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1. Serial Communications chapter for details of the RS232 wiring connections Plug in connector 9 pin male D type Shield Connection with optional memory chip viewed from solder end of connector 1 Excitation Chip viewed from flat side CF 112 2 Version 3 1 0 3 FUNCTION TABLES SUMMARY OF SETUP FUNCTIONS Functions in this first table are available in FUNC or CAL mode Display et ee eee TET Calibration memory selection cH i CHE CH3 or CHR ews 44 Display rounding Toso o n SSS 12 Memory chip address ites S 3 Decimal point place two Ja Ja Digital filter Gto 8 o A Functions in this second table are available only in CAL mode record oo mV V input range 5 10 2 f Sample rate in samples sec User pushbutton function Pc Live input calibration first point Fay EE value a amp Second point for live input Any display calibration value Alternative mV V calibration 999 or method 2999 CAL Calibration offset Any display ESE value eero Zero range limit rn a a 2E m 2er ee Zero i li 3 Baud rate for serial igen communications eoo 480 a Gen 9 2 or 38 4 Pet Parity for serial input AGAE EUEN g P ut Output for serial communications di SP Cant Pie i OT A buS Addr Instrument address for serial Otoi communications CF 112 3 Version 3 1 0 4 EXPLANATION OF FUNCTIONS The DFI 200 setup and calibration functions are configured through2. 200 with both serial and load cell connectors This dual lead arrangement allows for a convenient connection to the load cell and RS232 serial port Note an adaptor may be required to allow connection directly to a serial port CF 112 15 Version 3 1 0 Load cel connector armala male connector RS232 connector temale F L Connectors viewed irom solder side 9 Pin female to bad cell S AA a Connections to k i 64 5 required if nl i O external memory a chip is usec Se a J 5 bon Plug in connector 9 it ah pin male D type 1 Exctation ae li Sional lt a i __ 4 n Hr i H Excitation 5 E Shieki 9 Pin temale AS232 i T ni D A F aiig a Fin aloe Sac C g F i Ee 6 3 Serial communications function settings and commands With the communications enabled the following extra functions will be seen these function should be set to match the settings on the PC or other device which the DFI 200 is communicating with bAudr AEE set baud rate Select from 300 600 eD dZ 00 5800 9600 19 2 or 38 4 baud PrE amp set parity Select parity check bit to either NONE EUEN or Odd CF 112 16 Version 3 1 0 D P UE set RS232 485 interface mode Select d SP Contor POLL Alows user to select the RS232 485 interface operation as follows e d SP Sends image data from the display without conversion to ASCII This mode is intended for use only when the DFI 200 i
3. 31 Allows several units to operate on the same RS485 interface reporting on different areas etc The host computer or PLC may poll each unit in turn supplying the appropriate address The unit address ranges from 0 to 31 DEC but is offset by 32 DEC to avoid clashing with ASCII special CF 112 12 Version 3 1 0 function characters such as lt STX gt and lt CR gt Therefore 32 DEC or 20 HEX is address 0 42 DEC or 2A HEX is address 10 Refer to chapter 6 for further details 4 22 Returning to normal measure mode When the calibration has been completed it is advisable to return the instrument to the normal mode where calibration functions are less likely to be tampered with To return to normal mode turn off power to the instrument wait a few seconds and then restore power 4 23 Error Messages e This message indicates that the mV input is higher than the DFI 200 is expecting This could be due to an incorrect fF function setting or an incorrectly wired or faulty load cell e Or This message indicates that the DFI 200 is being asked to display a number which is too large i e a number greater than 19999 or less than 19999 Check that the instrument has been correctly calibrated and that the display range required is not greater than the number of ee on the display CEP DF SE Err This message means that the eer it 36 function setting has stopped the zero operation If you wish to proceed with the zero
4. a memory device has had an address set then the address can be viewed or altered at this function The procedure for setting or altering an address is as follows 1 The EAHFiLfunction must be set to either E H A t i e a memory device must be connected 2 With the external memory device connected enter function mode and step through to the Unit function 3 Use the a or v arrow to select the required address for that chip then press F to accept the change The address selected will now be stored in that memory device The same address can be allocated to more than one memory device and the address of a device can be changed at any time by following steps 1 2 and 3 above 4 4 Decimal point place Display GLPE Ca Peri Range uto Guus CF 112 5 Version 3 1 0 Default Value u Displays and sets the decimal point place By pressing the a or v pushbuttons the decimal point position may be set The display will indicate as follows no decimal point L d 1 decimal point place oe 2 decimal point places or EHHE 3 decimal point places 4 5 Digital filter Display Ft tr Range LI to Default Value a Displays and sets the digital filter value Digital filtering uses a weighted average method of determining the display value and is used for reducing display value variation due to short term interference The digital filter range is selectable from F to where i none and g most filtering Use a or Y at the Ft tr functio
5. a push button sequence Two levels of access are provided for setting up and calibrating namely a e FUNE mode simple push button sequence allows access to calibration channel selection display rounding decimal point and digital filter settings only e EAL mode power up sequence plus push button sequence allows access to all functions including calibration parameters Once ERtor FURE mode has been entered you can step through the functions by pressing and releasing the F push button until the required function is reached Changes to functions are made by pressing the or v push button in some cases both simultaneously when the required function is reached Any changes to a function will not be saved until the F button is pressed to accept the change Entering EAL Mode Entering FUNE Mode 1 Switch off the instrument Hold in the B bution and switch on The display will indicate No power up Sequence required CAL as parl of the wake up messages when the CAL message is seen you can release the button 1 Switch on the instrument When the wake up messages have finished and the display has settled down to its normal reading press then release the B button 2 When the wake up messages have finished and the display has settled down to its normal reading press then release the a button 2 Within 2 seconds of releasing the 8 button press then release a Within 2 seconds of releasing the G
6. button press then release Five yt the A and amp buttons Py A the B and amp buttons together The display will J aN together The display will now indicate FUNC followed now indicate FUNE followed by the first function J by the first function 4 1 Calibration internal memory selection Display E HAL Range CH1 CH2 L H Jor H A Default Value CH1 Selects one of the three possible calibration internal memories CH1 CH AS also L H A tif the optional external memory chip is used see chapter 4 24 The H iLfunction allows the instrument to be calibrated to up to 3 different load cells and hold the calibration values in internal memory Alternatively 3 different calibration CF 112 4 Version 3 1 0 scaling values may be entered for a single cell allowing the same cell to display in different units e g Kilonewtons Kilograms and Tons The user may select the load cell to be used via this HFTLfunction or via the User pushbutton if the pushbutton has been programmed for this purpose see ui SEP function To scale any of these independent calibration memories you may use either the e 1 aut and Hine aLL C methods or the EL AL E SLL method Simply select the required cell number prior to scaling then scale using whichever calibration method best suits the application The channel selected will always default to LHI or L A if external memory is used at switch on In addition to in
7. function provides an alternative calibration method to the LAL fand LAL method of scaling note that only one of these methods should be used The EL AL method allows the known rated mV V value of the load cell to be entered followed by the maximum capacity of the load cell in whatever measuring units are required The mV V value is entered to 3 decimal places 3 decimal places will automatically appear up when you enter EL AL Maximum E amp Ait value is 9 999 If an the mV V figure is greater than the DFI 200 allows you can divide the EC ALandE SL values by the same amount to give the correct scaling e g for a display with an 18 000mV V input with a full scale reading of 1000 you could enter the EL AL value as 9 000 and the 3 L value as 500 Note Steps 1 to 6 which follow can be completed with or without a load cell being connected step 7 required the load cell to be connected The EL AL E SOL procedure is as follows 1 At the AL function press then release Band v simultaneously to enter the ECAL mode 2 The display will show the previous mV V value or the mV V value calculated by the DFI 200 if its last scaling was via LAL fand LALE Use the a or hd pushbutton to enter the known rated mV V value of your load cell 3 Press F to store this mV V value in memory 4 The display will now show E StL followed by the previous scale value 5 Use the a or v pushbutton to enter the full scale value of your load cell in the measur
8. load For example if the manufacturer states that the load cell has a 2 000mV V output and LA fand CFL 2 were carried out at 0 and 50 of rated load then the EL AL reference value you would expect to see would be approximately half of the rated mV V i e approximately 1 000 mV V 4 12 Calibration offset Display L AL F F SE Range Any display value Default Value n a Allows the instrument calibration to be offset by a single point value This value is added or subtracted across equally the range of the instrument This scaling method is used to correct for a constant error in the reading The procedure is as follows 1 Press then release a and v simultaneously to enter the LAL OF Se function The display will show the current display value 2 Press the F button The display will show SLL followed by the previous scale value 3 Use the a v button to alter this scale value to the required reading for the current input load 4 Press F to accept the new scale value The display will show ur SE E Ad to indicate that the offset calibration scaling has been completed 4 13 Zero range limit Display EF OF SE m r mri Range ur or TDU Default Value i The zero range function is expressed as a percentage of full range 0 0 to 100 0 The full range input is calculated by the LL figure minus the SLL i figure for 2 point calibration or the ESLL figure if CELAL calibration is used If the display value as a percentage of ra
9. model identifier e g Ht X X is the version number e g 0 1 lt CR gt is a Carriage Return 13 Dec OD Hex CF 112 18 Version 3 1 0 4 Invalid Command If the command received from the host is not valid then the unit may return the following lt ACK gt A lt CR gt Where lt ACK gt is Acknowledge 6 Dec 06 Hex is the character 63 Dec 3F Hex A is the responding units address lt CR gt is a Carriage Return 13 Dec OD Hex If the address received from the host does not match the units address then the unit will not respond at all 7 SPECIFICATIONS 7 1 Technical specifications Input Ratiometric 4 wire strain gauge Input Sensitivity 80Q to more than 20000 Excitation 5VDC Accuracy Up to 0 005 of full scale for alarms and display depending on sample rate etc see resolution table which follows Using and t calibration method accuracy is 1 Sample rate 5 to 100 sample per second selectable ADC Resolution Up to 22 bits depending on sample rate and mV V input see 7 4 Display update Up to 4 per second apparent update varies with F Ltr setting Conversion Method Sigma delta Microprocessor HC68HC11F CMOS Ambient temperature 0 to 500 C Humidity 5 to 95 non condensing Display 4 5 digit LCD 11 7mm digit height display range 19999 to 19999 Power supply Battery 9VDC type 216 alkaline recommended Battery life Typically 15 hours when switched on with 350 load cell con
10. CY COOFE amp SYSTEMS DFI 200 HAND HELD INDICATOR OPERATION MANUAL 1 INTRODUCTION This manual contains information for the operation of the DFI 200 hand held load cell monitor The DFI 200 is suitable for measuring weight pressure force torque etc The input required by the DFI 200 is a 4 wire mV V output type transducer 5V excitation is provided for the transducer Calibration and set up functions are easily achieved via front pushbuttons The DFI 200 is a high accuracy meter with the capability of high speed sampling Sample rate is programmable in steps from 5 to 100 samples per second The instrument has a full scale range of 0 5mV V to 100mV V Up to 3 separate calibration sets can be stored internally allowing viewing of scaling for up to 3 different load cells or 3 scaling ranges without the need to recalibrate each time When used with the external memory option the DFI 200 can read the calibration scaling values stored in memory in the load cell connector shell The instrument can then display the correct scaling value for each individual load cell which uses a memory device without the need for recalibration The DFI 200 is supplied with RS232 communications as standard but by default this is disabled See Serial communications chapter for internal DIP switch settings required for enabling the serial communications The DFI 200 has three calibration scaling method options It may be calibrated by applying two known we
11. c filter setting of 8 the number of divisions is 2965820 2 Resolution uV at 14 5 bits 2 5 mV x 10 23170 1 08yV Resolution uV at 21 5 bits 2 5 mV x 10 2965820 0 0084uV 8 WARRANTY Limited Warranty on Products Any Cooper Instruments product which under normal operating conditions proves defective in material or in workmanship within one year of the date of shipment by Cooper will be repaired or replaced free of charge provided that a return material authorization is obtained from Cooper and the defective product is sent transportation charges prepaid with notice of the defect and it is established that the product has been properly installed maintained and operated within the limits of rated and normal usage Replacement or repaired product will be shipped F O B from our plant The terms of this warranty do not extend to any product or part thereof which under normal usage has an inherently shorter useful life than one year The replacement warranty detailed here is the buyer s exclusive remedy and will satisfy all obligations of Cooper whether based on contract negligence or otherwise Cooper is not responsible for any incidental or consequential loss or damage which might result from a failure of any and all other warranties express or implied including implied warranty of merchantability or fitness for particular purpose Any unauthorized disassembly or attempt to repair voids this warranty Obtaining Servic
12. dependent calibration scalings for each channel selected each channel can be assigned different decimal point ae Pe digital filter F LE mV V input range RISE and sample rate FEE settings 4 2 Display rounding Display dead Range to Sogo Default Value Displays and sets the display rounding value This value may be set to 1 5000 displayed units Display rounding is useful for reducing the instrument resolution without loss of accuracy in applications where it is undesirable to display to a fine tolerance To set the display rounding value go to the amp emed function and use the a or v push buttons to set the required value then press F to accept this selection Example ri If set to 4 the display values will change in multiples of 10 only i e display moves from E to eu to JD etc 4 3 Memory chip address Display H E Range to dS Default Value 755 This function is only seen when an external memory chip is connected This function is used to display or set a unit address to one or more optional external memory devices For identification purposes each device should be allocated a different address if more than one external memory is used When a sensor with a memory chip is plugged in the Lim E function can be used to view the address of the memory device The address can be set from f to d S Ifthe default address 2 is seen this indicates that the device has not had yet had an address set If
13. dure below 1 Switch on the DFI 200 by pressing the On Off pushbutton 2 When the unit has powered up press then release F then press the Max UP and Min DOWN buttons simultaneously the display should show the message FUNC momentarily 3 At to the AFiLfunction select CHA i 4 Go to the 7 Efunction and select an address other than 255 5 Continue pressing and releasing the F button until the FURE E mid message is seen The external memory stores the unit address calibration slope and zero offset values and these are read by the DFI 200 when it is connected to the external memory The scaling values are used to display the stored calibration for the load cell to which the external memory is connected The external memory does not return EL ALand ESEL values to the DFI 200 therefore the E L ALand ESEL values in the DFI 200 will be those of the last cell calibrated not necessarily those of the cell connected Do not view the EL A Land E SE L settings when external memory is connected unless you wish to recalibrate the load cell since the calibration slope information for these settings will be overwrite the calibration slope in the external memory chip See Chapter 1 for details of electrical wiring for the memory device Calibration and setup with external memory The calibration and setup procedures are identical those described in the Explanation of Functions chapter If connected to a load cell with an external memory device the
14. e input values to scale the instrument The method is as follows 1 Enter the setup functions via amp Mt mode and choose the required channel number at the E AF Lfunction The channel number selected will be the channel for which this calibration scaling operation applies i il i 2 Step through the functions by pressing and releasing the F button until the display indicates LAL 3 Press then release the and buttons simultaneously to enter the calibration functions 4 The display will now indicate LAL 1st calibration point followed by a live reading 5 Apply a known input to the instrument of nominally 0 this value is not critical and may be anywhere within the measuring range of the instrument For example you could arrange that the load or pressure is zero at this time When the live reading has stabilized press the F button 6 The display will indicate SCL1 scale 1 followed by the scale value in memory 7 Use the D or button to obtain the required scale value 8 Press the F button the display will now indicate E A Ed indicating that calibration of the first point is complete CF 112 T Version 3 1 0 9 The display will now indicate LALE 2nd calibration point If you do not wish to enter the second point at this stage then press and release the F button until the FYNE E lt tmessage is seen If you wish to enter the second point at this stage press the D and Y buttons simultaneously 10 The display will
15. e under Warranty Advance authorization is required prior to the return to Cooper Instruments Before returning the item contact the Repair Department c o Cooper Instruments at 540 349 4746 for a Return Material Authorization number Shipment to Cooper shall be at buyer s expense and repaired or replacement items will be shipped F O B from our plant in Warrenton Virginia Non verified problems or defects may be subject to a 100 evaluation charge Please return the original calibration data with the unit Repair Warranty All repairs of Cooper products are warranted for a period of 90 days from date of shipment This warranty applies only to those items that were found defective and repaired it does not apply to products in which no defect was CF 112 20 Version 3 1 0 found and returned as is or merely recalibrated It may be possible for out of warranty products to be returned to the exact original specifications or dimensions Technical description of the defect In order to properly repair a product it is absolutely necessary for Cooper to receive information specifying the reason the product is being returned Specific test data written observations on the failure and the specific corrective action you require are needed CF 112 21 Version 3 1 0
16. ec 20 Hex for a positive value or X is the ASCI character 45 Dec 2D Hex for a negative value YYYY is the display value in ASCH number of digits depends on number of display digits eg 4 digits plus decimal point if used for a 4 digit display CR is the ASCI Carriage return character 13 Dee 0D Hex e g f the display is showing 1234 then the instrument will send 02 31 32 33 34 0D HEX to the host Poll commands Host Controlled Transmit Mode This mode requires a host computer or PLC to poll the instrument to obtain display or other information or reset various setpoint parameters Communications software often known as a terminal program is required when using POL E mode When polling the DFI 200 it is essential that the command characters are sent with less than a 10mS delay between them This means that each command line must be sent as a whole string e g lt STX gt PA lt CR gt is sent as one string rather than lt STX gt on one line followed by P etc If testing using a terminal program this is normally achieved by allocating a command string to a function key Whenever the function key is operated the whole string is sent The format used is ASCII 8 data bits 1 stop bit so for instance if address 1 is used then the string lt STX gt PA lt CR gt would typically be put into the terminal program as BP M Where B is the ASCII character for STX P is the command line to transmit the primary display value i
17. he set zero point is entered when the load cell is installed and in a no weight condition To operate the set zero function press then release a and simultaneously a live reading will be seen Press the F button to zero the display The message eff ene will be seen to confirm that the operation has been completed If the zero point set by this function is lost due to subsequent front pushbutton zero operations then it can be recovered via the Lif Cer D function see below The SEE CE U function operates in the same manner as the Zero pushbutton on the instrument The input at the time of the 2EE CE U operation will now show as a zero display but the calibration scaling slope is not affected 4 16 Clear zero Range n a Default Value n a Clear zero the clear zero function allows the zero point to be set back to the position programmed at the SEE cE U function Press the a and v buttons simultaneously to execute this function The message End will be seen to confirm that the operation has been completed 4 17 Power off time Display PUP F Range uw to su CF 112 11 Version 3 1 0 Default Value Power off time selects the automatic power off time in minutes This function allows the instrument to conserve battery power by automatically powering down if a button has not been pressed for the number of minutes selected Selections allow range from 0 to 300 minutes If 0 minutes is selected then the instrument will not automa
18. ights to the load cell or by entering the mV V value for the load cell or via a single offset value Displays maximum value in memory or used as UF button n CAL or FUNC modes Switch off or hold pressed for 3 seconds to reset memory 41 5 digit 11 7mm 19999 to 19999 LCD display Displays minimum Value in memory or used as DOWN button in CAL or FUNE modes switch off or hold pressed for 3 seconds to reset memory Used to allow entry to CAL or FUNC modes and to step between setup functions This button may be programmed to operate as either tare display hoki peak hoki or channel toggle pushbutton In CAL or FUE mode this bution can be used to exit fo measurement mode arto abort a at function change without saving load oallsirein bridoe meter On Off pushbutton Note that the instrument cannot be switched off whilst in CAL or FUNC moda Zero pushbotton Hold pressed for 2 3 seconds to zero see c EDI MJE function if dispky will not zero CF 112 1 Version 3 1 0 2 ELECTRICAL CONNECTIONS Power for the DFI 200 is provided by a 9VDC 216 battery The battery cover is located at the underside of the case External connections to the DFI 200 are made via a 9 pin D male connector The DFI 200 provides 5VDC excitation for the mV V output transducer Electrical connections are as shown below Refer to External memory chapter for details of the optional external memory chip Refer to
19. ing units you are using e g kilograms tons etc 6 Press F to accept this new value Note it is important that the actual full scale value for the cell i e maximum rated load is entered and not simply the maximum load it will be used to in your application 7 Once the E Si tL value has been entered connect the cell to the instrument With zero load on the cell use either the SE t CE U function or operate the Zero button This operation is required to give a zero load reference point to the instrument to eliminate any zero offsets present in the load cell CF 112 9 Version 3 1 0 cr Cie w Pr bk Use of EL Land ESL Lt as reference values Note do not use this facility if an optional external memory chip is connected If using the two point calibration method LA fand CRLe the mV V value and scale is automatically calculated and stored at the EL Aland 24L L functions After calibration using EAL tand EFL the EOC Ri and StL values may be viewed and a note taken of their value ensure that you do not change either the EC Aor amp SLL values whilst they are being viewed If the instrument is accidentally recalibrated incorrectly the EC ALand StL values recorded can be re entered to scale the instrument back to the same load cell Note that the mV V reference value stored at the EL AL function will only match the manufacturers rated mV V value for the load cell if AL tand EPt were carried out at exactly 0 and 100 of rated
20. n to alter the filter level if required Note that the higher the filter setting the longer the display may take to reach its final value when the input is changed similarly the relay operation and any output options will be slowed down when the filter setting is increased To set the digital filter value go to the F Lt function and use the a or v push buttons to set the required value then press F to accept this selection 4 6 mV V input range Display PoE Range 2 5 1 0 2 5 5 0 10 25 50 80 Default Value c 3 Displays and sets the mV V range to suit the transducer useable range Choose the value equal to or the next higher value to the mV V output of the transducer This selection sets the input range for the A D converter If too low a range is selecteda 7 7 7 error message will be seen on the display If too high a range is selected the full resolution capability will not be used and problems with calibration can result 4 7 Sample rate Display REE 5 70 75 20 30 480 50 60 80 or foo ir T Range Default Value Sample rate for ADC Displays and sets the ADC sample rate from 5 to 100 samples per second The faster sample rates can be utilized in features such as peak hold and peak valley memory 4 8 User pushbutton function Display USE Range HHH tArE od Atlea FP HL CMFIL OT A ac Default Value Mute In normal measurement mode the User push button can be programmed to operate in one of the modes described belo
21. n you simply need to ensure that the channel you wish to calibrate H A 1 is selected prior to any calibration or setup The 4 channel should automatically be selected when the DFI 200 detects that a memory device is connected Taking readings with external memory Once the load cell with external memory is connected to the DFI 200 the instrument will automatically display the calibrated scaling figures for that load cell Simply ensure that the required channel H A is selected prior to taking a reading The E H A channel should automatically be selected when the DFI 200 detects that a memory device is connected CF 112 14 Version 3 1 0 6 SERIAL COMMUNICATIONS 6 1 DIP switch settings The RS232 communications can be enabled or disabled via a DIP switch SW 7 located at the display end of the DFI 200 circuit board Switch 3 of this DIP switch is used to switch the communications facility on or off as detailed below To gain access to the DIP switch remove the four screws at the rear of the DFI 200 case and remove the back The back is connected to the circuit board via a ribbon cable there is no need to unplug this cable Once the back is removed SW 7 should be visible at the top edge of the circuit board SW SW Switch 3 off Communications disabled Switch 3 on Note Switch 1 should Communications enabled always be in the ON position 6 2 Electrical connections The diagram below shows the electrical connections for a DFI
22. nected Low battery warning Lo bAEL E message plus beeper Output standard RS232 serial communications 7 2 Options External memory Memory chip 9 pin D connector and shell 7 3 Physical characteristics Dimensions 80mm w x 145mm I x 39mm d Connections 9 pin D connector female at instrument end Weight 250gms including battery 7 4 Resolution table Effective resolution bits for DFI 200 over full scale mV V input CF 112 19 Version 3 1 0 Samples sec O 5mV V ImV V 2 56mV V bmV V L0mV V 25mV V 50mV V OT 100mV V a fes fes frs fes Too fio Tu s fes fies rs fes fs Moo foo w fiss fes rs eo fis fiss ss Z ee e a a e e wo uo Juo as fus so so us Note Figures in the table above apply when the digital filter setting is 0 Add 0 5 bits effective resolution for each step on the digital filter setting e g if the digital filter is set at 4 add 2 bits of effective resolution to each of the figures in the table above Resolution in uV can be calculated using the resolution in bits figures above These uV resolution values are calculated by the following method Resolution uV full signal input voltage range number of divisions of resolution e g for 2 5mV V range 10V excitation full signal input voltage is 2 5mV x 10V excitation 2omv For 14 5 bits 100 samples sec zero filter the number of divisions is 2 which equals 23170 divisions For 21 5 bits 5 to 30 samples se
23. nge is greater than the percentage selected in the ZEI OF SE function then any attempt to zero the display will be aborted and a rear r V CEDI NSE Err message will be seen the beeper will also sound repeatedly If the zero operation is successful then the instrument will beep once and the err Limessage will be seen prior to the display value going to zero A zero range setting of 0 0 will mean that no zero operation is possible a zero range setting of 100 0 will mean that the display can be zeroed at any time no matter what the display value at the time Example A load cell is calibrated using 2 point calibration the SL figure is 10 and the SLL figure is 70 If the Ce UF ri 3E function is set to 30 0 30 0 percent then the display can only be zeroed if the display is below approximately 18 This is calculated by 5E Z SLL tx 30 i e 70 10 x 0 3 18 CF 112 10 Version 3 1 0 Note that the zero operation is cumulative i e the zero operations are added in memory For example if the display is scaled to read from 0 to 1000 and the zero range is set at 20 0 then the DFI 200 will allow multiple zero operations up until a total 200 20 of 1000 200 units have been zeroed off So for example if the DFI 200 will allow a zero with a reading of 50 a second zero with a display reading of 100 but a third zero with a display reading of 70 will not be allowed since 50 100 70 220 which is over the limit of 200 set by the 20 0 ze
24. now indicate LALE 2nd calibration point followed by a live reading 11 Apply an input of 100 again this value is not critical but there must be at least 10 of rated capacity difference between L ME fandL ALE inputs For best accuracy the difference between LAL fand LAL Z inputs should be as large as possible 12 When the reading has stabilized press the F button the display will now read Siie scale 2 followed by the second scale value in memory 13 Use the D or v button to obtain the required scale value 14 Press the F button the display will now read AL End indicating that calibration of the second point is complete The display will now move to the next function Two Point calibration graphs Display value Display value CALZ CRL Input Input Setting CAL i Setting C AL Z 4 10 Second point for live input calibration Display E AL Range Any display value Default Value n a Used to set the second live input calibration point seeL AL f CF 112 8 Version 3 1 0 Example 2 point calibration No Load Weighing platform Perform CAL fand SCL i operation with no load or low load Perform CAL g and SCLe operation with load The load must be significantly different to the CAL load at least 10 of capacity difference Weighing platform 4 11 Alternative mV V calibration method Display EL AL Range 9899 or 9 999 irri ri Default Value tf ia ty This
25. operation then you will find that either the ZE ur S amp value needs to be changed ora LAL ZEF D operation carried out e Roc FAI ii Err This message indicates that the ELAL value selected is higher than the 9E setting Check the settings and adjust either the EQAL or F NSE setting as required e SPASM Err This message indicates that the change in load between EAL f and CAL 2 was not enough The change must be a minimum of 10 of rated capacity of the load cell pressure sensor to allow calibration e Lo BREE This message indicates a low battery voltage Fit a new battery The P OFF function can be used to automatically switch the instrument off after a selected time of no operation to extend the life of the panel y e POFFO This message indicates that the instrument is about to automatically power down see PORE function e Ruto Err This message indicates that a memory chip has been detected but that an error has occurred usually due to a unit address not being assigned to the chip Check that the memory chip has been assigned an address see Unit function for procedure It may be necessary to manually change the t Hri function to LH A tto be able to view and change the Unit function 5 EXTERNAL MEMORY An external memory option is available for the DFI 200 The purpose of the external memory is to allow calibration scaling details for a particular load cell to be stored the external memory is then permanen
26. ro range selection The best solution to allow zeroing beyond this is to set a new calibration zero reference point via the L ALE O function alternatively the CE F GF MG Esetting can be increased 4 14 Set zero reference point Display L AL CEF D Range n a Default Value n a This function allows the operator to clear the JEF ui ra 9E limit memory and select a zero reference point anywhere within the input range The amp i amp function is provided to allow a zero reference for the tf 4S function only and does not form part of the calibration scaling i e a L AL EF L operation does not cause the display value to go to zero The JEF Lr 43 function sets the limit for pushbutton zero operations If this limit is exceeded no further zero operations can be undertaken unless the JEF UF F 9E value is increased or ifthe L AL amp EF D function is used to clear the CEs ts tS range memory and set a new zero point To clear the memory and set a new zero reference point press the and v buttons simultaneously to execute this function a live reading will be seen Press the F button to enter this as the new zero reference The message TE ts Ere will be seen to confirm that the operation has been completed Thee GF IGE memory will now be cleared but the display reading will not change 4 15 Display zero Display SE amp eeetli D Range n a Default Value n a Used to set the load cell system to display reading of zero T
27. s the ASCII character for address 1 33 Dec of 21 Hex M is the ASCII character for CR CF 112 17 Version 3 1 0 A typical format for the host command is lt STX gt CA lt CR gt Standard read Where lt STX gt is Start of Text Character 2 Dec 02 Hex B ASCII C is the command character see following commands A is the unit address Range 32 to 63 Dec 20 to 3F Hex SPACE to ASCII the address is offset by 32 Dec 20 Hex lt CR gt is Carriage Return 13 Dec OD Hex M ASCII The P amp L L commands available and instrument responses are as follows 1 Transmit Primary Display Value lt STX gt PA lt CR gt e g BP M in the terminal program address 1 Instructs unit to return the primary display value The primary value is the main display reading e g load or pressure Format of returned data is lt ACK gt PAXYYYY lt CR gt Where lt ACK gt is Acknowledge 6 Dec 06 Hex P is the echo command received P 80 Dec 50 Hex A is the responding units address X is SPACE for positive and for negative YYYY is the display value in ASCII lt CR gt is a Carriage Return 13 Dec OD Hex The number of display characters returned depends on the number of display digits present If the decimal point is non zero then it will be sent in the appropriate place as 46 Dec 2E Hex 2 Transmit Secondary Display Value lt STX gt SA lt CR gt e g BS 4M in the terminal program address 1 In
28. s used to transmit data to a compatible display e L amE Sends ASCII form of display data every time display is updated POLL Controlled by computer or PLC as host Host sends command via RS232 and the instrument responds as requested in ASCII form See Poll commands section which follows e A B S This is a special communications mode used with Windows compatible optional PC download software Refer to the user manual supplied with this optional software Addr set unit address for polled PE L mode 0 to 31 Allows an individual address to be assigned to a number of DFI 200 instruments The instrument will respond with its address proceeding the display reading The unit address ranges from 0 to 31 DEC but is offset by 32 DEC to avoid clashing with ASCII special function characters Such as lt STX gt and lt CR gt Therefore 32 DEC or 20 HEX or SPACE ASCII is address 0 whilst 42 DEC or 2A HEX or _ ASCII is address 10 If the host computer or PLC etc uses address 0 when polling then the DFI 200 connected to the host will always respond no matter what the Ader function setting If the host uses any other address then only instruments with the same address will respond to a polling command Cont commands Continuous Output Mode The standard format for Cont mode is as follows lt STRDAYYYY lt CR gt Where lt STR gt is the ASCII Start of text character 2 Dec 02 Hex X is an ASCII Space character 32 D
29. sed for 2 3 seconds the peak value in memory will be reset and a the current value will be become the new peak value The display will automatically return to normal measurement after 20 seconds Alternatively if the User button is held pressed down the peak reading will be held whilst the button is held pressed down and will only return to normal measurement 20 seconds after the button is released e HFT Change calibration channel Allows toggling between input readings for calibration channels H A if memory chip is used CH1 Heand 3 If switched off then the instrument automatically reverts to CH1 or L A if memory chip is used when switched on again Pera nE Output serial string to printer etc The RS232 serial communications must be enabled to use this function With the HS ES function set to and the B P uE function set to POL Leach time the User button is pressed the display value will be sent from the RS232 serial port in 8 bit ASCH format 4 9 First point for live input calibration Display LAL Range Any display value Default Value n a Two point calibration scaling this is an alternative calibration method to the CELAL method of scaling note that only one method needs to be used See Use of EL Aland E 2L Las reference values if using LAL fand LAL Z The LAL fandt AL 2 functions are used to set two independent calibration scaling points of the input to the display This method uses two different liv
30. structs the unit to send the secondary display value The value will equal the primary display value if the SEF function is set to NONE If the USE f function is setto ERTE gd Hid P 4i dor CHAL the value for the selected Paon will be returned Format of returned data is lt ACK gt SAYYYY lt CR gt or lt ACK gt SAYYYY YYYY lt CR gt in the case of Lo Where lt ACK gt is Acknowledge 6 Dec 06 Hex S echo command received S 83 Dec 53 Hex A is the responding units address YYYY is the secondary display value in ASCII lt CR gt is a Carriage Return 13 Dec OD Hex For GE the primary and secondary display values will be identical If amp RF Eis used then the primary display value transmitted will be the live input value i e the gross value The secondary display value transmitted will be the tared value i e the nett value For S t d and F E d the secondary display will be the held value and the primary display the live input value For HFTL the secondary display returned data will be the channel number i e 1 20r3 3 Transmit Instrument Model and Version lt STX gt IA lt CR gt e g BI 4M in the terminal program address 1 Instructs unit to return the model and version number of the instrument Format of returned data is lt ACK gt IACCX X lt CR gt Where lt ACK gt is Acknowledge 6 Dec 06 Hex is echo command received I 73 Dec 49 Hex A is the responding units address CC is a 2 character
31. tically power down and must be switched off via the On Off pushbutton 4 18 Baud rate for optional serial communications Display BAL FREE Range FUD BUD Peo eo Boo SBG 19 2 or 30 9 Default Value GU Select from 300 600 1200 2400 4800 9600 19 2 or 38 4 baud This must be set to match the baud rate selected at the sending device Refer to chapter 6 for further details 4 19 Parity for serial input Display Pr ES Range iui cue OF ued Default Value thie Select parity check to either MONE ELEM or Udd This must be set to match the parity selected at the sending device Refer to chapter 6 for further details 4 20 Output mode for serial communications Display U P uk Range di SP Cont POLL or A buS Default Value L amet Allows user to select the serial interface operation as follows e o SF sends image data from the display without conversion to ASCII e Lore sends ASCII form of display data at a rate typically 90 of the sample rate e POLL controlled by computer or PLC as host Host sends command via RS232 485 and instrument responds as requested Abu This is a special communications mode used with Windows compatible optional PC download software Refer to the user manual supplied with this optional software Refer to chapter 6 for further details 4 21 Instrument address for optional serial communications Display A odad Range amp to J Default Value Set unit address for polled DL t mode 0 to
32. tly connected to the load cell The external memory allows the DFI 200 to be used with many load cells each attached to individual memory chips without the need to recalibrate every time the load cell is connected i e each load cell requires only one calibration When the external memory is connected to the DFI 200 the calibration scaling data is used by the DFI 200 to display the required scale values for that load cell The external memory will normally be housed inside the 9 pin D connector shell connected to the load cell although memory chips can also be used with switch boxes to allow ease of switching between load cells CF 112 13 Version 3 1 0 Memory chip housed in connector shell Note each external memory device should be allocated a unit address see tim E function Valid addresses are 1 to 250 If the Unit function indicates an address of 255 then this indicates that the memory device has not been given an address The same address can be allocated to more than one memory device and the address of a device can be changed at any time The setting of individual unit addresses simply allows identification of the load cell by viewing the Unit function If the error message Aisi a Err is seenon attaching the external memory this error message means that the DFI 200 has recognized that an external memory is connected but cannot read from it Usually the cause is that the address of the chip is 255 To overcome this follow the proce
33. w In CAL or FUNC modes pressing the User button will cause the instrument to immediately return to normal CF 112 6 Version 3 1 0 measurement mode Any changes to the function selected when the button was pressed will not be saved This function may be set to any one of the following e ME Button has no special function o ERIE Push button tare the pushbutton must be pressed for 2 3 seconds to perform a tare operation When tare is selected you can toggle between the nett tare and gross displays via the User pushbutton The message I pS EE Eor ER Ewill precede the measurement value ce aAiad Display hold Press the User button momentarily to hold the display the message alti d will flash every few seconds Press the F button to reset back to normal display If the User button is held pressed for 2 3 seconds the held value in memory will be reset and the current value will be held The display will automatically reset to normal measurement after 20 seconds Holding the User button pressed in will cause the held value to be reset and the value on the display after the reset will be held for as long as the button is pressed down The held display will only return to normal measurement 20 seconds after the button is released c Pid Peak hold Press the User button momentarily to hold the peak value display the message PHL d will flash every few seconds Press the F button to reset back to normal display If the User button is held pres
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