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1. Maximum Delay Time There must be no more than a 2 second delay between successive characters transmitted from a host computer or terminal If there is more than a 2 second delay the first character after the delay will be accepted as the first character of a new command ie the buffer receiving the input characters are cleared after a character timeout has elapsed Framed ASCII Protocol This protocol requires that all command strings be initiated with a colon and terminated with a carriage return The command will only be responded to after the receipt of both the colon and carriage return On receipt of the frame start character a new message is started and any unterminated commands are cleared The unit will not execute any command if it was not commenced with a colon All responses sent from the instrument will be terminated with a carriage return and a line feed Echoing Commands The instrument operates in half duplex mode where the command strings are not echoed back to the host computer Response Times As the whole string or command is processed at one time after having received a carriage return the response time from previous versions is much improved Regardless of the command the time from the receipt of the carriage return terminating the command to the first character of the response is nominally less than 160ms Check Sum for Totals Report The response string to Totals Report Request T has a one byte check s
2. These auxiliary terminals are connected directly to the power input on Connector 4 Terminals 1 and 2 The auxiliary terminals are used to provide power to printers or Hand held computers Note that 0 Volts Auxiliary should not be used as a signal ground DC SUPPLY OUT A supply output voltage is provided to power sensors This output will provide a regulated voltage of 8 to 24 Volts and the voltage is adjustable by means of the potentiometer on the rear panel Maximum current is 50 and the instrument comes with the voltage factory set at 24 Volts When the instrument is powered from a DC power source the maximum output voltage on the supply output is the DC input voltage less 3 5 volts 56 9 3 9 4 9 5 WIRING The D type connectors are supplied with crimp type terminals suitable for wire sizes of 20 to 24 AWG Suitable crimp tools should be used for reliable connections and these are available from most connector manufacturers or suppliers to the following specification Crimp Tool HDP 20 Crimp D Extraction Tool 20 24 AWG D Crimp VEHICLE WIRING Trucks and other vehicles present a very difficult environment in which to mount electronics and high levels of electrical interference is common Therefore it is important to follow the same basic rules when installing the Trac 40 Supply Take the supply terminals back to the battery on separate wires Do not take the supply voltage from nearby circuits which may be used to
3. Remote STOP PRINT key Communications Type Printer Only Hand held Computer Only Printer and Hand held Computer Set Printer Type Standard Computer Printer Epson CTM290 Slip Printer Contrec Model 624 Printer Epson TM290 2 TM295 Slip Printer Contrec Model 632 2 Printer Computer Disables communications to printer computer 18 Step 12 12 13 14 15 16 Display Description If set to 99 the program will now to the END If Hand held is selected CONTRL Int Trac 40 will interrupt Hand held with Delivery Status Poll Hand held polls Trac 40 for Delivery Status The program will now go to the END Printer and Hand held No Column Select column width for Hand held controlled printer 32 column Sets print width for 32 columns 42 column Sets print width for 42 columns 80 column Sets print width for 80 columns If Ptype 00 02 03 or 04 are selected or Prn HH is selected in CO TYPE the following message is displayed CTS CTS Input En CTS Enabled Dis CTS Disabled If Printer Only or Printer and Hand held Protocol is selected the following message is displayed UNIT xx Units of measurement printed 00 None Ol Litres Ltrs 02 Gallons Gals 03 Barrels bbls 04 Pounds Ibs 05 Kilograms kg 06 Grams g 07 Tons ton Pr Str t Print Start time of the delivery on the printer ticket En Enable Start time Dis Disable Start time Pr GRS t Print Gross total of
4. DVxx x and D are only recognised as valid commands when temperature compensation is set for LPG or Petroleums 52 On receipt of T Delivery Report request the instrument sends the following ID No Del No Net Del Gross Del Finish Start Av Del Preset Truck ID Check Sum Total Total Accum Total Accum Temperature Value No Total The Preset value is only sent when the instrument is programmed for Preset mode and the gross totals and temperature are only sent when the temperature compensation is enabled On receipt of a A Auxiliary Report request the instrument sends the following XX XX XX KX XX XXK XX XX XXXXXX XX XX ID No Del End Date Del Start Time Del Finish Time Meter No Units of Check Sum Measure The Units of Measure are the same values as entered in calibration On receipt of a C Clock request the instrument sends the following XX HH MM SS X XX ID No Current Date Current Time Date Format Check Sum The response string to Totals Request T Auxiliary Report A and the Clock Request C have a one byte check sum attached to the end just prior to the terminating carriage return and line feed The Date Format dd mm yyyy EUR is indicated by 0 and mm dd yyyy USA is indicated by 1 All values are variable length and as displayed on the instrument itself The values are transmitted in ASCII with one or more spaces ASCII Code 0x20 between each field On rece
5. If temperature compensation is disabled the total is simply printed as the Delivery Total This is the average temperature during the last delivery This is only printed if temperature compensation is enabled This describes the base temperature to which the volume is corrected to and the density that has manually been entered for temperature compensation This information is only printed if temperature compensation is enabled This provides a dedicated line for the customer to sign on to verify the delivery received This only appears if selected in calibration 41 7 3 3 Connecting Multiple Trac 40 s to one Printer Connector 1 Junction Box Connector 1 1N4148 1N4148 gt lt Data Out Printer Data Out Printer Data In Printer Data In Printer 0 Volts Common 0 Volts Common Trac 40 RS232 Trac 40 RS232 TX Data RX Data Printer 0 Volts Common 42 7 4 7 4 1 HAND HELD COMPUTER ONLY It is common to use Hand held computers on board vehicles to record and transfer data back to an office computer The Trac 40 is able to transfer all delivery data to any computer with a serial port There are two modes of operation which are selectable during Calibration Interrupt Mode and Polling Mode Interrupt Mode In the Interrupt Mode the Trac 40 will initiate communications with the computer for recording the transaction at the end of a delivery Operation is as follows Note A full
6. and the delivery number will be incremented Relay 1 will close and flow should then start If flow does not start the unit will wait 3 minutes and record an End of Delivery If a ticket printer is installed and the total is greater than the Clearable Minimum Total then a ticket will be automatically printed Relay 2 in this mode is not used End of Delivery There a 3 ways to end a delivery 1 The PRINT STOP key is pressed at any time When the PRINT STOP key is pressed Relay 1 will immediately open If there is no flow and there has been a signal timeout an End of Delivery is recorded and a ticket is printed If there is flow the delivery will not be complete until the flow has stopped for a period longer than the timeout period Once this has occurred a ticket will be printed if a ticket printer is connected 2 Flow is interrupted for longer than 3 minutes If the flow is interrupted for a period longer than 3 minutes the delivery is complete and a ticket is printed if a ticket printer is connected 3 Pulser or temperature probe error If an error is detected Relay 1 will immediately open The display will alternate between the total and the word Err XX where XX is the error number If flow continues the instrument will continue to totalise as normal using one pulse or the last temperature The delivery is complete when any of the actions in paragraphs amp 2 above occur The instrument will record an End of Deliv
7. positive displacement meter to have two pulse units The Trac 40 can interface to flowmeters fitted with two sensors and connections to the flowmeters are outlined in Section 5 With quadrature input selected it is possible to have the instrument monitor the two pulse input channels for missing pulses and simultaneous pulses or phase errors Setting the FL INP parameter as described in section 4 1 step 6 to quad in setup allows the quadrature error checking to be selected by setting PULSCh to En step 7 in section 4 1 With pulse error checking enabled the user must enter the minimum volume over which the error checking is to be performed Vmin as well as the accuracy class the instrument will operate under A See section 4 1 PROGRAMMING THE SETUP PARAMETERS steps 8 and 9 With quadrature input selected and pulse checking enabled the instrument will generate an alarm if a quadrature flow or phase error simultaneous pulses on both pulse input channels has occurred since reset or last acknowledge quadrature error On detection of the alarm condition the alarm output will go low energise the output relays will de energise and the stop LED will be lit The instrument will continue to count any incoming pulses while the display will periodically flash the error message Err 13 for missing pulse errors or Err 18 for simultaneous pulse errors The quadrature error can be cleared by pressing the STOP key CALCULATION OF RATE AND TOTAL For
8. 5 should be ON DIP switches on the printer should only be changed while the printer power is OFF 40 7 3 2 Information Printed Each printout includes the following 1 10 11 12 Header Vehicle ID Unit ID Delivery Number Time Date Status Accumulated Totals Gross Delivery Total Net Delivery Total Product Temperature Volume Correction Density Information Customer Verification This is a factory programmed header on the ticket which can show the company or product name maximum 2 lines x 30 characters Identification number for the vehicle This is the ID number programmed during Calibration The delivery number is a sequential number which increments and is printed with every ticket It enables each ticket to be uniquely identified An internal clock enables the ticket to be printed with the time amp date The date can be programmed to print in European dd mm yyyy or US mm dd yyyy format The Start time of the delivery can also be printed if enabled in calibration This status code indicates what errors if any occurred during the delivery See Section 8 1 Error Codes for description The printout shows the Start and Finish Accumulated totals so that delivery verification can be made The Gross Delivery total is the uncompensated total and is only printed on the ticket if temperature compensation is enabled The Net Delivery Total is the compensated total for the delivery
9. CH2 a ee 7 8 a Logic Signal CMOS 5 6 12 13 off off off off on off off off b open 5 6 12 13 off off off off on off on off c Namur Proximity 5 set DC out to 8 volts N C 12 N C on off on on on on off off Channel 1 only d Switch or Reed Switch 200Hz max 5 6 off off off off on off on on Coil 20mV P P minimum 5 6 off on off off off off off off General Specification Switching Threshold 2 5 Volts except for input type and e Maximum Input Voltage 50V peak Input Impedance Input type a 100K on channel 1 10K on channel 2 Input typesb amp 10K Input type Input type 100K 5 1 3 Powering of Sensors The Trac 40 has a regulated DC output which can be used to power sensors A trimpot behind the rear panel of the instrument allows the voltage to be adjusted in the range of 8 Volts to the supply voltage less 3 5 Volts For example if the supply is 24Vdc then the maximum output is 20 5Vdc The output can supply a maximum of 50mA Note that when using this DC output to power opto sensors some flowmeter manufacturers require that a current limiting resistor be used Please refer to the flowmeter manufacturers data sheet if this is the case 22 5V Connector 2 10K S7 IN
10. If the data is successfully sent to the printer the unit will display PASS otherwise display FAIL if unsuccessful Pressing the Print STOP key will return the display to Prn CAL at which point another printout can be attempted or Test mode can be exited 20 5 INPUT amp OUTPUT CIRCUITS FLOW INPUTS 5 1 5 1 1 Frequency Inputs The Trac 40 has two pulse input circuits Channel 1 is used with both single and quadrature input signals The Channel can interface directly to Turbine Flowmeters Open Collector Outputs Reed Switches Logic Signals Namur Sensors Channel 2 is used only when a quadrature input is selected and becomes the 0 input while Channel 1 becomes the 90 input Channel 2 can interface directly to an Open Collector a Reed Switch a Logic Signal a Namur Sensor The frequency input circuits for the Trac 40 can be configured by the user to interface with most flowmeters A small 8 pole DIL switch on the input card is used to set up the input circuit to operate with different types of signals The input circuit is shown on the following page and examples of flowmeter interconnections are also given 21 5 1 2 Switch Settings The following are recommended switch settings for different input signal types Note input types d and e are only available on Channel 1 Channel 2 is limited to signal types a to c Input Signal Type Input Terminals Switch Settings CH1
11. Original Product name Vehicle ID Unit ID Delivery number Date of completion of delivery Start and finish time of the delivery Status of delivery Start and finish Accumulated totals Net and Gross totals Product Temperature average Volume correction information including density settings Customer verification line lt HHH HHH 0 SIGNAL TIMEOUT A programmable Signal Timeout is used to record when flow has stopped Usually the timeout period is programmed to be 10 20 times the period between pulses at the minimum flowrate The purpose of the timeout is to accurately detect when flow has stopped and therefore record any overrun For example at the end of a delivery when the relays open there may be some overrun due to residual liquid in the pipe Rather than not recording this residual amount the Signal Timeout enables the quantity to be recorded by continuing to totalise until the pulses have timed out Once a Signal Timeout is determined then an End of Delivery is recorded and a ticket is printed THE 3 MINUTE TIMER The purpose of the 3 minute timer is to prevent a partial delivery being made at one location and without resetting the register driving to a second location and delivering the balance of the load In this case the customer at the second location could be charged for both deliveries The 3 minute timer will prevent this by automatically terminating the load if there is n
12. T C or F Average temperature of product GROSS or NET Only if temperature compensation is programmed If the instrument is totalising on Gross Product this display will show the Net Total The opposite will occur if the instrument is totalising on Net Product CODE This display will show the current software version Changing Batch Quantity or Density The Batch Quantity and Density can both be changed via the front panel in the following way 1 Press the DISPLAY key The unit will display PRESET 2 The numeric value of the batch currently stored will appear When this numeric value is being displayed press the gt RESET key The unit is now in edit mode and the batch quantity can be changed 3 The most significant digit flashes indicating that it is selected Note that only flashing digits can be changed The key is used to increment the flashing digit 4 The gt key is used to change digit and cause the next digit to flash enabling it to be incremented 5 Once the desired quantity is entered press the DISPLAY key to exit from edit mode 6 The instrument displays the word SET when exiting from edit mode To change the Base Density the DISPLAY key should be pressed until the DENSITY appears Steps 2 to 5 above should then be followed 3 2 NON PRESET MODE 3 2 1 Starting a Delivery 3 2 2 3 2 3 To start a delivery the RESET key is pressed and held for 2 seconds After 2 seconds a reset will occur
13. can be entered Set to 0 if no limit on batch size Slow start time Time in minutes seconds when Relay 2 will energise once the batch has started Prestop Quantity Quantity at which Relay 2 will de energise before the end of the batch eg if the batch quantity is 100 litres and the Preset Quantity is 2 litres relay 2 will de energise after 98 litres The Signal Timeout in seconds Setting to 00 disables this feature 17 4 3 ENTERING RS232 PARAMETERS Step 1 10 11 Display RS232 TEST END CAL BATCH Description Enter Communications Parameter Check the Input Signals Exit to normal operation Program Setup Parameters Set Batch Parameters If the Real Time Clock option is installed the following will be displayed If not installed the program will now go to Step 5 DF Eur USA Date XXIXXIXX HOUR XXIXX BAUD XXX DATA 7 8 PARITY OP EP ID NO 0 1 99 REAR S Start Pr Stop CO TYPE Printr Hand H Prn HH If Printer is selected P TYPE xx 00 01 02 03 04 99 Date Format European ie days months years USA ie months days years Enter date as Years Months Days Enter time as a 24 hour clock Hours Minutes Baudrate 300 600 1200 2400 4800 and 9600 Word length 7 bits 8 bits Parity Odd Parity Even Parity Unit Identification Number None Id number Select Remote Key Function Connector 3 Terminal 14 Remote Start
14. expires then the error message HH Err is displayed Again this can be acknowledged by pressing the STOP key or cleared by receiving a request for the Delivery Report Similarly if a delivery is attempted using the RESET key and the Trac 40 has already sent the Delivery Report but the transaction is not complete ie no TC command then the error message HH busy is displayed Again this can be acknowledged with the STOP key or automatically cleared by receiving a TC Transaction Complete command via the serial communications The Trac 40 s Delivery Status Code always indicates any pending errors and should be used to aid the Hand held by directing it as to what action is required At any time the Trac 40 can be interrogated by the Hand held to monitor rate temperature totals or status 44 7 4 3 Multiple 40 Units to a Single Hand held Connector 3 Junction Box Connector 3 1N4148 1N4148 Data Out Computer Data Out Computer Data In Computer Data In Computer 0 Volts Common 0 Volts Common Trac 40 RS232 Trac 40 RS232 TX Data Hand Held RX Data Computer 0 Volts Common 45 7 5 PRINTER AND HAND HELD COMPUTER In this mode there is both a printer and a Hand held connected to the Trac 40 The Trac 40 has overriding control and responsibility to ensure that the transaction is recorded correctly for each delivery but the Hand held is given the opportunity include
15. instruments without temperature compensation the volumetric flowrate at flow conditions R is calculated as follows _fxH ae where f is the input frequency in Hz 15 timebase of rate and is 60 for minutes and 3600 for hours Sis the Scaling Factor The Scaling Factor S is equal to the K factor of the flowmeter expressed in pulses per unit volume The flowrate R as expressed in the above equation is the volumetric flowrate at flow conditions With temperature compensation the flowrate R is corrected to give the flowrate at a base temperature 31 6 3 NON LINEARITY CORRECTION Non linearity correction enables the instrument to correct for known non linearities in the flowmeter This feature is not selectable for analog flow inputs Up to 10 frequencies and scaling factors can be programmed Data on the flowmeter non linearity can usually be supplied by the flowmeter manufacturer in the form of a Calibration Certificate and is the result of individual tests on a flowmeter over a range of flowrates The Certificate will list a number of flowrates or frequencies with the measured K factor eg pulses per gallon or litre at each flowrate The following diagram graphs the change in scaling factor with frequency for a hypothetical flowmeter The heavy black line represents the actual scaling factor of the flowmeter while the light black line is the approximation used in the instrument Scaling Factor FACT 6 FR
16. the delivery on the printer ticket En Enable Gross Total Dis Disable Gross Total Pr SIGN Print optional Customer Sign to Verify Delivery line at base of ticket En Enable Customer Verification line Dis Disable Customer Verification line 19 4 4 CHECKING THE INPUT SIGNAL Step 1 Display Description TEST Check the Input Signals RS232 Enter Communications Parameters CAL Program Setup Parameters BATCH Set Batch Parameters END Exit to normal operation The following steps are displayed if TEST is selected Sr X XXX Software revision number If the instrument has Temperature Compensation the following will be displayed RTD Displayed for 1 second to indicate the RTD XXX XX The measured temperature is then displayed Use the DISPLAY switch to step to the Flow Input If the Flow Input is a Single frequency input the display will show Freq Displayed for 1 second followed by the actual frequency XXXX X Frequency in Hz If the Flow Input is a Quadrature frequency input the display will show qfreq Displayed for 1 second followed by the actual frequency XXXX X Frequency in Hz If the flow is reversing a negative sign will appear If the Real Time Clock option is installed the display will then show CLOC Clock Time in Hours Mins Sec dAtE Date Date in Day Month Year Prn CAL Opportunity to print the setup program for the instrument Press the TEST key to start a calibration printout
17. uncompensated or on the Net Total which is compensated for temperature Both totals are reset at the beginning of each delivery Hold RESET key for 2 seconds Relays activated PRINT STOP Pressed Flow Interrupted 3 minutes elapsed PRINT STOP P 4 Flow Restarts ressed Batch Qty Reached Relays Deactivated Relays Deactivated Relays Deactivated Timeout Elapsed Timeout Elapsed End of Delivery PRINT Flow Chart 2 Operation of Trac 40 in PRESET Mode 10 3 4 3 5 3 6 PRINTING A TICKET If a printer is enabled at the end of every delivery the Trac 40 unit will automatically print a ticket Note the instrument cannot be reset or another delivery started until a ticket is printed The first ticket after the delivery is complete is the original Pressing the PRINT STOP key after an original has already been printed will print a duplicate ticket and all duplicate tickets will contain the word DUPLICATE The user can print as many duplicate tickets as required by pressing the PRINT STOP key Once a new delivery has started a duplicate ticket cannot be printed Each time a ticket is printed the message Printing is displayed while the unit is busy sending serial data to the printer A ticket can have the following Header company name and location Duplicate or
18. used to control a pump A time delay between the Start and the time when relay 2 energises can be programmed to provide a soft startup The delay can range from 0 no delay to 79 minutes and 59 seconds A Prestop quantity ie the quantity to the end of the batch can also be programmed to provide a slowdown of flow at the end of the batch thereby enabling precise quantities to be batched The relays are voltage free contacts with the following power ratings 30 Vdc or Vac maximum 3 Amps maximum switching current In Non Preset Mode only relay 1 is used and there is no delay start or prestop in this mode An example of Relay operation when both slow Start up and Prestop features are used is shown below Preset Quantity Reset Reached Stop Reset 1 1 Count Up i Relay 1 1 T 1 i i i i Relay 21 i i i lt Start Time Prestop __ lt i i Quantity i i i Endof Timeout period I Delivery End of Delivery 27 5 6 THE OUTPUT PULSE An OUTPUT PULSE is available on Connector 1 Terminal 6 for driving remote counters and produces a pulse each time the Accumulated Total increments by one digit For example if the Accumulated Total has a resolution of 0 01 litres a pulse is produced each 0 01 litres The pulse is a current sinking pulse of approximately 10mSec produced by an open collector transistor The maximum pulse rate is limited to 49 pulses per second and the resolution o
19. will respond with the totals information each time the request is made except when the completed delivery was less than the Clearable Minimum total and the unit will then return a delivery status code of S14 Request Auxiliary Report totals The unit will respond with the extra information that is found on the printed docket that is not included in the Delivery Report T This command includes the Delivery End Date Delivery Start Time Delivery Finish Time Meter No and Units of Measurement Request flowrate and temperature Request Current Clock Time and Date The unit will respond with the current Date Time and Date Format Request batch preset Request density setting 50 DS Request Status of the Trac 40 The unit will return an ASCII value to indicate the status of the instrument as follows For Hand held Computer Mode of Operation ie no printer connected XX SXX ID Status The upper case S preceding the actual status number indicates the character after the ID number is a status number This eliminates any possible confusion between response types Status 00 Delivery is complete total report has been sent and has received a TC Transaction Complete message from a Hand held Ready to start new delivery 01 Delivery is complete total report has been sent but is still waiting to receive a TC message the Hand held 02 Batch is in Slow Start Cycle 03 Batch is in Prestop Cycle 04 Batch is in Full
20. Display 6 digit LCD 0 7 17 8mm high digits Display Update Rate 0 25 second Transducer Supply 8 24Vdc 50mA maximum Power Requirements 11 5 to 28 5 volts DC 130mA typical current PHYSICAL Displays Batch Total 6 digit 11 8mm high backlit LCD Keypad Buttons Switches Four heavy duty switches Weights amp Measures Seal A program access switch located behind a screw on the rear The switch can be affixed with a lead seal to prevent tampering Enclosure Standard Dimensions 5 7 144mm wide x 2 8 72mm high x 7 5 190mm deep Material Anodised Aluminium Sealing IP65 Nema 4X weatherproof or IP67 option Weight 2 0 kg approx Connectors The standard connector backshells extend the depth to 9 3 235mm Enclosure Explosionproof Dimensions 11 2 285mm wide x 11 3 287mm high x 9 1 231mm deep Approvals Cenelec and CSA NRTL C applied for OPERATIONAL Power Requirements 11 5 Vdc to 28 5 Vdc Operating Temperature 10 to 50 C Communications Computer Printer RS232 Interference CE compliant INPUTS AND OUTPUTS Flow Inputs Input Frequency Minimum 0 25Hz on Rate on Total Maximum 10 kHz for a single input 2 5 kHz for a dual input Dual pulse is for pulse verification only and does not detect reverse flow Pulse Integrity Dual pulse only If a pulse failure is detected the system will alarm and stop flow on that channel Note This is in accordance with API Sta
21. EQ FREQ FREQ FREQ FREQ FREQ 4 Frequency 6 5 4 3 2 1 Khz Linear Interpolation is used between points on the curve except for Factor 1 which maintains a constant value between Frequency and the maximum input frequency During Calibration the program requires the user to input a frequency and the Scaling Factor K factor of the flowmeter at up to 10 points on the curve Generally these points will correspond to those shown on the Certificate If any frequency is set to OHz Frequency 6 in the preceding example then the program will require no further correction points to be programmed Hence the user can program any number of correction points up to a maximum of 10 Note that if all 10 correction points are required then Frequency 10 will automatically be assigned the value of 0Hz Also note that the last frequency point programmed ie the frequency point set to OHz must also have a scaling factor applied to that point 32 6 4 FILTERING Frequency fluctuations caused by pulsating flow through a flowmeter often makes the Rate impossible to read with any precision The Trac 40 has a digital filter which will average out these fluctuations and enable the Rate to be read to four digit accuracy The ability to select a suitable filtering level means that highly accurate and stable readings can be obtained without excessive lag The diagram below shows a pulsating signal input together with the effect of filtering Rate Filtered Respon
22. ESET Preset Mode can be selected to give the unit batching features En Enable Preset Mode Dis Disable Non Preset Mode 5 RESTOT Reset all totals to zero To reset all totals net gross accumulated and Delivery Number press the RESET key once 6 FL INP Select either a single frequency input or a dual input ie two pulses from a single flowmeter single Single input quad Dual input 7 CORRCT Select either a linear input or non linear correction for the flowmeter Linear input Nonlin Linear Correction or Non Linear Correction 8 SCALE If Linear Correction is selected the scaling factor is programmed as follows Fact Enter the Scaling factor K factor of the flowmeter The program then steps to step 12 If Non Linearity Correction is to be programmed up to 10 frequencies and scaling factors can be entered Freq 1 Freq 1 is programmed to the first frequency point in the range of 0 to 9999Hz Fact 1 This is the K factor of the flowmeter i e pulses per gal etc at Freq 1 The digits before the decimal point whole numbers are programmed first followed by the decimals The scaling factor can be programmed in the range of 0 1000 to 50 000 Freq 2 Freq 2 is programmed to the second frequency point Fact 2 Scaling Factor 2 to Fact 10 Scaling Factor 10 Note that Freq 10 is not displayed since it must always be zero 14 Step 10 11 12 13 14 15 16 17 18 Display Description FCUT Freque
23. Flow Cycle ie both relays energised 05 Preset value is reached or a Stop Delivery has been detected but End of Batch has not yet been reached 06 Auto Flow has been detected 07 Flow Alarm detected due to a temperature or dual pulse error midway through a delivery 08 Delivery is complete and is waiting to receive a request for total report T 09 Not applicable for Hand held only modes 10 Delivery is complete but the total report has not been down loaded due to communications error or the Hand held being busy 11 Not applicable for Hand held only modes 12 Unit is busy in calibration Batch set or Density set modes 13 Delivery display test in progress 14 The last delivery total was less than the Clearable Minimum Total and there is no Totals Report to be collected This status is only given in response to a request for a Totals Report T 51 For Printer and Hand held Computer Mode of Operation Status 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 XX SXX ID Status Delivery is complete and has printed original ticket and has received a TC Transaction Complete message from the Hand held Ready to start new delivery Delivery is complete and has printed original ticket but is still waiting to receive a TC message the Hand held Batch is in Slow Start Cycle Batch is in Prestop Cycle Batch is in Full Flow Cycle ie both relays energised Preset value is reached
24. N The Trac 40 uses a low power CMOS microprocessor to perform all control functions and calculations The instrument is fully programmable with all operating parameters and calculation constants user programmable All parameters and constants are stored in a non volatile memory which retains data without battery backup for a minimum of 10 years The internal clock is battery backed A block diagram of the inputs and outputs is shown below Pulse Input JUL RS232 Output for Channel 1 Handheld Communication RS232 Output for Printer Signal Common EOB Control Relay Outputs 2 Pulse RTD Output PT100 Flow Alarm DC Input Power 12 28V DC Power Ground DC Power Output to Sensors 3 1 3 1 1 3 1 3 FRONT PANEL OPERATION Modes of Operation The Trac 40 can be programmed during setup to operate in one of 2 modes 1 Preset Mode where the required quantity is entered prior to delivery This mode will provide batching functions 2 Non Preset or Start Stop Mode where the instrument operates as a totaliser only stopping and starting must be performed via the operator keypad Displayed Information The following information will be displayed when the DISPLAY key is pressed PRESET The preset Batch Quantity This is displayed only if the instrument is in Preset mode DENS The Base Density at 15 C or 60 F Only displayed if temperature compensation is programmed RATE Rate of flow ACC Net Accumulated Total
25. OPERATING MANUAL FOR MODEL Trac 40 ELECTRONIC TRUCK REGISTER Contrec Manufacturing Limited Riverside Canal Road Sowerby Bridge West Yorkshire HX6 2AY United Kingdom Email sales contrec co uk Website www contrec co uk contrec REVISIONS Issue Number Date Approved PRELIMINARY 01 06 1999 1 0 03 03 2000 2 0 24 03 2000 3 0 09 10 2000 4 0 02 07 2002 5 0 08 02 2006 6 0 20 03 2014 CONTENTS 1 Overview 1 1 Part Number Designations Specification Operation 3 1 Front Panel Operation 3 1 1 Modes of Operation 3 1 2 Displayed Information 3 1 3 Changing Batch Quantity or Density 3 2 Non Preset Mode 3 2 1 Starting a Delivery 3 2 2 End of Delivery 3 2 3 Auto Reset Flow Chart 1 Operation of Trac 40 in Non Preset Mode 3 3 Preset Mode 3 3 1 Starting a Batch 3 3 2 End of Batch 3 3 3 End of Batch Signal 3 3 4 Batching on Gross or Net Total Flow Chart 2 Operation of Trac 40 in Preset Mode 3 4 Printing a Ticket 3 5 Signal Timeout 3 6 The 3 Minute Timer 3 7 Frequency Cutoff 3 8 Clearable Minimum Total 3 9 Overflow Theft Detection 3 10 Loss of Power Calibration 4 1 Programming the Setup Parameters 4 2 Entering the Batch Parameters 4 3 Entering RS232 Parameters 4 4 Checking the Input Signal Input Circuits 5 1 Flow Inputs 5 1 1 Frequency Inputs 5 1 2 Switch Settings 5 1 3 Powering of Sensors 5 2 Temperature Input 26 5 3 Remote Run and Stop
26. PLC or Electronic Counter 29 5 8 POWER SUPPLY AND GROUNDING The following diagram shows the relationship between the supply and ground terminals Connector 4 1 12 to 28 Volts d c Vin Supply Vout auxiliary Connector 1 Terminal 9 Connector 3 Terminal 9 0 Volts auxiliary Connector 1 Terminal 5 Connector 3 Terminal 10 0 Volts Supply Interference Protection Coils Connector 2 V Out Regulated Power Supply 0 Volts Common Chassis Ground Connector 1 Terminal 4 Connector 2 Terminals 3 amp 15 Case of Connector 3 Terminals 5 amp 11 Instrument Connector 4 Terminals 3 amp 6 Electrical Ground Power Supply and Grounding The auxiliary power outputs are provided as a means of routing power to a printer or Hand held computer RF interference protection coils are placed in the line between 0 Volts Common and 0 Volts auxiliary and therefore shorting these terminals would degrade the noise immunity of the instrument A Chassis Ground is provided at various terminals for shielding of signal wires 30 6 6 1 6 2 TECHNICAL DESCRIPTION SINGLE AND QUADRATURE INPUTS In most industrial flowmetering applications a frequency producing flowmeter has only a single output However in many custody transfer applications it is a requirement that the flowmeter has two outputs so that the integrity of the signal can be assured This usually requires a turbine meter to have two coils or a
27. PUT COMPARATOR 1K 100K Signal 5 53 58 Flow 1 100R 01 1uF Signal 33K 5V F 10K INPUT COMPARATOR Signal C 12 51 Flow 2 100 100R 01 13 Signal L ah The Frequency Input Circuits 33K 23 1 Squarewave CMOS or Pulse Connector 2 eg vortex preamplifiers or magnetic flowmeters 2 Open Collector on Ch 1 1 8 Connector 2 eg preamplifiers and opto sensors 3 Reed Switch 6 12 Connector 2 eg positive displacement flowmeters with reed switch outputs Ch2 Common 2 Reed Switches 24 4 Coils Connector 2 Use shielded cable 5 Namur Proximity Switch Connector 2 6 Opto Sensors Resistor Connector 2 25 eg millivolt signal from a turbine flowmeter single input only eg positive displacement flowmeters with 2 wire proximity switch outputs eg preamplifiers and opto sensors Note that the current limiting resistor may be required See the flowmeter manufacturer s data 5 2 5 3 TEMPERATURE INPUT Four wire RTD measurement is the most accurate form of measurement and can be used for measurements with the RTD up to 100 meters from the instrument It is mandatory to use shielded cable when interfacing to RTD s Two or three wire RTD s can be used in place of 4 wire RTD s but 4 wires must be taken to the RTD and the signal and current wires joined as cl
28. RS232 Data In Computer 2 RS232 Data In Printer 10 0 Volts auxiliary 6 Pulse Out 3 RS232 Data Out Computer 0 Volts Common 11 Chassis Ground 4 Computer RTS 12 Not used Connector 2 15 way female 5 Chassis Ground Pins 13 Not used 8 V out Not used 15 Chassis Ground 14 Remote Key Start or Print Stop 7 0 Volts Common 7 End of Delivery 14 Not used 15 0 Volts Common 6 Flow 1 Signal 8 Flow Alarm Output 13 Flow 2 Signal 5 Flow 1 Signal Connector 4 9 way male 12 Flow 2 Signal Pins 4 Calibration Switch EX410 only 1 Vin Supply 11 0 Volts Common 6 hassis GND Chassis Ground 2 0 Volts Supply 10 PT 100 I 7 Not used 2 PT100 Signal 3 Chassis Ground 9 PT 100 Signal 8 Relay 2 Normally Open 1 PT100I 4 Relay 1 Normally Open 9 Relay 2 Common 5 Relay 1 Common Connector 4 Power Input amp Relay Ouputs Connector 3 Computer Comms amp auxillary I O Connector 1 Connector 2 Printer Inputs for Flow amp Pulse Out amp Temperature Calibrate Vout Switch Set Remove Screws to access switch and trimpot View Looking at the Rear of the Instrument 58
29. Switches 5 4 External Calibration Switch for Ex 410 enclosures only 5 5 Control Relay Outputs 5 6 The Output Pulse 5 7 End of Delivery and Flow Alarm 5 8 Power Supply and Grounding N m 2 6 Technical Description Single and Quadrature Inputs Calculation of Rate and Total Non Linearity Correction Filtering Temperature Compensation 6 5 1 Temperature Input 6 5 2 Volume Correction for General Liquids 6 5 3 Compensation for Petroleum Liquids 6 5 4 Compensation for Liquefied Petroleum Gas LPG 6 5 5 Compensation for Anhydrous Ammonia 7 Trac 40 Communications 7 1 7 2 7 3 7 4 7 5 7 6 7 7 Modes of Operation Hardware Connections Printer Communications 7 3 1 Printer Types 7 3 1 1 Connection and Settings for Trac 40 to Epson Slip Printer TM 295 7 3 2 Information Printed 7 3 3 Connecting Multiple Trac 40 s to One Printer Hand held Computer Only 74 1 Interrupt Mode 7 4 2 Polling Mode 7 4 3 Multiple Trac 40 Units to a Single Hand held Printer and Hand held Computer Software Protocol 7 6 1 Framed ASCII Protocol 7 6 2 Echoing Commands 7 6 3 Response Times 7 6 4 Check Sum for Totals Report Commands and Responses 8 Error Codes 8 1 8 2 Displayed Error Codes Printed Error Codes 9 Wiring Connections Power Supply and Ground Terminals DC Supply Out Wiring Vehicle Wiring Enclosure Trac 40 Connections 1 OVERVIEW The Trac 40 is an electronic truck r
30. additional information including special headers customer information and pricing etc The Trac 40 s part of the print out is largely unformatted with the exception of knowing the width of the printer used and positioning the text accordingly Other formatting such as double height and double width text or paper feed is to be carried out by the Hand held Since the Trac 40 has two virtual serial communications ports one to the printer and the other to the Hand held and the Trac 40 supplies the connection between the two there are some special control commands that allows the communication control logic to switch the gates on the direction of the communications gates These commands are Esc Esc to connect the Hand held to the Trac 40 1b 1b 59 Hex Esc Ese Z to connect the Hand held to the printer 1b 1b 5A Hex Operation is as follows 1 At the End of Delivery EOD the Trac 40 ensures that the communication gates are set to Trac 40 to Hand held waits for any incomplete commands to be serviced and then sends the Delivery Status ID number and Status Code ID S08 to the Hand held This is to give the Hand held some indication that the Trac 40 is about to switch to Trac 40 to printer communications and print its part of the delivery docket 2 The Trac 40 switches the communications direction to Trac 40 to printer and then prints the totals and temperature etc on the ticket if paper is present 3 The Trac 40 returns the communicat
31. ally a hand held device mounted in the cab of the vehicle This mode of communications is referred to as Hand held throughout this manual 3 Printer and Hand held The mode of operation is programmed during Calibration HARDWARE CONNECTIONS In Printer only mode only Connector 1 is used and is connected to one of the supported printers The 5232 serial port on Connector 3 is not used in Printer only mode In Computer only mode only Connector 3 is used and is connected to a computer or Hand held that supports the protocol outlined in the Communications section of this manual The RS232 serial port on Connector 1 is not used in this mode In the Printer and Hand held mode the printer is connected to Connector and the Hand held is connected to Connector 3 The Trac 40 then has the ability to control the direction of communication by switching gates in the direction control logic This allows the Trac 40 to communicate with either the printer or the Hand held Also with some special control commands from the Hand held the Trac 40 can connect the Hand held directly to the printer 1 Trac 40 1 Connector 1 RS232 Data In Printer lt a RS232 Data Out Printer i ee page pe ae 1 i 7 Printer 1 1 1 Processor RX Line Communications 1 Processor TX Line eee Buffers 1 1 1 1 i Connector 3 1 i RS232 Data In Computer lt RS232 Data Out C
32. any incoming flow On receipt of the TC command the Trac 40 will reply with the Delivery Status ID S00 7 The Hand held can using the DC Delivery Commence command start a new delivery if the Trac 40 has already received a TC command If the unit has not received a TC command it will not start a new delivery or be able to monitor any incoming flow and will respond to the DC command with a Delivery Status indication that the transaction is not complete 8 Ifa delivery is attempted with a manual press of the RESET key and the Delivery Report has not yet been downloaded then the error message d LOAd is displayed The Delivery Status is sent every 3 seconds This error can be automatically cleared by receiving a T request Otherwise it can be acknowledged with the STOP key and a download is initiated by again attempting to send the Delivery Status to interrupt the Hand held Again if in 3 seconds there is no request for the Delivery Report the HH Err is displayed and the unit continues attempting to communicate every 3 seconds until a TC or DH command is acknowledged via communications or the STOP key is pressed 9 Similarly if a delivery is attempted using the RESET and the Trac 40 has already sent the Delivery Report but the transaction is not complete ie TC command then the error message HH busy is displayed The Delivery Status is again sent every 3 seconds to indicate the Trac 40 s requirement This error can be automaticall
33. bration or Xon Xoff software handshaking be used Xon Xoff is automatically selected when CTS is disabled The settings of both the Trac 40 and the printer must match one another Some printers do not have the selection of CTS hardwire handshaking 1 Standard Computer Printer The printer must have a serial interface installed to be able to communicate with the instrument Communication via a parallel port on the printer is not possible 2 Epson CTM290 and TM290 2 TM295 Slip Printers The Data In line from the printer must be connected for the interface to work properly The instrument interrogates the CTM290 and TM290 2 TM295 to ensure that there is paper in the printer before printing a ticket 39 7 3 1 1 Connection and Settings for Trac 40 to Epson Slip Printer TM 295 Trac 40 RS232 Epson Slip Printer TM 295 9 way male 25 way male D sub connector D sub connector Signal Ground PRN RX Data In PRN TX Data Out CTS Signal Ground TXD Transmit Data RXD Receive Data CTS DSR DCD DTR Chassis Ground Connector 1 Serial RS323 Port Trac 40 factory default communication settings are 9600 baudrate 8 data bits ODD parity CTS disabled To match the printer communication settings to the Trac 40 factory default the DIP switches on SW1 on the bottom of the printer should be DIP switches 3 5 ON only If hardwire handshaking is to be used CTS should be enabled in calibration and only printer DIP switch
34. c 40 returns the communications direction back to Trac 40 to Hand held and sends the Delivery Status ID 510 to indicate that the original has not been printed and will require operator intervention 46 10 11 The printout can be re started by either pressing the STOP key or via the serial communications with a PR Print Request from the Hand held The PR command will cause the Trac 40 to attempt an original or duplicate printout depending on whether an original has already been completed or not If the TEST key is pressed on the Trac 40 it does not test for paper status from the printer as it would if the unit were in Printer Only mode After the Trac 40 sends the Delivery Status of ID S08 printing original ticket or ID S09 printing duplicate ticket indicating the Trac 40 now offline the Hand held must not attempt to communicate with the Trac 40 until it comes back online with another Delivery Status to the Hand held A possible timer could be used in the Hand held to trigger an alarm if the Trac 40 is offline for an excessive amount of time due to a possible printer error 47 7 6 7 6 1 7 6 2 7 6 3 7 6 4 SOFTWARE PROTOCOL The protocol supported on the serial interface board is a framed ASCII Protocol where all messages are started with a colon and terminated by a carriage return ASCII Protocol is commonly used since it is easy to interface to using string commands which are supported by C and Basic
35. description of all Commands and Status Codes used is given in Section 7 8 of this manual 1 At the End of Delivery EOD the Trac 40 initiates the transaction recording by sending a Delivery Status comprising of the ID number and Status Code to the Hand held After the Delivery Status is sent the Trac 40 waits up to 3 seconds for the Hand held to reply with the T command Request for Delivery Report 2 Ifthe 3 second timer expires before a reply is received the Trac 40 displays the error message HH Err to indicate there has been no return communications 3 While the HH Err is being displayed the serial communication is monitored and the Delivery Status is sent every 3 seconds The error continues to be displayed until either a T request is received which will automatically clear the error or the STOP key is pressed 4 When the Hand held replies with a T command the Trac 40 then responds with the Delivery Report string with a checksum attached 5 If the Hand held detects that the checksum is incorrect then the Hand held should re request the Delivery Report If there are no errors the Hand held is then free to download any parameters preset size or density required for the next scheduled delivery 6 At the earliest opportunity the Hand held should send a TC command Transaction Complete to the Trac 40 to indicate that it has completed any essential interrogation required and allow the Trac 40 to start a new delivery and totalise
36. e If more than one type of error occurred during the delivery the error codes are combined ie Temperature error 012 Pulse error 013 Overflow error 200 gives a status code of 225 55 9 9 1 9 2 WIRING CONNECTIONS POWER SUPPLY AND GROUND TERMINALS The power supply and grounding circuit is detailed in Section 5 5 Definitions are Chassis Ground These terminals are for shielding purposes and the Chassis Ground is connected to the aluminium case of the instrument A terminal on the side of the case enables a solid connection between the case of the instrument and the vehicle Note that the Chassis Ground is NOT 0 Volts or Signal Common and should only be used for shielding purposes It is recommended that the flowmeter inputs temperature inputs communication links and remote switch input all use shielded cable with the shields connected at the Trac 40 only In order to comply with the requirements for Electromagnetic Compatibility as per EMC Directive 89 336 EEC of the Council of European Community shielding on all signal cable at the instrument only is mandatory practice 0 Volts Common This signal is the Signal Common for the communications lines Pulse Output End of Batch and Flow Alarm Outputs and the dc Voltage Output Vout Connector 2 Terminal 8 is the regulated dc output which can be used to power the flowmeters The negative of this supply is 0 Volts Common Vout Auxiliary and 0 Volts Auxiliary
37. egister designed for custody transfer applications Preset or Start Stop Mode The Trac can be programmed to operate as either a Preset system where the required quantity is entered prior to a delivery or as a Start Stop system where an unspecified quantity can be delivered Both modes have relay outputs which can be used to control pumps and tank valves Custody Transfer Approval The Trac includes dual pulse integrity check of the input signal and temperature compensation to API Tables as required for custody transfer Temperature compensation is selectable to include compensation for general petroleums LPG or other products If temperature compensation is not required it can also be disabled Truck Interlocks Because the Trac is designed for truck applications special features unique to truck applications are incorporated into the system including Low frequency input cutoff which will ignore spurious flowmeter pulses which may be caused by pipe vibration as the vehicle travels between deliveries Delivery timeout which is incorporated into the software to prevent a partial delivery at one location and then a continued delivery at a second location without resetting the register termed riding the ticket A programmable Clearable Minimum Total that allows small totals from meter skip during pressurising of the system to be safely disregarded Delivery totals continue to be displayed even if power is disconnected A printe
38. ensity SG is programmed or dn 15 C If Metric units are selected the Density in kg m is programmed Only values within the appropriate density range will be accepted The program will now go to Step 20 Anhydrous Ammonia 19 The density is automatically set to 0 618 SG if US units are selected or 617 5kg m if SI units are selected The program will now go to Step 22 If Petroleums or Liquid Petroleum Gas is selected 21 dn Frt Enable access to change density value via the front keyboard En Enable access via front keyboard Dis Disable access via front keyboard 22 3 tout The 3 Minute Reset Timer En Enables the 3 minute timer for truck applications Dis Disables timer if not required 23 clr tot The Clearable Minimum Total 00 The delivery value below which there is no ticket or transaction required to This caters for meter skip and is entered as whole units 99 Setting to 00 disables this feature 16 4 2 ENTERING THE BATCH PARAMETERS Step 1 Display BATCH RS232 TEST END CAL Description Enter Batch Parameters if Preset enabled in CAL Enter Communications and Real Time Clock Parameters Check Input Signals Exit to normal operation Program Setup Parameters The following steps are displayed if BATCH is selected TOTAL Net Gross BATCH L XXXXXX START T XXIXX PREST XXXX T OUT 00 to 99 Batch on Gross total or on Net Total Net Gross Maximum Batch Size which
39. ery and a ticket will be printed if a ticket printer is connected Auto Reset An Auto Reset will occur if flow is detected after an End of Delivery has been recorded In this case the instrument will reset the total and increment the delivery number Relay 1 will not close after an Auto Reset When an Auto Reset has occurred the reset LED will remain lit Hold RESET key for 2 seconds Relays activated Totalising Flow Interrupted 3 minutes elapsed PRINT STOP 4 Flow Restarts ressed PRINT STOP Pressed Relays Deactivated Relays Deactivated Relays Deactivated Timeout Elapsed Timeout Elapsed End of Delivery PRINT Flow Chart 1 Operation of Trac 40 in NON PRESET Mode 3 3 3 3 1 3 3 2 3 3 3 3 3 4 PRESET MODE When in Preset mode the Trac 40 is designed to operate as a batch controller The quantity to be delivered must be entered via the front keypad or via serial communications Once the batch quantity is delivered the relays will open and the batch ended Starting a Batch To start a batch the RESET key is pressed and held for 2 seconds After 2 seconds a reset will occur and the delivery number will be incremented Relay 1 will close and flow should then start If flow does not start the unit will wait 3 minutes and record an End of Delivery A tick
40. et will be automatically printed if a printer is installed and the total is greater than the Clearable Minimum Total End of Batch An End of Batch occurs with any of the following 1 Batch is complete Once the flow total reaches the programmed batch quantity and has stopped for a period longer than the timeout period the delivery is complete An End of Delivery is recorded and a ticket is printed if a ticket printer is connected 2 The PRINT STOP key is pressed at any time When the PRINT STOP key is pressed Relays 1 and 2 will immediately open If there is no flow and there has been a signal timeout an End of Delivery is recorded and a ticket is printed If there is flow the delivery will not be complete until the flow has stopped for a period longer than the timeout period Once this has occurred a ticket will be printed if a ticket printer is connected 3 Flow is interrupted for longer than 3 minutes If the flow is interrupted for a period longer than 3 minutes the delivery is complete and a ticket is printed if a ticket printer is connected End of Delivery Signal An End of Delivery signal from an open collector transistor is output on Connector 3 Terminal 7 When reaching the End of Delivery the output transistor is switched on and will remain in the on state until the instrument is reset Batching on Gross or Net Total When operating in Preset mode the Trac 40 can be programmed to batch on either the Gross Total which is
41. fied Petroleum Gas LPG The LPG correction program uses the American Petroleum Institute tables to volume correct the LPG to a reference temperature of 60 F for US units and 15 C for Metric units The program uses an internally stored table to correct to the following standards US units API Table 34 for correction of volume to 60 F against relative density 60 60 F for liquefied petroleum gases Metric units API Table 54 for Reduction of Volume to 15 C against density at 15 C for liquefied petroleum gases For US units the density is programmed as the Relative Density SG and the volume is referenced to 60 F For Metric units the density is entered as kg litre and the volume is referenced to 15 C When programming the density the values must be within the following limits otherwise an error message will be displayed US units 0 501 to 0 600 Metric units 0 500 to 0 600 kg litre The temperature compensation is performed over a temperature range of 45 C to 60 C 49 F to 140 F Compensation for Anhydrous Ammonia The temperature compensation for Anhydrous Ammonia is over a temperature range of 0 40 32 F 104 F When Anhydrous Ammonia is selected the density is automatically fixed at 0 618 SG or 617 4kg m 37 7 7 1 7 2 TRAC 40 COMMUNICATIONS MODES OF OPERATION There are three modes of operation 1 Printer only using a variety of ticket printers 2 Computer only where the computer is gener
42. ions direction to Trac 40 to Hand held once the original ticket is printed and sends a Delivery Status ID S01 to the Hand held to indicate the original has been printed 4 The Hand held is then free using the communications control to connect the Hand held to the printer to continue printing on the ticket The Hand held can also interrogate the Trac 40 to obtain the Delivery Report Delivery Status temperature and density etc 5 The Hand held is free to download any parameters preset size or density required for the next scheduled delivery The Hand held is also able to prepare and print the header information for the next ticket 6 At the earliest opportunity the Hand held should send a TC command Transaction Complete to the Trac 40 to indicate that it has completed any essential interrogation required and allow the Trac 40 to start a new delivery and totalise any incoming flow On receipt of the TC command the Trac 40 will reply with the Delivery Status ID S00 7 If the Trac 40 is configured for a 42 column slip printer then the Trac 40 checks for paper at the beginning of each printout If the Trac 40 detects there is no paper then it will display the PAPER error whilst continually polling the printer for its paper status It will continue to display the error until either paper is detected or the STOP key is pressed If paper is automatically detected then the printout continues However if the STOP key was pressed then the Tra
43. ipt of a R request the instrument sends the following XX XX X XXX CRLF ID Rate Temperature The temperature is only sent when the temperature compensation is enabled On receipt of a B request the instrument sends the following XX XX X CRLF ID Preset Value On receipt of a D request the instrument sends the following XX XX X CRLF ID Density Value 53 8 8 1 ERROR CODES The instrument has extensive self test facilities and will display an error code if it detects an invalid condition If the instrument displays an error code other than those listed below please contact the factory DISPLAYED ERROR CODES PRINTER ERRORS Co Err Communications timeout when communicating with a printer This will be due to either to the printer being disconnected loss of power to the printer or the printer malfunctioning PAPER No paper in slip printer PRINT Original ticket must be printed before the next delivery can be started HAND HELD COMPUTER ERRORS HH Err Communication timeout when communicating with a Hand held computer This will be due to either the Hand held being disconnected loss of power to the Hand held or the Hand held is malfunctioning d LOAd Totals Report must be down loaded to the Hand held before the next delivery can be started HH busy The Totals Report has been down loaded but the Trac 40 requires a Transaction Complete message to be sent from the Hand held before the next delivery can be
44. ledge the error or the STOP key is pressed When the Trac 40 receives a T command from the Hand held it responds by sending the Delivery Report string with a checksum attached If the Hand held detects that the checksum is incorrect then the Hand held should re request the Delivery Report If there are no errors the Hand held is then free to download any parameters preset size or density required for the next scheduled delivery At the earliest opportunity the Hand held should send a TC command Transaction Complete to the Trac 40 to indicate that it has completed any essential interrogation required and allow the Trac 40 to start a new delivery and totalise any incoming flow On receipt of the TC command the Trac 40 will reply with the Delivery Status ID S00 The Hand held can using the DC Delivery Commence command start a new delivery If the unit has not received a TC command it will not start a new delivery or be able to monitor any incoming flow and will respond to the DC command with a Delivery Status indication that the transaction is not complete If a delivery is attempted with a manual press of the RESET and the unit has not received a request for the Delivery Report then the error message d LOAd is displayed This can be acknowledged with the STOP key or by receiving a T via the serial communications If the error is acknowledged with the STOP key and there is no request for the Delivery Report before the 3 second timer
45. ls to 60 F against Relative Density 60 60 F Table 54A Correction of Volume for Generalised Crude Oils to 15 C against Density at 15 C Table 54B Correction of Volume for Generalised Products to 15 C Against Density at 15 C Table 54D Correction of Volume for Generalised Lubricating Oils to 15 C against Density at 15 C Based on the programmed density and the measured temperature the software derives a volume correction factor VCF The gross uncompensated rate is multiplied by the VCF to give the net compensated total For US units the density is programmed as the Relative Density SG and the volume is referenced to 60 F For Metric units the density is programmed as the Density in kg m and the volume is referenced to 15 C Five product groups are defined by the equations and during the Calibration routine the relevant product group must be selected The product groups and the relevant densities which can be programmed are as follows PRODUCT GROUP RELATIVE DENSITY DENSITY kg m Crude Oil 0 751 1 000 750 1000 Jet Fuels Kerosene Solvent 0 751 0 850 750 850 Gasoline 0 641 0 800 640 800 Lube Oil 0 851 0 960 850 960 Diesel Heating Fuel Oils 0 801 1 100 800 1100 When programming the density the values must be entered within these specified limits otherwise an error message will be displayed prompting the operator to check the parameters 36 6 5 4 6 5 5 Compensation for Lique
46. n the accumulated total must be set so that the accumulated total increments at less than 49 counts per second Note that due to the uneven pulse output spacing on this output the pulse output cannot be used to drive rate indicators Connector 1 Vout Auxiliary External Load Resistor 10K Logic Input Driving an Electronic Counter 28 5 7 END OF DELIVERY AND FLOW ALARM An End of Delivery signal is available on Connector 3 Terminal 7 The signal is an open collector output which will be in the on state once the End of Delivery is reached and will remain on until another delivery is commenced The End of Delivery output is identical to the Pulse Output shown in Section 5 6 The FLOW ALARM uses an identical circuit to the End of Delivery and is on Connector 3 Terminal 8 The Flow Alarm is used by the Quadrature Input if selected and will output an error signal if there is a difference between the input pulses as described in Section 6 1 The Flow Alarm output will switch on ie the signal goes low whenever an alarm condition exists The Alarm will switch off ie the signal goes high when the alarm is reset by pressing the STOP key Connection of End of Delivery and Flow Alarm are as follows Relay or Impulse Counter 5 6 ohms 33V DC Supply Seed Driving an External Relay or Impulse Counter DC Supply Out 8 24V External Load Resistor 10K Logic Input Driving a Logic Input such as a
47. ncy Cutoff prevents display and integration of the frequency input below xxxHz XXX Limited to 125Hz F dPt Number of decimal points with which the Rate is to be displayed between 0 to 0 00000 t base The Timebase with which the Rate is calculated must be entered as 60secs units min hours units hour FILTER The filter constant for filtering the rate display 1 No filtering to 99 Very heavy filtering If the Preset is disabled Step 13 is the Timeout If Preset is enabled the Timeout will be entered when entering the Batch Parameters TOUT The Signal Timeout in seconds setting to 00 disables this feature t dPt Number of decimal points with which the Net resettable total is displayed between 0 to 0 000 A dPt Number of decimal points with which the Accumulated non resettable total is displayed between 0 to 0 000 t c The type of Temperature Compensation can be selected as follows none No temperature compensation petrol Compensation for Petroleum products LPG Compensation for Liquid Petroleum Gas genliq Volume Correction for General liquids An_nH3 Compensation for Anhydrous Ammonia If none no temperature compensation is selected the program will go to Step 25 All other selections result in the following steps being displayed t Select either US units or metric units as the basis of the temperature compensation F US units Metric units With a direct RTD input the temperature can be adjus
48. ndards Chapter 5 Section 5 AS2702 1984 and ISO6551 1982 K factor Linear Single point 0 0001 to 50 000 Non linear 10 points 0 0001 to 50 000 Pulse Output Pulse Width 10mSec Maximum Duty Cycle 49 pulses per second Scaling The pulse output is scaled and outputs one pulse each time the accumulated total increments Temperature Inputs Input Signal RTD 4 wire RTD Type Platinum PT100 with coefficient of 0 00385ohm ohms C DIN Class A recommended Temperature Measurement Range 100 C 148 F to 200 C 392 Measurement Accuracy 0 1 C Input Circuit 12 bit A D converter Relay Outputs Two stage on off Maximum Switching Voltage 30Vdc or 30Vac Maximum Switching Current 3 Amps TEMPERATURE CORRECTION Volume Correction for LPG To API ASTM Tables 34 and 54 Accuracy 0 04 for metric 0 12 for US Temperature Range 45 C to 60 C 49 F to 140 F Volume Correction for Petroleum Correction to API ASTM tables as follows Crude Tables 24A and 54A Gas Jet Oils Tables 24B and 54B Lube Oil Tables 24D and 54D Accuracy 0 075 Temperature Range 100 C to 200 C 148 F to 392 F Volume Correction for General Liquids Correction to any temperature using a constant co efficient of volume expansion Accuracy 0 05 Temperature Range 273 C to 200 C 459 F to 392 F Volume Correction for Anhydrous Ammonia Temperature Range 0 C to 40 C 32 F to 104 F 3 OPERATIO
49. ng the input signals to be checked The calibration routine can only be entered by removing the CAL security screw on the rear panel and pushing a microswitch with a narrow tip through the back panel The key switch actions during Calibration are as follows RESET will change a flashing digit to the next digit TEST will increment a flashing digit or change scroll through a parameter selection DISPLAY will reset a flashing digit to zero PRINT STOP will step through the program sequences Note that the arrows with the RESET and TEST key switches indicate that these switches can be used to change and increment digits respectively In stepping through the program sequence the Parameter Description is always displayed first followed by the actual value or parameter When a value or parameter can be changed it is always shown as flashing and the LED s in the switch panels are lit if that key switch can be used to change a value On first entering the Calibration routine the display will show the sub menu level headings CAL Setup Program parameters BATCH Enter Batch parameters if Preset Mode is enabled in CAL RS232 Enter Communications parameters Real Time Clock if installed TEST Check Input Signals END Exit to Normal Operation The user can scroll through these sub menu level headings with the TEST key and then by using the PRINT STOP key can enter the appropriate menu To exit Calibration step through the Setup p
50. o flow for 3 minutes and incrementing the delivery number In non trucking applications it may be required to disable this feature This can be done during the setup mode 11 3 7 3 8 3 9 FREQUENCY CUTOFF A frequency cutoff can be programmed below which the flowrate is not registered The frequency cutoff will Prevent a pulse error if a turbine meter is used at very low flowrates where one coil may register a pulse before the second coil Prevent erratic counts due to vibration when there is no flow Input frequencies at or below the cutoff are registered as OHz This means that if the frequency is less than the cutoff for more than 3 minutes the unit will record an End of Delivery CLEARABLE MINIMUM TOTAL A Clearable Minimum Total can be programmed in calibration This value allows small totals resulting from pressurising the delivery system meter jump to be cleared without a ticket printout or transaction being required The value entered can be in the range of 0 to 99 and is entered as whole units ie litres gallons The clearable total should be as small as possible while still catering for the maximum meter jump during pressurising The value should only be entered by an authorised person and will be protected by the calibration seal At the End of Delivery if the delivery total is less than the Clearable Total the delivery total is reset to zero The Accumulated total from the end of the last delivery is
51. omputer gt rn i isa 1 This technique will ensure that the delivery information is always printed by the Trac 40 In metrology applications such as required in OIML R117 standards it is mandatory that the ticket is only printed by an approved device The dual printer port arrangement on the Trac 40 satisfies this requirement without having to have the Hand held certified The dual printer port will ensure that all delivery totals etc are printed direct from the Trac 40 while other information generated by the Hand held can be appended to the ticket 38 7 3 PRINTER COMMUNICATIONS 7 3 1 Printer Types The following printers are supported by the Trac 40 and are selected during Calibration PTYPE 00 Standard Computer Printer 01 Epson CTM290 Slip Printer 02 Contrec Model 624 Printer 03 Epson TM290 2 TM295 Slip Printer 04 Contrec Model 632 2 Printer Normally it is only necessary to connect the Data Out signal and the Signal Ground However the CTS input on the instrument also allows a Print Buffer Full or Request to Send output from the printer to be connected to the instrument This line is used only when the printer has a very small buffer and there is danger of overwriting the contents of the printer s buffer see operating manual for the printer For printers with buffer sizes of less than 1K bytes it is recommended that either the CTS line hardwire handshaking be connected and enabled in cali
52. or a Stop Delivery has been detected but End of Batch has not yet been reached Auto Flow has been detected Flow Alarm detected due to a temperature or dual pulse error midway through a delivery Delivery is complete and is about to print original ticket The Hand held can not communicate to the Trac 40 after this status code until the control is passed back to it from the Trac 40 with the next status Trac 40 is about to print duplicate ticket The Hand held can not communicate to the Trac 40 after this status code until the control is passed back to it from the Trac 40 with the next status code Delivery is complete but original ticket not printed due to previous paper or communications error Original still requires printing and may require operator intervention Delivery is complete but duplicate ticket not printed due to paper or communications error Unit is busy in calibration Batch set or Density set modes Delivery display test in progress The last delivery total was less than the Clearable Minimum Total and there is no Totals Report to be collected or printed This status is only given in response to a request for a Totals Report T or request to print a docket PR Trac 40 will reply with a DS to all commands if unit is in calibration change preset or change density modes The commands BVxx x and B are only recognised as valid commands when the instrument is programmed as Preset Mode The commands
53. ose to the RTD as possible With the direct RTD measurement the program automatically corrects for the non linearity in the RTD Connector 2 RTD Temperature Sensor Current Signal Twisted Pair Cable Shield When wiring the RTD care must be taken to ensure the of the current is connected to the same side of the RTD as the of the signal The RTD has no polarity and can be connected in either direction REMOTE RUN AND STOP SWITCHES A remote push button can be connected to the Model Trac 40 to either start a delivery or to stop and print a ticket The function of the switch is selected during the Calibrate routine to perform either but not both of the switch functions The switch functions are identical to the RESET and STOP PRINT switches on the front of the instrument The switch is wired as follows Connector 3 26 5 4 5 5 EXTERNAL CALIBRATION SWITCH for 410 enclosures only When the instrument is mounted in an EX 410 explosionproof enclosure the external calibration microswitch can be wired to the switch input on connector 2 on the back panel When not configured for mounting in an EX 410 enclosure these inputs are not used and have no function Connector 2 4 11 CONTROL RELAY OUTPUTS In the Preset Mode the two output relays can be set up to a control single valve or a dual valve with slow stop and or slow start Alternatively the second relay can be
54. r integrity test which will signal an error message if there is a printer problem 12 Volt DC and 24 Volt DC operation Communications The Trac 40 can operate in one of the following modes 1 No Printer Installed 2 Printer Only Interfaces to an industry standard slip printer or standard line printers 3 On board Computer With an on board computer transaction results can be uploaded to the computer at the end of the delivery This instrument conforms to the EMC Directive of the Council of European Communities 89 336 EEC and the following standards Generic Emission Standard EN 5008 1 1 Residential Commercial amp Light Industry Environment Generic Emission Standard EN 5008 1 2 Industrial Environment Generic Immunity Standard EN 50082 1 Residential Commercial amp Light Industry Environment Generic Immunity Standard EN 50082 2 Industrial Environment In order to comply with these standards the wiring instructions in Section 9 1 must be followed 1 1 PART NUMBER DESIGNATIONS Trac 40 01 Communications Option 1 Printer communications only 2 Computer and printer communications Enclosure and Connector Sealing Standard Enclosure unsealed connectors Standard Enclosure sealed connectors Explosion Proof Enclosure Metric glands Explosion Proof Enclosure NPT glands Panel Mount Enclosure unsealed connectors Panel Mount Enclosure sealed connectors 2 SPECIFICATION GENERAL
55. range allows volume correction for liquids of density 610 kg m to 1076 kg m Thermal Coefficients of Expansion at 15 C 60 F PRODUCTS DENSITY AT 15 C COEFFICIENT OF kg litre EXPANSION C LPG Propane 0 510 0 00290 Butane 0 580 0 00200 Aviation Gasoline 0 695 0 00120 Petrol 0 740 0 00110 Aviation Jet A 1 0 795 0 00094 Lighting Kerosene 0 790 0 00094 Power Kerosene 0 810 0 00087 Heating Oil 0 820 0 00087 Automotive Distillate 0 840 0 00084 Industrial Diesel Fuel 0 855 0 00082 Fuel Oil High Sulphur 0 980 0 00070 Low Sulphur 0 900 0 00075 Bitumen 1 020 0 00063 Crude Oil Bass Strait 0 796 0 00087 Benzene 0 880 0 00120 Toluene 0 870 0 00110 Xylene 0 860 0 00100 White Spirit 0 780 0 00095 Mineral Turpentine 0 820 0 00087 Lube Oils SAE 10 0 880 0 00077 20 0 890 0 00076 30 0 890 0 00076 40 0 900 0 00074 50 0 900 0 00074 Water 1 000 0 00031 35 6 5 3 Compensation for Petroleum Liquids The petroleum correction program uses the American Petroleum Institute equations described in API Standard 2540 For US units the equations leading to Table 24A 24B and 24D are used and for metric units Table 54A 54B and 54D equations are used These Tables are entitled Table 24A Correction of Volume for Generalised Crude Oils to 60 F against Relative Density 60 60 F Table 24B Correction of Volume for Generalised Products to 60 F Against Relative Density 60 60 F Table 24D Correction of Volume for Generalised Lubricating Oi
56. restored and the unit is ready for the next delivery to begin No ticket is printed and if the PRINT key is pressed the message No DEL No Delivery is displayed A value of 00 entered in calibration disables this feature OVERFLOW THEFT DETECTION If the End of Delivery has occurred but a ticket has not yet been printed or transaction is not complete and product flow is detected this extra flow is considered as an overflow or theft The error message Err 14 is displayed and additional flow is only added to the Finish Accumulated total This allows the Start and Finish totals to be reconciled and compared with the Delivery totals A status code of 200 is printed on the ticket to indicate that a theft or overflow has occurred When the additional flow stops a printout or transaction is automatically retried and the error message is cleared 3 10 LOSS OF POWER A supercap is used on the display board to retain totals if power is lost The last delivery total is written to the display as it powers down and the powerdown is regarded as End of Delivery All information for a complete ticket is stored on power down If power is lost during a delivery then on re powering the unit will automatically print an original ticket with the status and totals at the time of power loss A duplicate ticket can be printed on re powering 12 4 CALIBRATION The Calibration routine enables the Setup Parameters to be programmed as well as enabli
57. rogram Batch program RS232 program or Test program until the end and press the PRINT STOP key when END is displayed PRINTING THE CALIBRATION SETUP If the unit is optioned with serial communications a printer can be used to obtain a printout of the calibration setup for purpose of service amp installation records The printout is relatively unformatted with no printed lines exceeding 32 characters allowing a wide range of printers to be used for the purpose of this calibration report Obviously the communications setting ie baud rate parity etc of both printer and Trac 40 need to match The use of CTS will help with the longer printouts on those printers that have a limited buffer size ie less than 1K bytes The printout is initiated at the end of the Test portion of the calibration and is only available on units with EPROM versions 1 120 and greater 13 4 1 PROGRAMMING THE SETUP PARAMETERS Step Display Description 1 CAL Select the Calibrate mode to setup program parameters BATCH Select Batch to enter Batch Setup parameters RS232 Select Communication parameters and Real Time Clock if installed TEST Select the test mode to check input signals END Exit to normal operation The following steps are displayed if CAL is selected 2 TRUC ID Vehicle Identification Number XXXXXX Enter a number to identify the truck 3 FLO SN Flowmeter Serial or Identification Number XXXXXX Enter a number to identify the flowmeter 4 PR
58. run other equipment The battery acts as a large capacitor and filters noise and therefore wiring power wires as close to the battery as practical will ensure a clean supply voltage Connectors and Junction Boxes If inline connections must be used make sure they are high quality and rated for signal applications Do not use connectors designed for heavy power applications as these use materials which may be prone to intermittency when low power signals are connected through them Gold plated connectors are preferable Avoid junction boxes where possible as these collect water and condensation Routing Wire Keep signal wires away from power wires which may have high levels of electrical noise Shield all signal wires with the shield connected at the Trac 40 end only ENCLOSURE The standard Trac 40 is housed in an IP66 Nema 4X enclosure designed for mounting in the cab or another protected area of the vehicle If the Trac 40 is to be mounted outside and directly exposed to rain it is recommended that it is mounted in a sealed enclosure with a door that can be opened to provide access to the Trac 40 during delivery The explosion proof Trac 40 is suitable for mounting outdoors 57 9 6 TRAC 40 CONNECTIONS Connector 1 9 way female Pins 5 0 Volts auxiliary Connector 3 15 way male optional 9 Vout auxiliary Pins 4 Chassis Ground 8 CTS 1 0 Volts Common 3 RS232 Data Out Printer 9 Vout auxiliary 7 0 Volts Common 2
59. se Unfiltered Response Time As a guideline to the degree of filtering to be used the following table shows the response to a step change in input The value A is the filter constant which is programmed during the Calibration routine The times for the display value to reach 90 and 99 of full swing are given in seconds for different values of A A 90 99 1 0 0 2 1 2 4 2 4 6 3 6 10 5 11 15 8 17 20 11 22 25 14 28 35 20 40 45 25 51 60 34 69 75 43 86 90 52 103 99 57 113 Response to a Step Input in seconds Note that if A is set to 1 there is no filtering of the input signal 33 6 5 6 5 1 TEMPERATURE COMPENSATION Temperature compensation gives the instrument the capability to correct for changes in volume of the measured liquid with temperature There are three methods of compensation which can be selected 1 Volume correction for general liquids using a thermal coefficient of expansion with temperature This method is useful for correction to a base volume over relatively small changes in temperature 2 Correction for Petroleum Liquids to US and International standards for a wide range of petroleums to a base temperature of 60 F 15 C 3 Correction for LPG to US and International standards to a base temperature of 60 F 15 C 4 Correction for Anhydrous Ammonia to a base temperature of 60 F 15 C South African Version A special version of the software is available with correction to 20 C in
60. started GENERAL ERRORS 03 Loss of calibration data must re enter data 04 Loss of totals 11 Invalid input configuration programmed 12 The Temperature or Density Input is out of range 13 Quadrature flow error due to missing pulses on a pulse input channel See Section 6 1 1 for further description 14 Overflow or theft has occurred while the unit is waiting to complete the printout or transaction See Section 3 8 for further description 15 Real Time Clock communication error 16 Loss of Real Time Clock The clock must be reset 18 Quadrature flow error due to simultaneous pulses on both pulse input channels See Section 6 1 1 for further description 32 Density value invalid must re enter value Power was lost before the initialising routine had been completed GENERAL MESSAGES Prntng Displayed while serial data is being sent to the printer No dEL Displayed if the PRINT key is pressed when the last delivery total was less than the Clearable Minimum Total OUTPUT ERRORS 21 Invalid output configuration 22 Communications error Baud rate not set 54 8 2 PRINTED ERROR CODES STATUS CODES PRINTED ON THE DELIVERY DOCKET 000 012 013 100 200 No errors during the last delivery Temperature error occurred during the last delivery A Dual Pulse Flow error occurred during the last delivery Power failed during the last delivery Overflow or Theft was detected before ticket could be printed Not
61. stead of 15 C This version can be identified by the software version see Section 4 4 Step 2 SAx xxx for correction to 20 C Srx xxx for correction to 15 C 60 F Temperature Input A PT100 Platinum RTD is used to measure the fluid temperature A four wire temperature measurement is used to give high accuracy and internally the software will compensate for the non linearity of the RTD The RTD must have a temperature coefficient of resistance of 0 00385ohm ohm C and the highest accuracy DIN Class A is recommended During calibration a temperature adjust facility enables the temperature reading to be adjusted This allows for manufacturing tolerances on the RTD to be corrected 34 6 5 2 Volume Correction for General Liquids For general liquids a linear correction factor can be applied to give volumetric flow at base conditions The flow equation is Volumetric Flowrate 1 Tp a Volume Corrected Flowrate where T is the flow temperature C or F T 15 the base temperature C or F a 15 Thermal Coefficient of Expansion per C or F The Thermal Coefficient of Expansion a for a liquid can be determined empirically or can be found in chemical engineering texts A list of coefficients is given below for a number of petroleum products at 15 C The correction for General Liquids using a Thermal Coefficient of Expansion has been limited to a range of 0 000486 C to 0 001674 C This
62. ted offset to correct for the RTD tolerance ADJ t Adjust the temperature displayed during Test XX XX Input the offset The first digit is 0 for positive or for negative This is for fine adjustment only and is limited to 0 3 of a degree 15 Step Display Description Program steps 19 to 21 depend on which option for temperature compensations was selected in Step 16 and are individually described Volume Correction for General Liquids 19 REF F Program the base temperature for the compensation Enter the C temperature in F or C depending on the units selected in Step 17 20 COEF A Enter the thermal coefficient of change a as a Hence if the coefficient of expansion is 0 0029 C enter the change as 0 29000 The program will now go to Step 21 Petroleums 19 TYPE Select the Petroleum type CRUDE Crude oils as per tables 24 amp 54 OILS Fuel oils amp heating oils and diesel tables 24B amp 54B 19 cont LUBE Lube oils as per tables 24D amp 54D JET Jet fuels kerosenes and solvents tables 24B amp 54B GAS Gasolines and naphthenes tables 24B amp 54B 20 dn 60 F If US units are selected this is the Relative Density SG or dn 15 C If Metric units are selected the Density at 15 C in kg m is programmed Only values within the appropriate density range will be accepted The program will now go to Step 21 Liquid Petroleum Gas 19 dn 60 F If US units are selected the Relative D
63. ue that the instrument has accepted This is the same as for a D command Set New Time and Date This command allows the time and date to be changed in the instrument All values including the separators are sent as ASCII characters The data is tested against the limits that are applicable to the product type selected in calibration The unit responds with the new time and date as confirmation in the same form as for the C command Stops a delivery This is the same as pressing the Stop key on the front facia A Delivery Status message is returned on receipt of this command The DH can also be used to acknowledge a flow alarm or temperature error in the same way as the Stop key is used Informs the Totaliser that the Hand held has completed its printing or transaction recording This allows the totaliser to monitor any incoming flow A Delivery Status message is returned on receipt of this command Start a Delivery This is the same as pressing the RUN key on the front facia A Delivery Status message is returned on receipt of this command Request to print a docket Original or Duplicate A Delivery Status message is returned on receipt of this command Only useable in the combined printer and Hand held mode Request Delivery Report totals The unit will respond with the current totals information as at the time of the request To obtain the totals for a completed delivery the request must be made after the End of Delivery The unit
64. um attached to the end just prior to the terminating carriage return and line feed The check sum is a 2 s complemented sum of all the bytes in the string prior to the terminating carriage return Therefore a simple addition of all the bytes received by the Hand held up to and including the check sum but not the carriage return should give a resultant sum of 0x00 hex for a string with no errors 48 7 7 COMMANDS AND RESPONSES Commands sent to the instruments consist of the frame start character colon and two ASCII characters If the command includes a value such as a batch quantity the value follows immediately after the two character command Commands can be sent in upper or lower case Unrecognised commands are answered with a Invalid Command message from the instrument Single Instrument Communications If a single instrument is connected to a computer the ID number for that instrument should be programmed during the instrument Calibration procedure to ID 0 All commands issued by the computer will always be accepted by the instrument and there is no need for the computer to address the instrument with an ID number However if there is a requirement for the unit to have its own unique ID number for communications this can be programmed in calibration This also allows the unit to be selected or de selected An instrument is selected by the computer sending the command IDx where x is the ID number Once selected an
65. y cleared by the Trac 40 receiving a TC Transaction Complete command or be acknowledged with the STOP key 10 At any time the Trac 40 can be interrogated by the Hand held to monitor rate temperature totals or status 43 7 4 2 Polling Mode In the Polling Mode all communications are initiated by the Hand held computer By regularly polling the Trac 40 for the Delivery Status the state of the Trac 40 can be determined such as End of Delivery and the requirement to record a transaction Operation is as follows Note A full description of all Commands and Status Codes used is given in Section 7 8 of this manual 1 10 11 The Hand held continually polls the Trac 40 with a DS Delivery Status request and the Trac 40 responds to these with the Delivery Status comprising of the ID number and Status Code At the End of Delivery EOD the Delivery Status number changes to indicate that a delivery has just completed and a new delivery report is ready to be downloaded from the Trac 40 The Trac 40 waits for 3 seconds to be polled or receive the T request for Delivery Report If the 3 second timer expires before a request is received the Trac 40 displays the error message HH Err to indicate there has been no request from the Hand held While the HH Err is being displayed the serial communications is monitored The error continues to be displayed until either a T request or DH command is received which will automatically acknow
66. y of the commands relevant to that instrument can be sent by the computer without having to again select the instrument Likewise an instrument can be de selected by sending the same ID command with a number not equal to the instruments ID It is also possible to determine if an instrument is currently selected by sending the command ID without the value x On receiving this command the selected instrument will reply with its ID number 49 The following computer commands are supported by the Trac 40 to allow greater flexibility and control from the Hand held Commands BVxx x RDdd mm yy yy_hhlmmlss DC T The instrument ID number and the value either 1 or 2 ASCII characters depending on the value No serial response is returned New batch preset value to be entered The value xx x is a variable length field All values including the decimal are sent as ASCII characters The value is tested against the limits entered under BATCH in calibration The unit responds with its ID number and the batch preset value that the instrument has accepted This is the same as for a B command New Density value to be entered The value xx x is a variable length field All values including the decimal are sent as ASCII characters The value is tested against the limits that are applicable to the product type selected in calibration The unit responds with its ID number and the density val

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