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Appendix B: Master-Slave Protocol

VT400 Technical Manual, Rev. A5

Doc

UM-VT400-EN

Master
Transmission

ID SLAVE

NYYYYY

BCS

N: Setpoint number 1-2 (ASCII)

YYYYY: Setpoint value (ASCII, MSB first)

Slave Response

ECHO

4 Command: Upload Setpoint Values

This command uploads setpoint values from the slave to the master.

Master
Transmission

ID SLAVE

NXXXXX

BCS

N: Setpoint number 1-2 (ASCII)

XXXXX: These bytes are not used; fill with Space character (20h).

Slave Response

ID SLAVE

NYYYYY

BCS

N: Setpoint number 1-2 (ASCII)

YYYY: Setpoint value (ASCII, MSB first)

5 Command: Read Setpoint Values

This command uploads status for the setpoint outputs.

Master
Transmission

ID SLAVE

XXXXXX

BCS

XXXXXX: These bytes are not used; fill with Space character (20h).

Slave Response

ID SLAVE

12----

BCS

1,2: Status of setpoints 1 and 2: 0 if setpoint is off, 1 if setpoint is
on)

----: Space characters (20h)

Summary of Contents for VT400

Page 1: ...VT400 Weight Indicator Technical Manual Revision A5 June 2009 Doc UM VT400 EN ...

Page 2: ...IONS 14 1 1 GENERAL 14 1 2 ANALOG INPUT 15 1 3 ANALOG OUTPUT OPTIONAL 15 1 4 DIGITAL INPUT 16 1 5 DIGITAL OUTPUTS 16 2 INSTALLATION 17 2 1 SITE REQUIREMENTS 17 2 2 MOUNTING THE INDICATOR 17 2 2 1 Installation 17 2 2 2 Wiring 18 2 3 CONNECTING LOAD CELLS 18 2 3 1 Load Cell Operating Parameters 19 2 4 SERIAL CONNECTIONS 19 2 4 1 Printer and PC Cables 19 2 4 2 RS485 Cable Connections 20 2 5 CONNECTIN...

Page 3: ...P 1 General Operating Parameters 28 SETUP SETUP 2 Com 1 Settings 29 SETUP SETUP 3 Com 2 Settings 30 SETUP SETUP 4 Tilt Switch 30 SETUP SETUP 5 Setpoints 31 A CAL Analog Output 31 A CAL Analog Output cont 32 4 CALIBRATION 33 4 1 CALIBRATION WITH STANDARD WEIGHTS S CAL 33 4 1 1 Zero Dead Load Calibration 33 4 1 2 Span Calibration 34 4 2 ELECTRONIC CALIBRATION E CAL 34 4 2 1 Calculating Calibration V...

Page 4: ... 43 6 2 SETTING PORT OUTPUT PARAMETERS 44 6 2 1 Setting Port 1 Output 44 6 2 2 Setting Port 2 Output 44 6 3 OUTPUT TYPES 44 6 3 1 Local Printer 44 6 3 2 Continuous Weight Output 44 6 3 3 Print on Demand 45 6 3 4 Alibi Transmit 45 6 3 5 Alibi Mode Commands 45 Transmit Displayed Weight 45 Command ZERO 46 Print on Demand Character 46 6 3 6 EDP Protocol Output 46 6 3 7 Remote Printer Output 47 6 3 8 M...

Page 5: ...ad Cell mV Function 80 57 8 1 4 Viewing A D Count Function 81 57 8 1 5 View Software Version Number and Date Function 82 57 8 1 6 Locking and Unlocking Keys 57 8 2 TESTING THE INDICATOR 58 8 2 1 Testing ROM RAM Integrity Function 86 58 8 2 2 Testing the Keypad and Display Function 90 91 58 8 2 3 Testing Digital Input and Outputs Function 93 59 8 2 4 Testing the Print Buffer Function 94 59 8 2 5 Te...

Page 6: ...FIGURE 3 PRINTER AND PC CABLES CONNECTION DIAGRAM 19 FIGURE 4 RS485 CABLE CONNECTION DIAGRAM 20 FIGURE 5 NON REMOVABLE STICKER 37 FIGURE 6 LEAD WIRE SEAL HARD PLASTIC STICKER 37 FIGURE 7 DESKTOP MODEL SEALING WITH NON REMOVABLE STICKER 38 FIGURE 8 DESKTOP MODEL SEALING WITH LEAD SEAL NON REMOVABLE STICKER 39 FIGURE 9 DIGITAL OUTPUT AND TILT SWITCH CONNECTION DIAGRAM 50 ...

Page 7: ...emark is granted hereunder and you agree that no such right license or interest shall be asserted by you with respect to such trademark You shall not copy reverse compile or reverse assemble all or any portion of the Manual or the Product You are prohibited from and shall not directly or indirectly develop market distribute license or sell any product that supports substantially similar functional...

Page 8: ...rom personal injury Some states do not allow the exclusion or limitation of incidental or consequential damages for consumer products so the above limitations or exclusions may not apply to you The Purchaser agrees that the Purchaser is responsible for notifying any subsequent Buyer of goods manufactured by Vishay Transducers of the warranty provisions limitations exclusions and disclaimers stated...

Page 9: ...devices remove jewelry or any other metallic object that may come into contact with energized parts The product is intended to be grounded during normal use Grounding is provided by connecting the mains plug to a wall socket with a protective earth terminal The earth lug provided on the product should be connected to the protective earth at all times by a wire with a diameter of 18 AWG or wider Al...

Page 10: ...mergency make sure that a readily accessible circuit breaker or emergency switch is installed in the building Operating Environment Ambient Temperature Storage temperature 10ºC to 70ºC 14ºF to 158ºF Operating temperature 10ºC to 40ºC 14ºF to 104ºF Humidity 40 to 90 RH non condensing Vibration Severe vibration can affect the accuracy of weighing and damage components Air The air surrounding the pro...

Page 11: ...o the requirements of the Council Directive 90 384 EEC as amended and to the requirements of the following EC Directives EN 45501 1994 The Metrological Aspects of Non Automatic Weighing Machines EN 55022 1987 Limits and Methods of Measurement of Radio Interference Characteristics of Information Technology Equipment EN 60950 1992 Safety of Information Technology Equipment Date April 30 2004 Signatu...

Page 12: ... and Menus Using the VT400 display keypad function menu and setup menus Pg 21 4 Calibration Performing standard weight calibration and electronic calibration Pg 33 5 General System Parameters General parameters in the SETUP 1 and PAR menus Pg 40 6 Serial Communication Setting up communication with printers host PCs and other external devices Pg 43 7 Outputs and Digital Input Connecting and using t...

Page 13: ...menus commands and parameters Monospace Text displayed on the LCD text a user must key in or values of parameters Notes which offer an additional explanation or a hint on how to overcome a common problem Warnings which indicate potential safety hazards regarding product operation or maintenance to operator or service personnel ...

Page 14: ...ard 6 key membrane type with tactile feedback Approvals EU type approval 10 000 divisions 0199 62 Accuracy class III Resolution Selectable up to 99 000dd in accordance with regulations Max tare effect Full scale 100 Auto zero track Off or 0 5dd setup selectable Weight digits 4 5 or 6 Weight steps 1 2 5 10 20 50 100 200 Digital filter FIR automatically adjusted to conversion speed plus post filteri...

Page 15: ...ion speed 3 7 14 28 57 70Hz selectable Linearity Within 0 002 of full scale Span temp coefficient 2ppm C Zero temp coefficient 2ppm C Long term stability 0 005 of full scale per year 1 3 Analog Output Optional Power supply External 24VDC Main instrument PSU can be used Current or voltage Selected via jumper JP1 on printed circuit board 761 see section 7 4 Current output 0 20mA or 4 20mA Max load r...

Page 16: ...ositive common optoisolated to 2 5KV Input resistance 3 3KΩ On delay 2msec max Off delay 2msec max 1 5 Digital Outputs Output voltage 24 VDC 10 transistor source darlington positive common Max current 100mA leakage current 100µA Max off state voltage 30VDC On delay 2msec max Off delay 2msec Both outputs are optoisolated to 2 5KV ...

Page 17: ...rect sunlight on the front of the instrument The unit should be placed at the correct height to allow easy reading of the display and convenient keyboard operation 2 2 Mounting the Indicator 2 2 1 Installation The indicator is panel mounted The cut out dimensions for panel installation are 136 5mm x 66 5mm The front and rear views of the unit are shown in Figure 1 Figure 1 Front and rear views of ...

Page 18: ... where indicated in the drawing Never use a Megger to check wiring Never use plastic insulating tape on load cell connections 2 3 Connecting Load Cells Use 6 x 0 5mm2 shielded cable for load cell connections Maximum length 300m Connect the load cells according to the diagram below Figure 2 Load cell connection diagram 1 2 3 4 5 6 7 I1 CI O1 O2 Co COM 2 COM 1 Analog Output Load Cell 1 DB9 fem DB9 m...

Page 19: ...controller is at least 0 4µV per scale increment For load cell output less than 0 4µV digit the controller will still be stable but the full temperature range accuracy is not guaranteed 2 4 Serial Connections For RS232C connection use 3 x 0 34mm2 shielded cable For RS485 connection use 2 x 0 34mm2 shielded twisted pair cable 2 4 1 Printer and PC Cables Figure 3 Printer and PC cables connection dia...

Page 20: ...5 cable connection diagram 2 5 Connecting Power VT400 indicators are powered from an external power supply 24VDC or battery Power should be isolated from other data processing equipment Verify that the AC power socket outlet is properly protected For optimum EMC performance keep the length of cable shielding inside the enclosure as short as possible Network Biasing Resistors Chassis Earth 470R 150...

Page 21: ... and the names of menus and functions Six keys used to perform the most common functions and access a function menu with more advanced options The lower area shows information about the maker model and certified limits of your indicator Five status annunciators are located in the top left part of the panel The red dots provide the current function range and status information such as whether the s...

Page 22: ...essage type Meaning 352 0 Weight of the item on the scale 319 0 active Net weight Over range The item on the scale weighs more than the maximum capacity of the scale or the load cell signal is too high UUUUUU Under range The item on the scale weighs less than the minimum capacity of the scale or the load cell signal is too low Fn 06 Function menu see section 3 3 To perform the function currently s...

Page 23: ...s this key the current weight is printed to the printer and or output to an attached computer and added to the accumulated total Printing outputting to computer Press once to view the sum of all accumulated weights Press again to see the number of weights accumulated Press again to view the current weight Accumulated total This operation cannot be performed if the weight is not stable 3 2 2 Using ...

Page 24: ...u and provides a summary of its functions All operations are explained in more detail further in this document 3 3 1 Using the Function Menu To access a function on the function menu 1 Press FUNCTION on the front panel The display shows Fn 00 The left digit should be flashing 2 Check the number of the function you need refer to section 3 3 2 below If the function you need is between 01 and 09 skip...

Page 25: ...ing when you press PRINT even if a printer is connected Function activated only if setup parameter 2 8 is set to 1 21 Set print output format Ticket Shows weight in the following format GROSS 00 500 kg Function activated only if setup parameter 2 8 is set to 1 Section 6 2 1 22 Set print format Continuous output Used for external display or PC Function activated only if setup parameter 2 8 is set t...

Page 26: ...3 to enable Alibi printing The entire alibi memory will be printed in the format gross weight SN 0001 123 45 Press ZERO to stop printing 57 Checksum test Performs a checksum on each alibi memory ensuring it is not corrupted An alibi memory serial number will be displayed in the format n 0000 If all records are okay PASS is displayed briefly If an error is found Err 57 is displayed This function is...

Page 27: ...g and Navigating Setup Menus To enter the setup and calibration menus either execute function 49 or follow the procedure below To enter the setup and calibration menus 1 Turn on the unit 2 During the self test routine while all display segments are on all 8 on the display press PRINT momentarily followed by TARE momentarily Alternatively press FUNCTION and access function 49 3 If the PIN code is a...

Page 28: ...es CAL S CAL ZEro SPAN Standard weights calibration dialog E CAL ZEro SPAN Electronic calibration dialog STORE Permanently saves calibration data and exits setup INIT Resets scale parameters configuration and calibration data to manufacturer defaults A CAL A 1 A 2 A 3 A 4 A 5 A 6 A 7 A 8 D A analog output parameters 3 4 3 Parameter Summary SETUP SETUP 1 General Operating Parameters Par Description...

Page 29: ...out 2 A Left margin Number of spaces from left margin 2 F Page header Number of linefeeds before printout 2 E Line termination 0 LF 1 CRLF 2 LFCR 2 1 Printer model 0 FANFOLD like Epson FX or similar serial printer 1 SLIP like Epson TM 295 2 2 Reserved for future use 2 3 Print below minimum capacity 0 NO 1 YES 2 4 Reserved for future use 2 5 Reserved for future use 2 6 Wait unload 0 NO 1 YES 2 7 Pr...

Page 30: ... channel 2 17 7 data bits even parity 08 8 data bits no parity 18 8 data bits even parity SETUP SETUP 4 Tilt Switch Par Description Values 4 t Time delay after closing the contact for the display to lock This is also the time for the display to unlock after the contact is opened This parameter has several special values 91 Tare scale on the rising edge of input Setpoints always enabled 92 Print on...

Page 31: ...nd 10V at max 1 opens a dialog after A 8 that allows you to enter custom zero and span values Press PRINT to confirm the display shows 0 XX XXX Enter the D A output at zero in voltage or mA and press PRINT The display shows F XX XXXX Enter the D A output at maximum input in voltage or mA and press PRINT 0 Standard 20mA max 1 User defined Zero and Span A 2 Normal or absolute AOUT mode Specifies wha...

Page 32: ...rent 1 Voltage A 5 Net gross Specifies whether the indicator should always output gross weight or output net weight when tare is active 0 Net weight 1 Gross weight A 6 Effective Range for current output Sets the range to 0 20mA or 4 20mA Relevant only if A 4 and the hardware jumper are set to current 0 0 20mA 1 4 20mA A 7 Resolution Specifies whether output should be in high resolution if the disp...

Page 33: ...tes for warm up 3 Proceed with calibration as described in the following pages 4 Store the calibration data see section 4 3 5 Seal the unit see section 4 4 4 1 Calibration with Standard Weights S CAL Calibration with standard weights is done in two stages Zero calibration in which you take a weight measurement when there is nothing on the scale see section 4 1 1 This is also called dead load adjus...

Page 34: ...and TARE to move to the next digit 5 Press PRINT to confirm the calibration weight 6 The display shows Add Ld Place the calibration weight on the scale and wait about 10 seconds 7 Press PRINT The display counts down for about 10 seconds and then shows the calibration weight 8 If the weight shown is not accurate press ZERO and go back to step 4 4 2 Electronic Calibration E CAL Electronic calibratio...

Page 35: ...880 mV V This is the span calibration value 3 Calculate an average of the load cells zero balance In the example above this equals 0 0257 0 0276 0 0553 0 0022 4 0 0266mV 4 Calculate the scale dead load In the example above this equals 1 9600mV 1 940Kg 4 50Kg 0 0190mV 5 Calculate the overall dead load by adding together the load cell zero balance and the scale dead load calculated in step 2 In the ...

Page 36: ...he setup menus and use TOTAL to scroll to the STORE option 2 Press PRINT The indicator exits the setup menus and re initializes 4 4 Locking and Unlocking Calibration An internal jumper JP1 located on the main printed circuit board next to the analog circuit must be removed to allow access to configuration and calibration parameters One way to seal the indicator is to prevent access to this jumper ...

Page 37: ...s After calibration you can seal the indicator with two stickers A non removable label to prevent unauthorized opening of the indicator enclosure Figure 5 A lead wire seal or hard plastic sticker to prevent unauthorized tampering with the load cell connector Figure 6 Figure 5 Non removable sticker Figure 6 Lead wire seal hard plastic sticker ...

Page 38: ...00 EN To seal the indicator Refer to Figure 7 below for the non removable sticker and to Figure 8 for the lead seal non removable sticker You must apply both stickers Figure 7 Desktop model sealing with non removable sticker Non removable sticker Non removable sticker Non removable sticker ...

Page 39: ...tification label The load receptor bears the serial number of the indicator on its data plate 4 4 3 Checking Seal Status and Audit Trail Counter In order to check whether the jumper is still in the sealed position and that the audit trail counter has not changed To check seal status and audit trail counter Execute function 48 If JP1 is currently in the sealed position the word SEALED appears on th...

Page 40: ...enu 5 1 1 Accessing the Menu and Editing Parameters To access the PAR menu 1 Turn on the unit 2 During the self test routine while all display segments are on all 8 on the display press PRINT momentarily followed by TARE momentarily Alternatively press FUNCTION and access function 49 3 If the PIN code is activated the display shows ACCESS briefly Type the PIN number and then PRINT to get into the ...

Page 41: ...verter errors should remain on the display until the operator presses ESC 0 NO 1 YES 8 5 Reserved for future use 8 6 Leading zero blank 0 NO 1 YES 8 7 Load cell amplifier gain adjustment A D Gain 2mV V setting allows maximum utilization of 1 75mV V 4mV V setting allows maximum utilization of 3 75mV V 0 2mV V 1 75mV V utilization 1 4mV V 3 75mV V utilization 8 8 AC DC excitation AC sets load cell e...

Page 42: ...SETUP 4 Press PRINT to enter the SETUP 1 menu To edit parameters in the SETUP 1 menu 1 The current parameter number is shown on the display Use PRINT to scroll to the parameter you need see the following section for descriptions of parameters 2 To edit the parameter value use P TARE to increment the current digit and TARE to move to the next digit 3 When the display is showing the required value p...

Page 43: ...RS232C standard full duplex Protocol 2400 baud 1 start 7 data even parity or 8 data no parity 1 stop bit Handshake DTR BUSY per character for fanfold printers or REQUEST PAPER END STATUS for EPSON TM 295 slip printer Connection DB9 male on rear panel J1 or J3 Three conductor shielded cable max distance 15m Tx Pin 3 Rx DTR Pin 2 GND Pin 5 6 1 2 RS485 Serial Port Used to connect to a host computer r...

Page 44: ...pts the following values 00 port disabled 01 continuous weight output See section 6 3 2 02 EDP protocol output See section 6 3 6 03 printing data from local printer on remote printer See section 6 3 7 65 through 90 A Z address participate in a network of several indicators as slave with this address See section 6 3 8 6 3 Output Types 6 3 1 Local Printer Works with port 1 A slip is printed on the p...

Page 45: ...n 0D hex for end of transmission 6 3 3 Print on Demand Works With Port 1 RS232 Weight data is transmitted every time a character is received from a connected peripheral The demand character is programmed using setup parameter 2 C e g 1 49d or 31 hex 6 3 4 Alibi Transmit Works With Port 1 RS232 Transmits alibi serial number and gross weight for each transaction when the PRINT key is pressed The rec...

Page 46: ...and character is received the unit saves the weight in its Alibi flash It then transmits the Alibi number and the weight for example 1234 012 340 kg The demand character may be programmed through SETUP SETUP 2 setting 2 c 65 90 A Z A 41h will generate and transmit the new Alibi number a 61h will repeat the last Alibi number in the case where the message was not received properly 6 3 6 EDP Protocol...

Page 47: ...peats is unlimited Relevant Setup Parameters 3 1 timeout control 0 No 1 Yes Turning off timeout removes the 5 second constraint in workflow steps 2 and 4 Errors 30 or 33 are never shown 3 2 handshake 0 No 1 Yes Turning off handshake removes steps 4 and 5 of the protocol workflow the indicator sends data blocks on demand without waiting for a response 3 3 operator disable 0 No 1 Yes If this option ...

Page 48: ...Port 2 RS232 or RS485 By setting port 2 output method parameter 3 t to any number between 65 and 90 A Z you specify that the indicator should participate in a network of several indicators The number set in 3 t is this indicator s network address For more details on the master slave protocol supported by the VT400 see Appendix B ...

Page 49: ...e section 7 4 The digital input is used as a tilt switch When a signal is received on the input cable the display locks for a certain period of time 7 1 Specifications 7 1 1 Digital Outputs Transistor output open collector positive common 24VDC 10 100mA per output Max off State voltage 30VDC leakage 100µA Optoisolated to 2 5KV Short circuit protected 2ms maximum delay for both on and off positions...

Page 50: ...ove the threshold for setpoint 2 it can be rejected Setpoints can be activated either by net weight value or by gross weight depending on how it was defined in setup In GROSS the setpoint will be activated when the gross weight reaches the target value either by weight accumulation or by weight loss in case that the starting load was above the setpoint In NET mode the setpoint will be activated ei...

Page 51: ...T 6 The display now shows SEtP 2 briefly then the current threshold for setpoint 2 The extreme left digit flashes If you don t want to change this threshold press PRINT and skip to step 8 If you do want to change it proceed to the next step 7 Enter a new threshold value To do this press u P TARE to change the current digit then t TARE to move to the next digit When you are done press PRINT 8 The t...

Page 52: ...hich of the two output methods to use After connecting the board and setting the jumper you can set analog output parameters using the SETUP A CAL menu see section 7 4 2 7 4 1 Connecting PCB and Setting Jumper In order to use analog output the option PCB PCB 761 must be connected to the VT400 as follows To ST5 socket in the one side and to the rear panel in the other side using the mounting posts ...

Page 53: ...nalog output parameters detailed in the table below Par Description Values A 1 Standard custom zero and span 0 specifies that the scale should output 0mA at zero input and 20mA at maximum input or 0V at zero and 10V at max 1 opens a dialog after A 8 that allows you to enter custom zero and span values Press PRINT to confirm the display shows 0 XX XXX Enter the D A output at zero in voltage or mA a...

Page 54: ...see section 7 4 1 The default setting is voltage 1 0 Current 1 Voltage A 5 Net gross Specifies whether the indicator should always output gross weight or output net weight when tare is active 0 Net weight 1 Gross weight A 6 Effective range for current output Sets the range to 0 20mA or 4 20mA Relevant only if A 4 and the hardware jumper are set to current 0 0 20mA 1 4 20mA A 7 Resolution Specifies...

Page 55: ...same time delay elapses Set 4 t to 00 to disable the tilt switch function 7 5 1 Tilt Switch Options Parameter 4 t which controls the tilt switched allows several special options accessed by setting it above 90 91 Tare scale on the rising edge of input Setpoints always enabled 92 Print on the rising edge of the input Setpoints always enabled 93 Setpoints active when input is high Setpoints inactive...

Page 56: ...N and press PRINT If the PIN you entered is correct the display shows PIN 1 If you entered a wrong PIN the unit resets Turn it on and go back to step 1 3 Enter the new PIN number and press PRINT The display shows PIN 2 4 Re enter the new PIN number and press ENTER The new PIN is stored and the display shows PASS briefly If the two entries are not the same FAIL is displayed briefly and the new PIN ...

Page 57: ... transmitted by the load cell 8 1 4 Viewing A D Count Function 81 To view the A D count Access the function menu and select function 81 The indicator shows the internal count of the analog to digital converter Press ESC to exit 8 1 5 View Software Version Number and Date Function 82 To view the number and date of the current software version Access the function menu and select function 82 The indi...

Page 58: ...n 86 2 One of the following messages are displayed Err 01 indicates that ROM data is corrupted Err 02 indicates that RAM data is corrupted PASS indicates that both ROM and RAM memory is okay 8 2 2 Testing the Keypad and Display Function 90 91 To test that the display is working properly Access the function menu and select function 90 All digits display 0 through 9 in sequence and then all characte...

Page 59: ...s on the data sent should be displayed in the sixth digit If the output connects to another device check if the signal was received 5 Connect a device to the digital input and send a signal See if the data appears in the first digit 8 2 4 Testing the Print Buffer Function 94 To test the print buffer Access the function menu and select function 94 An ASCII file 30h 7Fh is output to the printer port...

Page 60: ...Err 02 Faulty CMOS RAM Contact manufacturer Err 04 Calibration data corrupted due to faulty EEPROM Contact manufacturer Err 05 The scale is not connected properly or the analog to digital converter is faulty Check the scale cable and connectors If these are okay contact manufacturer Err 06 Insufficient power Check the indicator s power supply Err 07 Data memory is corrupted either because of extre...

Page 61: ...but you would like to continue using the indicator anyway press ZERO Err 55 Alibi memory is full The memory serial number resets to 0000 From now on each new memory entry overwrites the oldest record in alibi memory Press ZERO Err 56 Printing error Tare is currently active but selected print format does not support net weight Printout aborted Printing stops and returns to weighing mode Err 57 The ...

Page 62: ...uts as follows The first digit from the left displays data received on the digital input channel The fifth digit from the left displays data sent on output 1 The sixth digit from the left displays data on output 2 3 Press PRINT to toggle output 1 on and off When it is on the data sent should be displayed in the fifth digit If the output connects to another device check if the signal was received 4...

Page 63: ...rsion BAT TEST 5V JP1 Calibration lock 2 Outputs 1 Input Tilt Isolated ST3 ST1 ST5 5V Power Supply Power Input Filter Power On Off PCB 801 PCB 761 PCB 715 PCB 439 Sel Current or Voltage Output JP1 5V ST1 ST7 J2 ST9 J4 ST9 J4 Option Analog to Digital Conv 0 10VDC or 0 20mADC Analog Output Max 10 X 350Ω Load Cells ST1 RS485 Driver JP1 TER RES J3 ST2 RS 485 ST2 6 Key PWRNF Membrane Keyb 6 Digits LED ...

Page 64: ...put 2 7 Output Common COM 2 Pin Description 6 A 7 B 8 9 Termination resistor 120R D Type Metal Case Shield LOAD CELL1 Pin Description 1 Excitation 2 Sense 3 Sense 4 Excitation 5 Signal 6 Signal D Type Metal Case Shield 7 8 Calibration Enable COM 2 COM 1 Analog Output Load Cell 1 DB9 fem DB9 male DB15 fem male DB15 fem ANALOG OUTPUT Pin Description 1 9 IOut 2 10 VOut 3 11 IOut or VOut 4 12 Power in...

Page 65: ...odel POWER JP1 Cal Lock INPUT OUT1 OUT2 COM TX RX SGND SHIELD SIG SIG EX SEN SEN EX PCB 801 PCB 715 PCB 761 PCB 439 A B A B SGND JP1 TER SEL IOUT VOUT VOUT or IOUT POWER IN 24 VDC SHLD Select Current or Voltage Output NOTE PCBs are drawn as viewed in the housing 7 6 5 4 3 2 1 3 2 1 7 6 5 4 3 2 1 5 4 3 2 1 6 5 4 3 2 1 ...

Page 66: ...ector 3 4 7 5 6 I1 CI CO O2 O1 Input 1 Tilt Switch Output 1 Output 2 Fuse Digital Outputs Imax 100m L O A D L O A D Power Supply 9 24VDC Power Supply 24VDC DIGITAL OUTPUTS TILT CONNECTIONS To VTx00 RS232 Connector To VTx00 RS232 Connector Printer DB25 Male DB25 Female PRINTER PC CABLES DB9 Metal Case 3 5 2 3 5 2 DB9 fem DB9 Metal Case DB9 fem Shield TX GRN GND BRN DTR WHI Shield TX GRN GND BRN DTR...

Page 67: ...Slave Commands enable remote monitoring and or operation of the weighing terminals by the host processor The Master always controls the communication link although the Master itself may at the same time be a slave to a higher level network The master polls the slave machines and they respond within a specific time period The protocol is designed as a low cost long distance communication link to su...

Page 68: ... for information and the slave responds by transmitting the data requested by the master Master Transmission A communication session is started when the master processor transmits a command to a slave In most cases the slave does not respond immediately The master scans for status with a Status command If the slave is ready to respond then depending on the initial command the slave responds either...

Page 69: ...haracter duration to allow for the slave s transmit buffers to be cleared The master can initialize the slave s receiver buffers by transmitting a 7Fh Communication Modes Two modes of communication can be used for 20mA current loop full duplex and half duplex For RS485 only half duplex mode can be used v Master Slave Commands Following is a summary of the commands available in the master slave pro...

Page 70: ...able below Weight Digits 6 bytes ASCII including decimal point Most significant byte first Example For sending the 3F hex command for RS485 Address 66 66 decimal B ascii 42 hex the message is B BCS BCS is calculated as 42 XOR 3F 7D 1111101 the 6 LSB of the 7D are 111101 add 00 to the 2 MSB and it becomes 00111101 3D hex The message to send from the PC will be B Weight Status Byte B7 B6 B5 B4 B3 B2...

Page 71: ...Command Keyboard Emulation This command performs the operation corresponding to pressing one of a set of keys on the keypad SETUP3 parameter 3 5 must be set to 1 Keyboard Commands enabled before this command can be used Master Transmission ID SLAVE 2 0CXXXX BCS 0 ASCII 30h C the opcode of the key 1 31h 0 key 2 32h Tare key 3 33h P Tare key 4 34h Print key 5 35h ast total key 6 36h fn key XXXX Thes...

Page 72: ...n ID SLAVE 4 NXXXXX BCS N Setpoint number 1 2 ASCII XXXXX These bytes are not used fill with Space character 20h Slave Response ID SLAVE 4 NYYYYY BCS N Setpoint number 1 2 ASCII YYYY Setpoint value ASCII MSB first 5 Command Read Setpoint Values This command uploads status for the setpoint outputs Master Transmission ID SLAVE 5 XXXXXX BCS XXXXXX These bytes are not used fill with Space character 20...

Page 73: ...int Outputs This command is typically used after a Force Setpoint Output command see above and it used to activate setpoints using the current settings in the slave memory Master Transmission ID SLAVE 7 XXXXXX BCS XXXXXX These bytes are not used fill with Space character 20h Slave Response ECHO 8 Command Upload Error Code This command uploads an error code when an error associated with status byte...

Page 74: ... machine The following is the format of most setup commands ID SLAVE COMMAND W1 2 bytes W2 2 bytes W3 2 bytes BCS Data word W1 W3 format Most significant byte b7 to b4 nibble 0 0 1 1 b7 b6 b5 b4 Least significant byte b3 to b0 nibble 0 0 1 1 b3 b2 b1 b0 Decimal to ASCII hex Conversion Most of the setup commands have a data parameter which is specified in ASCII hex and produces a decimal equivalent...

Page 75: ...scription Slave Response 22 Download Parameters 1 Echo Space 20 Upload Parameters 1 Data 23 Download Parameters 2 Echo 21 Upload Parameters 2 Data 24 Download D A Setup and Zero Echo 2B Upload D A Setup and Zero Data 25 Download D A Full Echo 2C Upload D A Full Data 26 Download Setup 1 2 3 Echo 2D Upload Setup 1 2 3 Data 27 Download Setup 4 5 Echo 2E Upload Setup 4 5 Data 29 Download Serial Port 2...

Page 76: ...meters 1 New settings do not go into effect until a Write to EEPROM command is issued Data Byte Number Parameter to be Set Name Description W1 4 P First two digits of weighing range ASCII hex W2 6 P Conversions per second ASCII hex W3 Bit 8 1 Bit 8 2 Bit 8 3 Bit 8 4 Bit 8 5 Bit 8 6 Bit 8 7 Bit 8 8 b0 b1 b2 b3 b4 b5 b6 b7 ...

Page 77: ...sued Data Byte Number Parameter to be Set Name Description W1 0 P Dual interval ASCII hex 2 P b7 b5 Decimal digits 000 0 001 1 010 2 011 3 100 4 1 P b4 Number of display digits 0 4 digits 1 5 digits W2 3 P b3 b0 Display resolution 0000 1 0001 2 0010 5 0011 10 0100 20 0101 50 0110 100 0111 200 5 P b7 b4 Digital filter 0000 min to 0101 max W3 7 P b3 b0 Number of motion samples 0000 min to 0110 max ...

Page 78: ... b5 b6 b7 W2 Analog output 0 2 most significant digits ASCII hex no decimal point W3 Analog output 0 2 least significant digits ASCII hex no decimal point and Commands Download Upload D A Full 1 New settings do not go into effect until a Write to EEPROM command is issued Data Byte Number Parameter to be Set Name Description W1 2 2L Linefeeds after printout 2 digits ASCII hex W2 Analog output FULL ...

Page 79: ...Word Bit W1 SETUP 1 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 b0 b1 b2 b3 b4 b5 b6 b7 W2 SETUP 2 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 b0 b1 b2 b3 b4 b5 b6 b7 W3 SETUP 3 3 1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 b0 b1 b2 b3 b4 b5 b6 b7 and Commands Download Upload Setup 4 5 Data Byte Number Parameter to be Set Parameter Bit Command Word Bit W1 SETUP 4 4 1 4 2 4 3 4 4 4 5 4 6 4 7 4 8 b0 b1 b2 b3 b4 b5 b6 b7 ...

Page 80: ...tings of baud rate and data bits do not go into effect until a Write to EEPROM command is issued Data Byte Number Parameter to be Set Name Description W1 3 t Slave address ASCII hex W2 2 b Baud rate ASCII hex W3 2 d Data bits ASCII hex Command Write to EEPROM This command records the setup and calibration data sent to the VT400 via the other setup commands in this section and resets the indicator ...

Page 81: ...Manual Rev A5 81 Doc UM VT400 EN Upload of Setup Parameters Message Formats Master Transmission ID SLAVE COMMAND XXXXXX BCS XXXXXX These bytes not used fill with Space character 20h Slave Response ID SLAVE COMMAND W1 2 bytes W2 2 bytes W3 2 bytes BCS ...

Page 82: ...na 15 Fl No 86 Sec 1 Sintai 5th Rd Shijr City Taipei 22102 Taiwan R O C PH 886 2 2696 0168 FAX 886 2 2696 4965 E MAIL vt roc vishaymg com Vishay Transducers China No 5 Binguan Nan Dao Youyi Rd Hexi District Tianjin China Code 300061 PH 86 22 2835 3503 FAX 86 22 2835 7261 E MAIL vt prc vishaymg com Europe Vishay Transducers Germany Tatschenweg 1 74078 Heilbronn Germany PH 49 7131 39099 0 FAX 49 713...

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Vishay VT400, Technical Manual

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