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Set-up and Troubleshooting Guide MODBUS Protocol

1. Modbus RTU gt Point alues gt 01 03 00 00 00 OB 04 OD 23 04 43 254 je Holding lt 01 03 16 23 04 43 330 Holdin 00 37 15 91 02 B3 03 E2 00 4 A D 5 2 14 04 00 00 02 3E 00 00 02 amp 00 00 85 17 xchange N Read Coil Status Read Input Status Read Holding Regs Bread Input Regs Force Single Coil BR oon Note The test set is requesting Slave 1 send data starting with point 0 and then send back one 11 point Therefore the unit will respond by sending back the values in point 0 through 10 You can also see the format of the request and of the response in the example above If you can not get a response from the MODBUS card you will need to make a capture file of the communications before you move to step 9 Breakdown of Request 01 Slave Address 03 Function Code Read Registers 00 00 Starting Point Point 0 00 OB Read eleven points Point 0 04 OD Check Sum Breakdown of Response 01 Slave address 03 Function Code 16 Byte Count 00 37 Register Point 0 answer 55 15 91 Register Point 1 answer 5521 02 B3 Register Point 2 answer 691 03 E2 Register Point 3 answer 994 00 42 Register Point 4 answer 66 1A OA Register Point 5 answer 6666 00 00 Register Point 6 answer 0 02 3E Register Point 7 answer 574 00 00 Register Point 8 answer 0 02 68 Register Point 9 answer 614 00 00 Register 10 answer 0 85 17 Check sum If you continue having issues connect Landis Gyr Inc at 800 777 2774 please
2. Please note Four 4 items have been added to list on the right from the master list on the left The first items Delivered KWH will be assigned to RTU point 0 and the numbering will continue down the list ending with Received KWH at point 3 The maximum number of selection is limited at 16 The scaling factor allows you to scale the value being sent back by the RTU If the value was 120 1 volts and you left the scaling factor set at one 1 the results would be a value of 120 would be returned If the scale factor was changed from 1 to 10 the results would be a value of 1201 would be returned by the RTU The following is the port configuration for ModBus The only change that you should make is the slave address amp Port Configuration EXAMPLES of reading registers Example 1 If you wanted to read register 0 from the RTU card you would us the following Slave Address 01 In this example the slave address is 1 Function Code 03 Read input Registers Starting Address MSB 00 Starting Address LSB 00 Start at address 0 of points MSB 00 of points LSB 01 Read one point value Check CRC The above example reads register 0 from remote 1 Example 2 If you wanted to read register 9 from the RTU card you would us the following Slave Address 01 In this example the slave address is 1 Function Code 03 Read input Registers Starting Address MSB 00 Starting Address LSB 09 Start at address 0 of points MSB 00 of points L
3. have a capture file you can send to Landis Gyr help desk
4. Landis Gyr Set up and Troubleshooting Guide MODBUS Protocol Se How to set up and read MOBBUS Before anything can be read from the RTU the meter must be programmed During programming up to 16 of the thousands of displays in the meter can be assigned to the RTU The first item in the list will be at point zero 0 EXAMPLE 1 Default from factory amp Build Display Lists z ioj xj Master Display Choices Port RS232 2 Ga NON TOU DISPLAY TEND OF LIST i a Cancel TOU DISPLAYS __ Help GENERAL FORMAT INFORMATIC B INSTANTANEOUS D SCADA Haris D20 for RS232 1 A AUXILARY INPUTS rink Saco 10f 100 Customer 10f100 Utility 1 of 100 C Test 0of32 Port RS232 1 Oof32 C Port Current Loop Oof 32 Port RS232 2 30f 100 Unique Displays Ports Please Note In example 1 the list on the right is empty The meter will send the items in the list on the right to the RTU starting with point 0 Because there has been no items selected all 16 registers are loaded with zeros EXAMPLE 2 After Programming amp Build Display Lists LE ioj xj Master Display Choices Port RS232 2 DELIVERED KWH Ok Taere ee Scale Factor aman 1of 100 C Customer Display Properties Vof 100 C Utility Top Line Ese EUSO Oren Gof 32 C Port AS23241 Unit of Measure ai Qof32 C Port Current Loop Deci C 40f32 Pon RS232 2 mer ase 7 of 100 Unique Displays i aiti
5. S232 E9 Out RXD connected to RS 232 external RS232 1 E10 A RXD connected to backplane standard RS232 i E10 B RXD connected to RS 232 external RS232 1 Example of jumper settings Application Configured to talk to the meter processor on the SuperBoard Display Card over the backplane i e bus on the Mother Board The host interface is RS 232 with CTS not used Jumpers on Protocol Converter Board For meter serial port E9 In E10 on A For host connection E2 on A E4 on B E5 on A NOTE You can convert from RS232 to RS485 by moving E2 from the jumper from A to B Indicates position NOT USED on standard board Jumpers on SuperBoard Display Card E9 in position 2 3 for operation with Protocol Converter Note If E9 is in position 1 2 RS 232 port 2 is active for other purposes Check the firmware Check the internal wiring Check the external wiring We will be using the LED s on the RTU card for checking the communications aeRO The Protocol Converter Card has six LED s labeled LED1 through LED6 These LED s indicate the status of the host and meter communications and the error status LED 1 On when data is being received from the RTU host Green LED on the left side LED 2 On when data is being transmitted to the RTU host Green LED on the right side LED 3 On when data is being received from the meter Red LED left side LED 4 On when data is being transmitted to the meter Red LED right sid
6. SB 01 Read one point value Check CRC The above example reads register 9 from remote 1 Example 3 If you wanted to read all of the registers from the RTU card you would us the following Slave Address 01 In this example the slave address is 1 Function Code 03 Read input Registers Starting Address MSB 00 Starting Address LSB 00 Start at address 0 of points MSB 00 of points LSB 10 Read 16 points values Check CRC The above example reads all 16 registers from remote 1 Troubleshooting If you are unable to communicate with the RTU card please review the following check list 1 Check the jumpers on the RTU card and the E9 jumper on the display card Jumper Installations Protocol Board Host Serial Ports connection from Protocol Board to host computer Port Jumper Position Function E1 Not Used On Standard Board ae E1 A Common Ground Rare E1 B Isolated Ground RS 232 J2 E2 A RX data RS 485 J2 E2 B RX data ERIE E2 B Isolated R8232 E3 Not Used Ring indicate E4 A RS232 CTS used signal from external source E4 B RS232 CTS not used amp RS485 E5 Don t Care RS232 RS485 E5 A RX data Recommended EENE E5 B RX data Isolated RS232 E6 In RS485 Terminated Not Recommended E6 Out RS485 Un terminated Recommended E7 N A Not customer configurable E8 N A Not customer configurable Meter Serial Port connection from Protocol Board to CPU of meter Jumper Position Function E9 In TXD connected to backplane standard R
7. e LED 5 On when RTU communications to the host are not possible due to an error or due to the protocol converter card booting up This LED turns off when the protocol converter card finishes its boot up process and is ready to communicate to the RTU host Yellow LED on the left side LED 6 Displays error codes by blinking on and off The tens digit of the error code is a long on while the units digit is a short on A solid on scintillating condition indicates a line break has been detected and a recovery effort is underway A very short on condition upon power up reset by command or table reload is normal Yellow LED on the right side 6 Power up the meter and wait for one minute then check the LED s on the RTU card The two yellow LED s should be off The two read LED s should be toggling If LED s the red LED s are not toggling check E9 jumper on the display and make sure the program in the meter are set up for modbus 7 Connect a Modbus test set to the meter Send a request to the RTU and observe the green LED on the left The LED should blink If the green LED on the left does not blink check the wiring The RTU is not seeing the request If the green request LED on the left blinked the green LED on the right should blink and you should get received a response If the green response LED on the right did not blink and you did not get a response check the RTU ID The unit will not respond without
8. et is going to request Slave 1 send data starting with point 0 and then send back one 1 point Therefore the unit will respond by sending back the value in point 0 d The test set sends request 4 amp SE2000 Communication Test Set modbus mon lt Modbus RTU gt Point alues gt 01 03 00 00 OO 01 84 OA gt 23 00 50 988 lt 01 03 02 K 23 00 51 047 00 37 F3 92 read Coil Status Read Input Status Bread Holding Regs Bread Input Regs Brorce Single Coil Preset Single Reg read Exc Status A Diagnostic em ooo 00 00090 Note you can see the format of the request and the response in the line monitor box The value is also displayed in the point box If you do not get a response check the format of the request that is being sent If your format is the same as above the problem is more than likely the MODBUS card If you do not have a test set you can use a line monitor to capture the request You can also download a demo copy of the ASE 2000 test set from the Applied Systems Engineering s web site Breakdown of Request 01 Slave Address 03 Function Code Read Registers 00 00 Starting Point Point 0 00 01 Read one point Point 0 84 OA Check Sum Breakdown of Response 01 Slave address 03 Function Code 02 Byte Count 00 37 Register Point 0 answer 55 F9 92 Check sum e This is a request to bring back all 11 points ASE2000 Communication Test Set modbus mon lt
9. the correct ID also check the baud rate Note The yellow should not come on if they do check the communications set up If the yellow LED s are off the read LED s are toggling and the green LED on the left blinks when you send a request and the ID s and baud rates are correct and you do not get a response and the green LED on the right does not blink The problem is more than likely with the format of the request or the MODBUS card is bad 8 Review set up and format of request a Review the list of items that are to be sent by the MODBUS card amp Build Display Lists E PHASE A K PHASE B K Ej PHASE C K Ej PHASE A AMPS Ej PHASE B AMPS Ej PHASE C AMPS E PRY MAX DEL DEM MW E PRY MAX REC DEM MW Ej P MAX DEL DEM MYA i Ej P MAX REC DEM MYA i MYA E PRY DELIYERED MWH i MYA E PRV RECEIVED MWH v As you can see there are eleven 11 items that are being sent back They start with point 0 and go through point 10 Review the port settings for the RS232 2 port used by MODBUS amp Port Configuration Disabled M c Review the se up for an ASE 2000 test set 4SE2000 Communication Test Set modbus mon lt Modbus RTU gt Exchange List Read Coil Status Read Input Status te olding Regs B Force Single Coil preset Single Reg ae Read Exc Status A Diagnostic RE CO No Rep CMM ror CC sec CMI 7 Note The test s

Set-up and Troubleshooting Guide MODBUS Protocol

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