from the reading This is useful for zeroing out initial offsets Constant Current Excitation The alternative lead compensation method is to apply a constant current defaults to 2 50mA to the bridge assuming the bridge resistance is known and constant and then calculate the excitation voltage Vex For full and half bridge constant current excitation use the nBGI Ra channel type where Ra is the bridge arm resistance in ohms If the arm resistances are not equal then a correction must be applied For the full bridge all four resistors are external to the Datataker see wiring config 15 on page 19 One or more of these resistors may be active and the remainder are completion resistors Four connection wires are required so that the 4W channel option is required For example nBGI 4W 120 defines a four wire constant curr
152. port also have an address however it only serves for Datataker identification Network and Modems The network can be extended by modems or radio modems that can operate at 1200 baud and can automatically turn around change direction of data transfer This is an important issue with radio modems where changing from transmit mode to receive mode can take as long as 500mS The network turn around time can be adjusted by parameter P7 in increments of 14mS For example setting P7 22 would set the turn around time to 300mS There is no electrical signal to indicate turn around The modem must detect when the Datataker is sending network data and rapidly switch to transmit mode The Datataker does not issue any message preamble See the Datataker Advanced Communications Manual for details Network modems must be dumb As the Datataker already provides an error correcting protocol the modem must not overlay an additional protocol layer This applies particularly to radio modems where it is common to find error correction built in Messages to COMS Ports You can connect other devices to the remaining Datataker COMS ports These may be a printer a terminal or another computer Network a Twisted Pair of Wires note polarity Net Net Net COMS COMS COMS Datatakers P Second Host Printer Host Computer The following commands allow text to be sent to these ports from the network host
153. ppm 0 36 400 ppm 0 62 400 ppm 7KQ 3W I 8 kQ 0 52 Q 0 20 42 9 Q 0 31 42 9 Q 250mV 171429 ppm 7 4 ppm 0 36 36 ppm 0 63 36 ppm 1KQ WI 1 2 kQ 0 052 Q 0 15 0 32 Q 0 24 0 32 Q 25mV 17143 ppm 0 74 ppm 0 36 3 3 ppm 0 62 3 3 ppm 1002 3W 0 12 KQ 0 0052 Q 0 10 0 09 Q 0 17 0 09 Q 5002 3W ll 800 52 mo 0 15 320 mQ 0 24 320 mQ BRIDGES FULL 4 Active Gauges Gauge Factor 2 0 Voltage i 1000 3W 120 Q 5 2 mQ 0 10 66 0 mQ 0 17 66 0 mQ 2 5V 150000 pS 6 50 pS 0 00 35 pS 0 00 35 pS 109 3W Il 12 Q 0 52 mQ 0 15 43 mQ 0 24 43 mQ 250mV 15000 us 0 65 uS 13 00 3 2 us 13 00 3 2 us CURRENT 25mV 1500 uS 0 07 uS 15 50 0 28 uS 15 50 0 28 pS 25mA 30 mA 1 3 pA 0 16 7 pA 0 25 7 pA BRIDGES FULL 4 Active Gauges Gauge Factor 2 0 Current 2 5mA 3 mA 0 13 pA 40 16 40 7 pA 40 26 40 7 pA 29V 83114374S ve Ue 20 20 eee SOSA lt 5200 Ue 0 25mA 0 3 mA 0 013 pA 0 16 0 06 pA 0 25 0 06 pA eau 85714 pS 3 717 pS 20 29 eye 20 41 ies eaEQuENGY 25mV 8571 uS 0 37 pS 0 10 1 6 uS 0 17 1 6 uS 300kHz 300 kHz 0 0022 40 052 46 5 Hz 40 061 6 5 Hz BRIDGES HALF 2 Active Gauges Gauge Factor 2 0 C rr nt 30kHz 30 kHz 0 0022 0 052 0 65 Hz 0 061 0 65 Hz ZOV 857143 uS 37 14 Us oe one 20 69767 GO Be 3kHz 3 kHz 0 0022 0 052 40 065 Hz 0 061 40 065 Hz eon 8o71 HS Iri pS 0S MANS 2070RA a pl8 S 300Hz 0 3 kHz 0 0022 40 052 40 007 Hz 40 061 40 007 Hz com 867108 0 37 pS 0 30 1 6 pS
154. provides information about Datataker status channel data alarms and memory card operation You cannot program the Datataker from the display panel however you can issue pre defined commands by pressing a panel key combination function key List Key white the key is held down the display is in list edit mode In this mode you can access all displayable items using the Scroll keys Items that are not normally displayed will become visible and will be seen to be flashing on and off Pressing the Light key while the List key is held down toggles the display non display flashing state of the selected item Function Shift Key pressing this key in conjunction with one of the other keys F1 to F4 executes a user defined command sequence When pressed the display shows the four function key labels LED On e LEDOff N These are the default assignments When a function key is pressed the display identifies the key and its label Function 2 gt LEDOff lt Pressing List and Function Shift keys together will reinitialize the display controller if affected by noise or otherwise corrupted Setting 6WARN to any value has the same effect Function Keys Assign function keys by the command Kn label command sequence where n is the function key number label is the text up to six characters that appears on the display and command sequence is any set of space separated commands For example K2 Scan 1 r
155. r 1HSC input Channel Options on page 5 Appendix Geologger DT515 and DT615 Introduction The Geologger is functionally similar to the Datataker 505 or Datataker 605 see Appendix Datataker DT505 and DT605 on page 26 with the addition of an internal vibrating wire sensor support module All electrical and programming characteristics are identical except the Geologger models have an extra channel type n FW Frequency of Wire and a software speaker switch V The Geologger supports most vibrating wire gauges with resonances between 600Hz and 4 5KHz Vibrating Wire Support The Geologgers use a pulse to pluck the wire in a vibrating wire gauge The advantage of the pulse pluck method is that a fixed pulse is able to stimulate a wide range of gauges This greatly simplifies channel programming for the user The balanced pluck pulse is approximately 150uS long and up to 36 volts in amplitude The pulse has a current source characteristic that provides automatic cable length compensation Sensors on long cable will be pulsed with the same energy as those on shorter cables The Geologger has a high gain low noise signal amplifier with transformer coupling on the input The amplified signal is filtered using band pass filters 500Hz to 5KHz and a phase lock loop PLL to reduce frequency noise before the frequency is measured by a precision frequency counter to input multiplexer phase frequency
156. r type connection is by three wires as seen in wiring configs 13 and 14 on page 19 One or both of the external resistors can be active with full lead resistance compensation Scaling The Datataker scales all bridge channel types to a ratiometric form with units of parts per million Vout 108 Reading Bout _ ppm Vex where the Vout term is measured as a voltage while the Vex term is measured by a reference channel for voltage excitation but is calculated for constant current excitation To convert to other engineering units apply a Polynomial Span or use calculations see page 7 Strain Gauges Strain gauges change resistance when stretched or compressed and are commonly wired in a bridge The strain to resistance relationship is where AL and L are the length change and initial length and AR and R are the gauge resistance change and initial resistance G is the Gauge Factor a measure of the sensitivity of the gauge Typical foil gauges have a Gauge Factor of 2 0 which means that if they are stretched by 1 IC Temperatu re Sensors wiring configs 18 19 20 21 Page 17 Sensor Slope Pivot Tp Channel Factor Formula AD590 0K 273 15 Series resistor R Q9 RxC LM335 0K 273 15T Attenuation factor A AxC LM34 0F 17 78T Calibration factor C LM35 0T Calibration factor C The calibration factor is calculated from the pivot temperature Tp the temperature error AT and the t
157. ransfer of data to the card CARDID text assigns a card ID CARDID returns the card ID RUNPROG forces running of card program CTEST clears data and program and tests the entire card Card Identification You can name a memory card with the command CARDID abe text The abel text can be up to 40 characters of which the first 16 are displayed This text is shown on the lower line of the display when you insert the memory card It is also returned in response to the command CARDID Card Formatting New Cards are automatically formatted when inserted into the logger and are given the default CARDID xxxKB where xxx is the size of the memory card Card Processing Flow Chart When a memory card is inserted into the Datataker the subsequent processing and actions depends on the status of the memory card and the status of the logger The tests performed on the memory card by the logger and the actions taken as a result the tests is detailed in Appendix Memory Card Processing Flow Chart Programming from Cards A memory card can hold a Datataker program of up to 4090 characters Commands are entered into the Datataker in the normal way except that each line must begin with a semi colon The logger copies lines prefixed by a colon into the program area of an inserted memory card For example CSCANS CALARMS m n u P22 44 P24 13 ALARM1 1V gt 55 0 4DSO j ALARM2 5TJ gt 107 0 Temp Alarm RA5M 1V 5TJ 2HSC LOGON
158. rapid scanning Make sure that input channels for alarms or data logging are not being sampled more frequently than is necessary Setting the Power Mode P15 is used to set the power mode as follows P15 Sleep entry condition 0 Sleep only if battery powered default 1 Sleep if not busy 2 Disable Sleep mode When logger is awake and P15 0 the battery current is measured every second If less than 20mA is drawn from the battery because the battery is being charged from an external supply then sleep mode is not entered P15 1 allows sleep mode without testing battery current P17 sets the delay period in seconds that the Datataker remains awake after a COMS network keypad or wake terminal activity ceases The default is 30 seconds P20 prevents nominated schedules from waking a sleeping logger This is done using a disabling bit mask P20 bit map msb 765 4321 0 Isb Immediate 128 RZ alarms 1 RD schedule 64 X polled 2 RC schedule 32 RS statistical 4 RB schedule 16 RA schedule 8 The default is P20 0 which means that all schedules can wake the logger when they become due If for example P20 65 i e 64 1 then the RD and alarm RZ schedules will not wake the Datataker P20 does not disable schedules if the Datataker is already awake Powering the Multiplexer Power consumption can be minimised by powering down the input multiplexers of some models of Datataker while the logg
159. rature see page 15 Resolution is defined as the number of bits that the ADC uses to represent the analog signal The greater the resolution the smaller the changes in the input signal that can be resolved Sample Speed is the maximum rate at which analog to digital conversions can be done This must include any channels selection time settling time for the signal to stabilise and processing time if required Shield a conductor surrounding input signal wires that is generally connected to a data logger s ground The purpose is to shield the input signal from capacitively coupled electrical noise Such a shield provides little protection from magnetically induced noise Thermocouple a temperature sensing device constructed from dissimilar metals See page 15 Transducer a device which converts a physical parameter such as temperature into an electrical voltage or current It is usually a sensor with additional electronics for signal conditioning and scaling Voltage to Frequency Converter a device which converts an analog voltage into a train of digital pulses with a frequency proportional to the input voltage The frequency is then measured digitally This method which is used by the Datataker provides integration over the sampling time and good noise rejection Page 23 ASCII Decimal Equivalents special characters only acknowledge bell backspace tab line feed vertical tab form feed carriage
160. re settling delay changed 3 40 8 12 93 PCMCIA card capability added CTEST card check command added 3 42 26 04 94 Some bug fixes XON XOFF handling modified Day of year added accessed as 15SV 3 44 03 06 94 Some minor bug fixes 3 45 10 03 95 Fixed bug where logger can get several commands behind 4 00 01 09 95 Added support for hardware clock Added support for multiple insertions of memory cards for same program Changed some display messages for cards Added b for quote characters in alarm text Changed default function key settings Various bug fixes 4 01 and 4 02 Minor bug fixes 5 00 01 08 96 Version ID change for Datataker Series 2 loggers No changes to firmware Explanation The software built into the Datataker is referred to as firmware and is placed in Read Only Memory or ROM This ROM is mounted inside the Datataker on the lower circuit board and is socketed for easily replacement Please contact your dealer for more information about ROM upgrades Note When operating Datatakers in a network it is advisable that all loggers in the network be running the same firmware version Notes Page 34 Appendix Accuracy of the Datataker Data Loggers Page 35 ABSOLUTE ACCURACY ABSOLUTE ACCURACY Tolerance at 25 C Tolerance 20 to 70 C Tolerance at 25 C Tolerance 20 to 70 C Full of Plus of Plus Full of Plus of Plus Range Scale Units Resolution Units Full Scale Offse
161. requires 8 Channel Variables as follows RA1S 1TT H25 0 35 0 1 8CV This generates a histogram with 5 temperature classes with intervals of 2 as follows 1CV first class 25 to 27 interval counts 2CV second class 27 to 29T interval counts 3CV third class 29 to 31 interval counts 4CV fourth class 31 to 33 T interval counts 5CV fifth class 33 to 35T interval counts 6CV number of samples under range lt 25T 7CV number of samples over range gt 35 8CV total counts or sum of 1 7CV Then for example you can log the channel variables using another schedule RB1H 1 13CV R The histogram channel option does not affect the usual reporting or logging of the channel s readings Note There are only 100 Channel Variables so the number of channels that can be histogrammed is limited Page 6 Scaling Data and Calculations getting sophisticated Introduction The Datataker provides many different methods for scaling and manipulating channel readings Often a combination of methods is the most effective Automatic Scaling All channel types return data in engineering units volts amps ohms hertz and see Channel Types on page 4 Most sensors output one of these basic signals Channel Factor a tioating point number Many input channel types include a channel factor as an option This usually provides a linear scaling For example in 1V 1V 101 0 the first item 1V returns true millivolts a
162. return xon OONOURWNHO xoff colon semicolon not acknowledge escape gt mny IA e underline alarms 4 20mA Loop a common measurement standard in industry A transmitter controls a current in the range of 4 to 20mA as a function of a measurement parameter Any receiver s or indicator s placed in series can output a reading of the parameter Prime advantage is two wire connection and high immunity to noise pick up Generally powered from a 24 volts supply 50 60 Hz Rejection The most common source of noise is that induced by AC power cables This noise is periodic at the line frequency Datatakers are able to reject most of this type of noise by integrating the input for exactly one line cycle period 20 0 or 16 7mS Appendix Datataker DT50 Introduction Each model in the Datataker data logger range has a number of characteristics that differentiate it from the other models This page describes these characteristics for the Datataker 50 Analog Inputs e 5 differential or 10 single ended can be used in any mix Sampling rate 25 samples sec Input impedance 1MQ or gt 100 MQ selectable Common mode range 3 5 VDC Common mode rejection gt 90 db 110 db typical Series mode line rejection gt 35 db Sensor excitation of 4 5V 250 0pA or 2 500mA each channel Full half and quarter bridges voltage or current excitation Multiplexer type solid state C
163. riod mS 10mS 0 to 30 000 Time between channel selection and beginning of ADC see also 7SV on page 6 and ADC Details on page 18 Parameters can be set at any time P11 Mains frequency Hz 50 60Hz 48 to 1000 Sets ADC sample duration to 1 Hz seconds Default value read from the country DIP switch see 8SV on page 6 and new settings generally take effect P12 Transmit errors errors 0 0 to 30 000 Transmission errors in protocol mode see the Datataker Advanced Communications Manual immediately For example P13 Digital input sample period mS 50mS 0 10 to 100 Sample interval on digital inputs and keys on display determines minimum detectable pulse width P13 0 disables digital input P22 44 set Parameter 22 to 44 P14 Password timeout seconds 300S 1 to 30 000 When a password is defined the Datataker will automatically SIGNOFF after this period of inactivity see COMS Port page 13 gt P15 Low power operation mode 0 0to2 0 auto 1 force low power 2 force normal power mode see Setting the Power Mode page 15 Note that in fixed format mode see P16 ADC warm up time 100mS 1 100mS 1 to 255 Minimum time from wake up to first ADC in 100 s of milliseconds useful for sensors with a long power up settling time below three parameters are forced P17 Delay to low power mode seconds 30S 1 to 255 Delay to low power mode from last communications external wake or keypad input see Setting Power Modes page 15 P22 44 P24 13 and P38 46 The P
164. s etc Real time clock used for scan scheduling date and time stamping of data alarm timing and within calculations Measuring Ranges Page 31 Accuracy Input Type Range Units Resolution at 25 C DC Voltage 25 000 mV 1uV 250 00 mV 10V 2500 0 mV 100V 7 000 V 250V Note 1 70 00 V 2 5mV Note 1 100 00 V 10mV Note 1 Attenuated DC Voltage Any range mV DC Current 0 2500 mA 200nA Internal Shunts 2 500 mA 1pA 25 00 mA 10A External Shunts Any range mA 4 20mA Loop 0 to 100 Percent 0 01 Resistance 10 000 Ohms 1mQ 100 00 Ohms 1mQ 500 0 Ohms 5mQ 7000 0 Ohms 50mQ Frequency 0 1 to 300 000 0 Hz 0 01Hz Period 30 000 to 3 Sec 1S Vibrating Wire 500 00 to 5000 00 Hz 0 01Hz Note 2 Temperature 250 0 to 1800 0 Deg C 0 1 420 0 to 3200 0 Deg F 0 1 Strain Gauges 104 to 104 ppm 1ppm and Bridges 10 to 10 ppm 10ppm 108 to 106 ppm 100ppm Digital Bit Oor1 State 1 Digital Byte 4 5 bits 0 15 0 31 State 1 Digital Average 0 00 to 1 00 State 0 01 Counter 0 to 65535 Counts 1 Phase Encoder 32768 to 32767 Counts 1 Analog State Oor1 State 1 Polynomials 9 9e 18 to 9 9e18 User 0 0001 Linear Spans 9 9e18 to 9 9e18 User 0 0001 Calculations 9 9e 18 to 9 9e18 User 0 0001 Note 1 Datataker 505 605 and Geologger 515 615 only Note 2 Geologger 515 615 only Appendix Specifications cont Scanning of Input Channels e 1 immediate scan schedule can include one or more channels 4 rep
165. s a 2009 resistance at 0 The channel is labelled Steam Temp for output and FFO sets the output resolution to 1 The data is returned as Steam Temp 266 DegC instead of the default 5PT385 265 7 DegC Channel Options geste Provides input bias current path Defaults ON for most differential inputs and off for single ended types Input impedance gt 100MQ Signal source must provide input bias current path approx 5nA Default resistance amp constant current bridge BGI measurement method is by a three wire method Four wire method is usually more accurate Input applied between or or and SE Ref Single Ended Reference terminals Input applied between or or and GND or R The Datataker applies a 2 500V offset to GND Ground currents can cause small errors Inhibits auto ranging and presets amplifier gain to 1 10 or 100 respectively Controls attenuator on DT5x5 6x5 models A switches attenuator in and NA switches attenuator out See Appendices re DT505 605 and DT515 615 Provides a voltage equal to the input common mode voltage via approx 3KQ For high impedance signal sources where cable leakage is a problem Useful for powering some sensors however it is not regulated and is likely to drift with temperature a Default current source for Resistance measurement Very stable over environmental temperature randall These conditions are established 10mS before Default source for RTD and bridge measurement Very stabl
166. s a thermocouple can be read once or read multiple times as in the next example amp 2TT 449 3 DegC RA1S 2 4TT returns data in the default format in this case everyone _____ gt 2TT 451 5 Deg C x second RA1S for three thermocouple type T channels 3TT 563 2 Deg C Channels page 4 ATT 287238 Deg C 2TT 451 9 Deg C Sensors can be wired to channels calibrated and tested prior to full program entry n u P22 44 changes the output format in this case channel number and 452 0 565 4 451 0 units are disabled and data separator is ASCII 44 the comma 452 3 566 2 450 5 Sample Program Comments can follow the apostrophe character up toa carriage return Boiler monitoring program for the Datataker 600 Author Henry Higgins 23 4 95 _ Commands Only upper case characters are accepted CSCANS CALARMS CLEAR CDATA Commands must be separated by one or more spaces or carriage returns and are not processed until a carriage return is received Switches page 11 determine system function upper case is ON and lower case is OFF n u S e P22 44 lt Y10 4 5 0 213 KPa 1 0 50 0 100 L m ALARM1 1V gt 2 25 3DSO ALARM2 4TT gt 110 0 3DSO 1DSO Over temp RB5S Alarms page 9 detect out of ALARM3 4TT lt 100 0 RB1M range conditions Can also be used to change logger function schedule BEGIN timing control outputs and event annunciation RB1M 2
167. s are suitable for applications in industry science agriculture the environment hydrography and the public utilities Features Comparison of the Datataker Data Loggers Page 30 The Datataker data loggers can be installed locally and communicate directly with a local host computer or can be installed in remote locations and communicate to a base host computer by various telemetry options including PSTN cellular networks and radio The Geologger 515 and 615 data loggers have the same specification as the Datataker series However these loggers also support vibrating wire strain gauges which are the active elements of a wide range of pressure sensors load sensors displacement sensors etc that are commonly used in geotechnical mining and structural applications Datataker 50 Datataker 500 Datataker 600 Datataker 505 Datataker 605 Geologger 515 Geologger 615 Analog Channels Differential 5 10 10 10 10 10 10 or Single Ended 10 30 30 30 30 30 30 Multiplexer Solid State Solid State Solid State Relay Relay Relay Relay Resolution 15 bit 1pV 15 bit 1pV 15 bit 1uV 15 bit 1pV 15 bit 1pV 15 bit 1uV 15 bit 1pV Common Mode Range 3 5V 3 5V 3 5V 100V 100V 100V 100V Volts Current 4 20mA Resistance Vv Vv Vv Vv Vv Vv Vv Frequency Period Vv Vv Vv Vv Y v v Thermocouple Support 11 types 11 types 11 types 11 types 11 types 11 types 11 types RTD Support Pt Cu Ni v Vv Vv Vv Vv Vv v Bridges Strain Gauge Support Vv Vv Vv Vv Vv v v
168. sensors Single Ended VW Connection As can be seen in the diagram shielding is the same as for the differential connection The single ended input arrangement functions best where cable lengths are relatively short say lt 100 meters gauges have good sensitivity signal to pluck ratio Because of the great range in gauge sensitivity it is difficult to predict the operating limits We suggest that for cable lengths in excess of 100 meters that test be conducted with the gauges to be deployed Programming VW Channels Channels connected to vibrating wire gauges are supported by the nFW channel type see Channel Types on page 4 This channel type tells the logger to configure the channel for vibrating wire pluck the sensor and to measure the frequency returned For example the following differential channel specifications 1FW 5 8FW will return 1FW 3056 7 Hz 5FW 1896 4 Hz 6FW 2035 7 Hz 7FW 1705 5 Hz 8FW 1769 2 Hz as data on channels 1 5 6 7 and 8 Single ended channels are specified by adding a terminal identifier 2 FW 2 FW 2 FW will return 2 FW 4597 8 Hz 2 FW 4445 2 Hz 2 FW 3909 7 Hz where the and indicate gauges connected single endedly between the return terminal and and terminals respectively Readings can be scaled into engineering units using the Geologgers functions spans polynomials and calculation facilities See Scaling and Calculations on page 7 Troubl
169. source 2 current 1pA to 500pA PASS test pass or fail Test data that is out of range is flagged with a fail message Use the u switch to make test results less verbose TESTn returns line n of the test results and TESTnR produces continuous test cycles of line n Continuous reporting is stopped by the next carriage return RESET The RESET command clears the Datataker of all data and programs Use it carefully or risk losing valuable data The RESET command also initiates a calibration and a sign on message is returned to the host computer Datataker 0 Version 5 xx Initializing Done The RESET command does not clear the Datataker clock or clear data or program from a memory card Do not send any other commands to the Datataker for five seconds after you have entered the RESET command Use Wn in DeTerminal to force a pause after RESET in a command file for example RESET W5 CDATA STATUS The STATUS command returns the status of the Datataker s schedules channels alarms memory and logging to the host computer Typical returned information Datataker 0 Version 5 xx A none Scan Schedules Active Halted 0 0 Alarms Active Halted 0 Polynomials Spans Defined Logging is OFF 13650 0 Internal Data Points Free Stored 169260 0 Card Data Points Free Stored 4090 0 Program Characters Free Stored B C da E h T K 1 M N 0 Q r S t U v w x y Z The first line shows the Datataker s address see Networking on page 14
170. st is able to receive then the host can transmit an XOFF character Within two character periods the Datataker will stop data transmission giving the host time to process its buffered data When the host is again ready to receive data it should transmit the XON character allowing the Datataker to resume transmission A logger in XOFF mode can also auto XON see P26 on page 11 The Datataker also issues an XOFF when its input buffer is 50 75 and 90 full and an XON when the input buffer is empty Special Commands The Datataker has three serial interface commands to assist in managing communications AZCMSRST will clear the input and output buffers and set XON AZSXOFF will XOFF the Datataker AZQXON will XON the Datataker The last two commands allow remote loggers to be XOFF ed and XON ed without modems in the link consuming the commands Loading a Program The Datataker s input buffer is 250 characters long and a burst of 250 characters without a pause between characters is possible A single command line must be less than 250 characters The Datataker begins to process the input buffer when the first carriage return is received A full 250 characters of program takes up to 500mS to compile if the Datataker is not scanning and up to 5 seconds if it is running long schedules and many alarms Any digital assignment delay periods such as 1DS0 1000 0 add to this time The host must ensure that the Datataker has sufficient
171. statistical data is required for a channel then each statistical option must be placed in a separate option list see Multiple Reports on page 4 1TT AV SD MX The trigger for the statistical sub schedule is defined in the same way as for the main scan schedule see Triggers beside using the RS identification If you do not specify the RS schedule s trigger the sample rate will be as fast as possible You may change the RS schedule at any time RS10S sample every 10 seconds RS30M _ sample every 30 minutes RS1 E sample on each 1 to 0 transition of digital input 1 RS sample as rapidly as possible If the statistical sub schedule is halted by a HS command then statistical sampling of channels is stopped and the reported statistical summaries do not include data from this halt period This is most significant for the integral summary If statistical channels have not been scanned before they are reported then these channels report error E53 see page 21 and data is set to 99999 9 This condition can occur when the RS trigger is an event the statistical sub schedule has been halted or a statistical scan interval is longer than the reporting time interval An example of a schedule including statistical sampling is RA1H RS10S 1TT 2TT AV MX which returns three temperature readings a spot reading each hour of channel 1 and the average and maximum over the hour from 10 second samplings of channel 2 Synchronize to Midni
172. statistical sub schedule is due at the same time as the reporting schedule the channels are scanned statistically prior to reporting You cannot change this order Channels within schedules are sampled in the order of entry The RX polled schedule is scanned after the receipt of each X command Changing a Schedule Trigger You can change a schedule s trigger at any time simply by entering a new schedule ID and trigger without a channel list as follows RC10M 2W If you include a channel list then a new schedule is created which replaces all previous schedules unless these previous schedules have logged data into memory or logging is enabled by the LOGON command see page 8 or the schedules are locked by the F switch see Switches on page 11 Halting amp Resuming Schedules Schedules can be halted individually or as a group H Halt all schedules including alarms HA HB HC HD Halt RA RB RC or RD schedule HS Halt the statistical sub schedule HZ Halt the alarm schedule The polled schedule RX cannot be halted HX will generate an error message Corresponding commands for resuming or Going the schedules are G GA GB GC GD GS and GZ Locking Schedules Schedules can be locked by the F switch command to prevent them from being accidentally changed or deleted The schedules can be unlocked by the f switch command Clearing Schedules The command CSCANS erases all schedules However if any schedule s has stor
173. sults are to be tested then Channel Variables provide the only means of using statistical results in alarms For example the program RZ1M RS1S RA1M 3TT SD 1CV W ALARM1 1CV gt 0 1 Excessive variability tests the standard deviation of the temperatures read over each minute When input channels or Channel Variables are used in intermediate steps of a program then the W channel option can declare these as working channels and prevent data being returned logged or displayed During program debugging the W option can be over ridden by the W switch see page 11 to return and display intermediate data Calculations ony at report time The Datataker has a powerful expression evaluation capability Results can be assigned to Channel Variables output channels System Timers and System Variables Expressions can ONLY contain Channel Variables and constants Data from input channels must first be assigned to Channel Variables to be used in expressions Expressions can contain the following operators Arithmetic modulus and exponent Relational lt lt gt gt result 1 is true 0 is false Logical AND OR XOR NOT gt 0 is true result 0 or 1 Functions ABS LOG LN SIN COS TAN ASIN ACOS ATAN SQRT Yn S n0 Other Parentheses Page 7 Note The trigonometric functions require arguments in radians where 1 radian 57 296 degrees The operator precedence is
174. t Units Full Scale Offset Units Range Scale Units Resolution Units Full Scale Offset Units Full Scale Offset Units VOLTAGE RTDs 4 Wire 100V 642 V 28 0 mV 0 26 150 mV 0 31 150 mV Pt100 1009 lt 51 C 0 01 C 0 10 0 07 C 0 17 0 07 C 50V 64 2 V 2 8 mV 0 26 14 mV 0 31 14 mV Pt100 5009 51 600 C 0 13 C 0 15 0 73 C 0 24 0 73 C 5V 6 42 V 0 28 mV 0 26 1 2 mV 0 31 1 2 mV Ni1000 7K C 0 10 C 0 20 0 56 C 0 31 0 56 C 2 5V 3000 mV 130 uV 0 06 700 uV 0 16 700 pV Cu135 5009 C 0 14 C 0 15 0 73 C 0 24 0 73 C 250mV 300 mV 13 pV 0 06 63 pV 0 17 63 pV BRIDGES FULL Voltage 25mV 30 mV 1 3 pV 0 06 5 7 pV 0 16 15 7 pV 25V 600000 ppm 26 ppm 0 00 140 ppm 0 00 140 ppm RESISTANCE 250mV 60000 ppm 2 6 ppm 0 05 13 ppm 0 07 13 ppm 7KQ 4W 8 kQ 0 52 Q 0 20 42 0 Q 0 31 20 Q 25mV 6000 ppm 0 26 ppm 0 10 1 2 ppm 0 12 1 2 ppm 1KQ 4W 1 1 2 kQ 0 052 Q 0 15 0 26 Q 0 24 0 26 Q BRIDGES FULL Current 100Q 4W 1 0 12 kQ 0 0052 Q 0 10 0 023 Q 0 17 0 023 Q 2 5V 3E 06 ppm 150 ppm 0 16 800 ppm 0 33 800 ppm 500Q 4W II 800 Q 52 mQ 0 15 280 MQ 0 24 280 MQ 250mV 342857 ppm 15 ppm 0 16 72 ppm 0 34 72 ppm 1009 4W Il 120 Q 5 2 mQ 0 10 26 mQ 0 17 26 MQ 25mV 34286 ppm 1 5 ppm 0 16 6 5 ppm 0 33 6 5 ppm 10Q 4W II 12 Q 0 52 mQ 0 15 23 MQ 0 24 42 3 MQ BRIDGES HALF Current RESISTANCE 3 Wire Compensation Lead Resistance 109 25V 2E 06 ppm 74
175. t compatible digital input channels for digital state and byte input 10 Digital output for digital state and byte output 5 contact closures rated 110Vac dc at 5A 5 open collector outputs rated to 200mA at 30V All analog channels may also be used as digital inputs with a user definable voltage threshold Note the expansion module digital inputs do not support any counter channel types Module Installation The expansion module is connected to the Datataker via the 25 way expansion connector on the end of the logger s case A 50 cm 1 6 feet ribbon cable is provided Additional expansion modules can be chained end to end Se Expander 2 Expander1 Datataker Up to 2 Channel Expansion Modules may be connected to a Datataker The total cable length must be less than 2 meters 6 feet Before you install an expansion module disconnect mains power and all batteries from the Datataker After module connection power up the Datataker and the new channels will become available The first line returned by the TEST command will reflect the new hardware configuration A 6 indicates a Channel Expansion Module Channel Addressing Channel addressing on the expander follows the normal Datataker conventions except that an expander prefix is added The prefix is the module number and a colon The module connected to the Datataker is module number one the next module in the chain is number two Some examples
176. t in most situations and so in practice the reference junction is allowed to follow to ambient temperature However this non zero reference junction temperature must be compensated for by measuring the reference temperature with a different type of temperature sensor This correction can be made in hardware or as with the Datataker in software The software approach allows support for any thermocouple type without hardware dependence Isothermal Block Generally the reference junctions are held at the same temperature by a physical arrangement that ensures good thermal conductivity between the junctions This structure is called an isothermal block It is advisable to insulate the isothermal block from rapid ambient temperature changes Thermocouple Types The Datataker supports all of the commonly recognised thermocouple types Type Positive Negative Range Pt 30 Rh Pt 6 Rh 300 to 1700 W 5 Re W 26 Re 0 to 2320 W 3 Re W 25 Re 0 to 2320 Ni 10 Cr Cu 45 Ni 200 to 900 w W 26 Re 0 to 2320 Fe Cu 45 Ni 200 to 750 Ni 10 Cr Ni 2 Mn 2 Al 200 to 1250 Ni 14 Cr 1 Si Ni 4 Si 0 1 Mg 200 to 1350 Pt 13 Rh Pt 0 to 1450 Pt 10 Rh Pt 0 to 1450 Cu Cu 45 Ni 200 to 350 Each type has characteristics sensitivity stability temperature range robustness and cost that make it appropriate for particular applications Thermocouples on the Datataker Thermocouples are wired to the Datataker as for any voltage signal
177. tervals we 10000 tt ot oot ot ot tox Ff 3 1 year J ERA 4 T J 4 a aK S 10 channels J 4 Je 5 1000 as aik J 1 month 20 channels 3 Fmonh 7 ri 1 week 10 channel line es E 1K a X example FJ Hareek font x 100 A 100 a 30 channels a g if D 1 day 2 4 3 leg week D j J day a 5 10 g yo J lady s 4 g Bi 8 4 a 3 ae E 10 a 1 eT o dap a a a y 1 minute 1 hour 1 day A 1 10 100 1000 10000 100000 Scan Interval In Seconds Battery Life in log scale Hours for Three Using the Battery Life Chart Establish the scan interval and locate it on the Scan Interval axis The chart shows an example of 30 seconds Project a vertical line to the curves The curves correspond to different numbers of channels Interpolate if necessary The channels are assumed to be analog For this estimation a digital channel is equivalent to one quarter of an analog channel Project a horizontal line from the curve intersect to the right across the three scales that correspond to standard Datataker battery sizes From the appropriate scale read the battery life For the example on the chart the battery lives are 300 800 and 4000 hours for 1 2 4 and 17 Ah batteries If you use a non standard battery then look at the chart axis on the left The battery life is equal to the scale value 220 hrs for the example multiplied by the battery s amp hour rating Some Details The Datataker takes approximately 300mS to wake up
178. that a PASSWORD see opposite be used for link security and to protect the logger from garbage characters created when the link between the modems is disconnected The DTR input to the Remote Modem must be asserted This is done in the cabling by tying DTR high by a DIP switch setting on some modems or by using the AT amp DO command Enter the following commands into the Remote Modem with a computer running DeTerminal or other communications program These commands are typical however some modems may need different commands for some of these settings The text in the brackets are comments and should not be entered AT amp F Set factory defaults AT amp DO Ignore the DTR signal AT FO Xon Xoff flow control CTS RTS cannot be used ATS0 2 Auto Answer after two rings other values are OK ATQ1 Disable response codes CONNECT OK etc ATEO Disable echo ATY1 Enable Break disconnect AT amp WO_ Save settings in User Profile 0 sometimes AT amp W It is important that the RS232 port of the Remote Modem is locked to a baud rate 4800 baud is recommended Two command possibilities are shown below Please consult your modem manual for the exact commands AT amp L7 Sets modem to the Datataker default of 4800 baud or ATNO Set baud rate to that nominated by S37 ATS37 8 S37 defines 4800 baud For a more comprehensive discussion about use of modems refer to the Datataker Advanced Communications Manual If the R
179. the terminal to the amplifiers input This patching is achieved by defining the channel number and type see page 4 For example a differential voltage on channel one is patched by the channel definition 1V Single Ended Input A single ended input also provides a signal voltage between two wires except that one of the wires must be at ground potential On the Datataker this grounded wire is connected to the channel s R terminal R for return The other signal wire is connected to any one of the other three terminals To patch a single ended channel the channel number is given a suffix indicating the terminal to which the second wire is connected For example a single ended voltage input applied to channel one between the R and terminals would be patched by the channel definition 1 V You can apply three single ended inputs to each Datataker channel These use the suffix s and asterisk Thus the three single ended voltage inputs on channel one would be 1 V 1 V and 1 V Note that the single ended input in not supported on the DT50 Sensor Excitation Many sensors require power or excitation to enable them to output a signal For example to read the temperature of a thermistor a temperature dependent resistor excitation current is passed through the thermistor to generate a voltage drop that can be measured The Datataker has three different excitation sources 250A 2 50mA and 4V These are output on the e
180. to a flow rate sensor 5 0 0 1 0 1000 litres 3F Fuel Consumption S5 INT integration returns the volume of the flow Fuel Consumption 34 54 litres Int The flow rate sensor with a frequency output 3F is scaled by a span S5 see Spans on page 7 and then integrated Note that the span units have been declared as litres which is the result after integration although the span calibration is actually to litres per second Histogram Hx y n mCV You can use the Datataker to generate a histogram frequency distribution of channel samples When you attach the histogram option to a channel the channel value is returned at report time and the respective channel variables are incremented Then you use another schedule to read log and clear the channel variables classes a class interval gins Number of occurrences counts x Channel reading y A histogram is specified as a channel option with the following format Hx y n mCV where x is the lowest channel reading of interest y is the highest channel reading of interest y gt x n is the first Channel Variable nCV to store counts m is the last Channel Variable mCV to store counts Three other counts are also stored as follows m 2 CV number of readings under range lt x m 1 CV number of readings over range gt y mCV total number of readings including those out of range For example to histogram a temperature channel over 5 classes
181. to double ended or differential channels and SE refers 4 loft otf Jo factory setting A zo2cAZAZA2A2AAZA2AA to single ended channels see Glossary on page 23 Accuracy is 5 Joff off jon RR L nonea SSS expressed as percentage of reading at 25 see page 17 i oi on jo s1 o on Jo met 8 loff off o US 60Hz on Digital Inputs and Outputs 9 off off on Other 50Hz off Channel Expansion 4 TTL CMOS compatible digital input channels for digital state 10 Joff on o Internal Battery Connector digital events low speed counters 10 Hz 16 bit presettable 11 Joff on jon 110 mm Connector Digital input terminals are shared with digital output channels 12 off off jo Baud Rate s2 s3 s4 Add Range Height without memory card 85mm 4 Digital open collector outputs rated to 200mA at 30V 13 off off Jon _ 1200 offl off x 0 31 with memory card 105mm 3 high speed counters 1KHz or 1MHz 16 bit presettable 14 off on off defaut os00 ott onlott 0 15 lil All analog channels may also be used as digital inputs with a 15 off on jon 300 off on on 0 15 On user definable threshold 16 fon off o 2400 jonjoff x 0 31 eee Input Type Channels Range x is on off on 4800 onjon x 0 31 D Digital Bit 4 Oor 1 State eae Ballas x don t care Digital Nibble 1 0 to 15 State Ee i ES coinier 4 65535 Counts z a aa Be S Country Setting 3 R R R R R R HS counter 3 65535 Counts 5 e Country Setting determines the Memory Card S
182. ual A Concise Reference UM 0046 A0 Data Electronics Aust Pty Ltd 1991 1996 Contents Page 1 Getting Started More Getting Started Schedules Channel Types Channel Options Time and Other Channels Statistical Operations Scaling Data and Calculations Data Logging and Retrieval Memory Cards and Programs Alarms Output Format More Commands Parameters Switches Display Panel Operation COMMS Port Networking Power and Battery Connection Sensors 1 Thermocouples Thermistors RTDs Sensors 2 Hints IC Temperature Sensors Bridges Sensors 3 Other Subjects Analog Input Configurations 1 Analog Input Configurations 2 Digital Configurations Error Messages Simplified Circuit Glossary Appendix Datataker DT50 Appendix Datataker DT500 and DT600 Appendix Datataker DT505 and DT605 Appendix Geologger DT515 and DT615 Appendix Channel Expansion Module Appendix Memory Card Processing Flow Chart Appendix Datataker Specifications Appendix Firmware Change History Notes Appendix Accuracy of the Datataker Data Loggers Index Getting Sta rted also see the Getting Started with Datataker User s Guide The Datataker The Datataker data logger is a tool to measure and record a wide variety of parameters in the real world With the Datataker simple tasks are easy For example entering in the command line RAD5S 1 5TJ LOGON return declares a reporting schedul
183. ultiplexer is powered down while the logger is in the sleep state For the Datataker 50 this is set using DIP switch s4 The factory preset is for the multiplexers to power down while the Datataker 50 asleep The current saving is approximately 150A which is the current draw of the 4 CMOS multiplexer integrated circuits CD4052 See Multiplexer Powering on page 15 for more details on the this subject permanent switched Accress ssfss s7 se s8 amp Datataker 50 Address 0 off off pff off The Datataker 50 can be given 1 Jo al off on an address however it is not 2 loff lofflon off particularly useful because the 3 loft loff lon on logger does not support networking 4 off Jon loff o The only use for an address on 5 off lon loff on a Datataker 50 is for identification 6 loff lonlon Joff using the STATUS or STATUS1 7 loff onlon lon commands The first line returned 8 on loff loff loff by these commands includes the 9 Jon Joffloff on address See STATUS command 2 10 Jon off lon off on pages 10 and 22 41 Jon off lon Jon Note The Dip switch position 12 lon lon loff joff five is unavailable if 300 or 9600 13 Jonlon otf lon baud rates are selected This 8 14 lon lonlon oft halves the address range to 0 7 15 Jon jon jon jon Power Consumption The Datataker 50 will consume very little power if it is allowed to sleep Less power is consumed if the Datataker 50
184. uncate 2 11 and 2 12 20 9 91 Minor bug fixes 2 90 to 2 99 24 12 91 Significant Rev Memory card changes incompatible L U Z switches changed UNLOAD selectable from card or internal STATUS10 13 added Several ALARM bugs fixed 3 00 24 12 91 Consolidation Release Old checksum UNLOAD P removed Network performance improved 3 01 to 3 05 15 5 92 DT505 support added Vibrating wire sensor support added Internal channel addressing change 2 V ES extra samples channel option added Baud rate switch function changed slightly J V X switches added Serial port commands added CEM support added Repeating ALARMR added 3 10 4 6 92 Allow program to be placed in EPROM New switch A to control ALARMs display ES9 default channel option for FW channels P7 network turnaround time for radio links P22 maximum number of significant digits 6WARN for backlight without flashing added 3 11 15 6 92 1 5 addressing bug fixed Modification to 3 wire calibration 3 12 to 3 24 21 10 92 Various bug fixes Appendix Firmware Change History 3 30 15 2 93 Reduced lower frequency limit to 0 1Hz Modify scaling of bridge channel types Baud rate selection change TEST command extended System timers synchronised if time reset Grey code function F7 added P21 data return address added 3 31 25 3 93 P33 field width added 3 32 to 3 36 1 7 93 Various bug fixes Bug fix to analog readings following delay 4 20mA current loop restriction removed Vibrating wi
185. uts both employ 10KQ pull up resistors to 5 volts allowing the use of voltage free contacts The thresholds are lt 1 5V for a 0 and gt 3 5V for a 1 During sleep mode the digital inputs are inoperative however the high speed counters remain active Example above also shows wiring for the one phase encoder up down counter Digital and Counter Input Digital Output gt Power 2 Supply ca Ground The bidirectional digital channels can sink 200mA from up to a 30 volt supply The solid state switch is not protected against sustained over currents For inductive loads parallel reverse diodes are recommended although not essential as the Datataker has internal transient protection Relay Connection Externally Powered Example Digital 3DSO 1 The internal 5V switched off in sleep mode supply is limited to approximately 100mA The saturation ON voltage drop of the switches is 1 volt so the relays must be able to activate at 4 volts over the expected temperature range Relay and LED Connection Internally Powered PKZ Examples 5 AS II 1 2 5 AS 3AS 1500 Externally Internally powered powered The power source must be able to provide sufficient voltage to exceed the Analog States s threshold which defaults to 2500mV Ensure input voltages do not exceed Datataker s common mode range Digital Input via Analog Inputs AD590 AD592 18 Attenuated Diff
186. v 1 with auto gain select tne frequency measurement Network Il models input for single ended input 7 a ne nae etwork is not on all mo Neneh R allow 1 10 amp 100 see page 5 _ 64180 Network al The ground terminals should not 0 1 Microprocessor RS485 Not shown in the simplified circuit with 9MHz clock interface al Q be used for signal referencing except for current return paths Grounds can be electrically noisy and have an offset relative to the Return terminals 0 1 Schmitt input buffer with threshold approx 2 volts 5V Pull up resistor 100K High Speed Counter 100KQ are the calibration facilities and hardware testing arrangements Precision three wire compensation circuit for resistance measurement and half bridge completion for bridge measurements These compensate for all offsets leakages component tolerances and drifts due to aging and temperature changes Three 16 bit counters These Channels 2V threshold see HSC on page 4 OF 1HSC has a square wave overflow output that can be applied to the input of another counter The 1HSCO n output channel assignment sets the counter s divisor to n with n 1 to 65 535 ae vi Pull up resistor 500K is possible Digital Input DS and DB 100K This capacitor provides input V filtering and limits count rate to approx 1KHZz If it is removed are fully operational while the
187. v Memory Card data points stored Clearing Stored Data You can clear logged data anytime with the commands CLEAR clears all data logged in the internal memory and disables logging LOGOFF CLAST clears data in internal memory or memory card card that has been unloaded by U command i e only if all schedules were unloaded CDATA clears all data logged in memory card RESET clears internal memory and program but not memory card data or program The CLEAR command may appear to fail if logging is enabled because new data is logged soon after the clear The solution is to first stop the logging with LOGOFF or H Introduction The Datatakers support PC Card memory cards which conform to the PCMCIA Type II standard PC Card memory cards of up to 1Mbyte in capacity can be used The memory cards increase the storage capacity of the Datataker and because the cards are removable they are also a reliable media for transporting data and programs For maximum reliability do not expose the memory card to temperatures over 45 T for extended periods to ionising radiation or to static electricity discharge Replace the lithium battery annually using the same cell or another cell recommended by the card manufacturer Card Specific Commands There are seven commands specifically for managing memory card operation CDATA clears card data CPROG clears program space on a card COPY transfer internal data to the card NOCOPY disables t
188. voltages only apply to unselected channels While a channel is actually being read a process that typically takes 30mS these withstanding voltages are reduced to that of the return terminal Digital Inputs and Outputs 4 TTL CMOS compatible digital input channels for digital state digital events low speed counters 10 Hz 16 bit presettable Digital input terminals are shared with digital output channels 4 Digital open collector outputs rated to 200mA at 30V 3 high speed counters 1KHz or 1MHz 16 bit presettable All analog channels may also be used as digital inputs with a user definable threshold Input Type Channels Range Digital Bit 4 0 or 1 State Digital Nibble 1 0 to 15 State LS counter 4 65535 Counts HS counter 3 65535 Counts COMMS Pott aso page 13 The Datataker 505 and Datataker 605 COMMS Port is serial RS232 compatible The output signal level is approximately 4 Volts allowing communications over distances in access 100 meters at 1200 baud Greater distances are possible at 300 baud The maximum practical distance is also dependent on the host computer s RS232 characteristics Note the RS232 standard specifies 2000pF maximum cable capacitance and no maximum distance The Datataker 505 and Datataker 605 COMMS Port is electrically isolated to 500V RS232 COMMS Connector Power Supply and Battery The Datataker 505 and 605 can be powered as follows Source Terminal Termina
189. witches LEDs 1 and 2 ON and LED 3 OFF The buzzer is controlled by 4WARN and the display back light by 5WARN These both pulse about twice per second when ON 6WARN controls the display back light but without flashing Displaying Channels When you display channel data the top line of the display shows the channel identification The default is the channel number and type If a channel identification text has been entered as a channel option then the first 16 characters of that text is displayed The bottom line on the display shows the most recent reading as a numeric value or bar graph See examples to the right If the channel has not been sampled the display shows Normally displayed channels are only up dated at report time The X switch allows the progressive display of statistical channels at the statistical scan time By default all scheduled channels are available for display and are displayed To stop display of a channel include the ND option in the channel s option list For example 1V ND won t display data in normal or list edit modes You can declare channels as intermediate working channels with the W option This makes those channels unavailable for display logging or returning to the host computer while the W w switch is set to the default w Setting the switch to W allows normal display and returning to host but not logging Displaying Alarms When you display alarms the top line of the
190. work If each host is simply polling for data with immediate schedules see page 3 operation is predictable If you enter repeating schedule types RA RB RC or RD then the data generated by these schedules will only be available to the host that issued them Addressing Datatakers The host may issue commands to any Datataker by placing an address prefix at the beginning of a command line n commands send commands to logger n commands send commands to all loggers e g 5 RAIM 3V will command logger 5 to return to the host the voltage on channel 3 every minute Take care in using the global address when the command returns data as the data from the loggers may be mixed and not easily separated The global address is particularly useful for setting the time switches and parameters on all loggers T 11 23 30 N c u L P22 44 The address is optional for commands to the local logger Remote loggers must be addressed Identifying the Data Source L Data returns by to the COMS port that made the request unless changed by P21 To identify the data source it is recommended that all loggers in the network are issued with the L switch so that all Datataker responses have the logger address at the beginning of each schedule s returned data For example for channels 1 3TT with switches set to n c u L and P22 32 i e space the default the returned data will have the following format 19 25 6 45 8 32 7 If
191. xcite terminal of each channel when the channel is read This action is automatic for most sensor types but may also be evoked as a channels option Analog to Digital Conversion The Datataker converts its input signals to a frequency and then measures the frequency over one line cycle period 20 00mS or 16 67mS This method provides high noise rejection and good signal averaging over the sample period Many sampling parameters can be adjusted by means of channel options page 5 switches and parameters page 11 These include calibration settling time sampling time and extended or multiple sampling The default values of these parameters are suited to the majority of sensors See ADC Details page on 18 For the Technically Minded To gain an understanding of how your Datataker works study the Simplified Circuit on page 22 This will help you to exploit many of Datataker s features More Getting Started more compulsory reading Schedules page 3 A schedule is a list of channels preceded by a scan trigger specification As a general rule don t read channels more frequently than is really necessary for example temperatures generally change slowly so rapid reading does not provide extra information You can declare up to four different schedules each with a different scan trigger based on a time interval or a digital input event The schedule s trigger can be changed at any time This allows the trigger to be m
192. y by the following Parameters and Switches see also page 11 H_ fixed format mode defaults off see Advanced Coms Manual U include units text appended to the data defaults on IN _ include channel number and type ID before data defaults on L _ include logger number before scan data defaults off I C _ include channel type C or number only c defaults on D_ include scan date at beginning of returned data defaults off T _ include scan time at beginning of returned data defaults off P22 data delimiter in u mode default 32 a Space P24 scan delimiter in u mode default 13 a Carriage Return Note A Line Feed character ASCII 10 is always added to a Carriage Return ASCII 13 P31 date format see Date on page 6 P32 maximum number of significant digits 0 to 9 default is 5 P33 defines a fixed field width for output data default 0 variable P38 decimal point locator character for floating point numbers default is ASCII 46 a period P39 time format see Time on page 6 P40 time separator character default is 58 a colon The default data format is verbose and descriptive for example RA5S 1V 3PT385 1C Widgets T D returns Date 25 12 92 Time 12 45 00 1v 2 490 Volts 3PT385 395 0 Deg C Widgets 3498 Counts where the Switches default to U N C Parameters P22 and P24 are not used as delimiters while units text is enabled U Howev
193. y should be placed in the same schedule before the thermocouple channels to which they apply as in the following example RB15M 1PT395 TR 2V TZ 3 5TT which assumes an external isothermal block with its temperature measured on channel 1 and electrical zero on channel 2 4AnDZAcQOMINODW Grounded Thermocouples Frequently thermocouple measurement junctions are electrically connected by welding brazing soldering or by contact to the object being measured This is only possible if the object is grounded to the Datataker s ground however this may introduce a troublesome ground loop that can allow significant series mode noise to affect readings This effect can be minimised by using differential connection eg 1TK or single ended connection with the S E Ref terminal connected to the grounded object eg 1TK X A ground loop via the COMS port and host computer is the most common cause This can be prevented by isolating the interface see COMS Port on page 13 Ideally all grounds should be connected to a single common point Accuracy The accuracy of temperature measurement with thermocouples is dependent on the reference junction isothermal characteristics reference temperature sensor accuracy induced electrical noise quality of the thermocouple wire drift in the wire especially at high temperatures basic measurement accuracy of the Datataker linearisation accuracy of the Datataker

UM-0046-A0 - DT500 Concise Users Manual

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