Modbus - Issues with Reading Holding Registers

I am trying to read the holding registers on a RS485 2 wire modbus power monitor (Veris Industries E50C2).I am receiving bytes from the device so there appears to be communication. However, the response string is the exact same string as my command string. For instance, I am sending the hexadecimal string 0103 0000 0005 in order to read the first 5 holding registers, but I am receiving this exact same string back via the read VISA read function. I have attached an image of my VI. I would expect to see the response as "0103 (the device ID and command) followed by the number of bytes to follow and the contents of the holding registers.
The VI is running on a cRIO 9012 with 9111 chassis. I am using the 9871 c-series RS485/RS422 interface module.
Any ideas what the issue may be?
Kind Regards
Adam
Attachments:
Modbus VI.png ‏15 KB

I indeed manage to fix the issue for myself.
I used the same method you are starting right now, i conencted the NI9871 to the rs485 adapter given by the supplier and tried sending and reading my own signals.
After much hassle and some changes to your (and my) initial vi setup as shown in your first post, everything worked out fine:
(see the attached picture)
1. I used the NI modbus VIs, but it worked as well with the normal visa commands and building the modbus command on your own, but way easier with the NI VIs.
2. i added the function to resize the buffer to its maximum size (not sure if thats actually helping with anything, but better be safe then sorry).
3. Change the wire mode for the 9871 to rs485/wire2-auto with a property node.
4. remove the large delay between write and read
5. Last but not least, the one thing that changed the fact that i only received my own echo:
I changed the connection of the Rx+/Tx+ and Rx-/Tx- around, basically connecting the 2wire sensor the other way around the manufacturer said it should be connected to the master device.
(6. Recheck the amount of stop bits, all modbus device i use in my lab are using 2 stop bits, but that could be a coincidence)
Maybe something of that list helps you
Attachments:
Modbustest01.jpg ‏95 KB

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This loop is run 14 times. (N from 201001 to 201014.)
TECHICAL DETAILS
Cube 1 (0CM_SKU = Material, 0CPBAINSABU = SALES key figure, WEEKINSALE = Number of weeks for which Material will be
sold). The Sales Planned data is stored as # for 0CALWEEK.
0CM_SKU/0CALWEEK/0FISCPER/0FISCVARNT/0CPBAINSABU--/WEEKINSALE
SHIRT/000000/2010001/ZP/100EUR--/24
SHIRT/000000/2010002/ZP/200EUR--/00
PANTS/000000/2010001/ZP/300EUR--/35
PANTS/000000/2010002/ZP/200EUR--/00
CUBE 2 ( the profile data is stored here )
ZPROFILE/0CALWEEK/ZDIST
ZH55/201001/10
ZH55/201002/12
ZH55/201003/8
ZH55/201004/11
ZH55/201005/10
..so on.
9:11 PM
Edited by: Dheeraj Gupta on Apr 5, 2010 9:20 PM

My Sample CODE IS BELOW.
DATA CW1 TYPE 0CALWEEK.
DATA CW2 TYPE 0CALWEEK.
DATA PER1 TYPE 0FISCPER.
DATA PER2 TYPE 0FISCPER.
DATA FVAR TYPE 0FISCVARNT.
DATA PROV1 TYPE 0INFOPROV.
DATA PROV2 TYPE 0INFOPROV.
DATA SKU TYPE 0CM_SKU.
DATA DPROF TYPE ZPROFILE.
DATA CUMSALES TYPE F.
DATA TEMP TYPE F.
DATA PRO TYPE F.
DATA COUNT TYPE I.
*I WILL READ THE PROFILE VALUE FROM VARIABLE IN ACTUAL PROGRAM.
HARDCODED FOR TEST PURPOSES.
DPROF = 'ZH55'.
*FISCAL YR VARIANT
FVAR = 'MQ'.
*HARDCODED FOR TEST PURPOSES.
PER1 = 2010001.
PER2 = TMVL(PER1, 1, FVAR).
*CUBE FOR SALES
PROV1 = 'ZCLARK'.
*CUBE FOR PROFILE
PROV2 = 'C_ZCLARK'.
FOREACH SKU.
*SUM UP SALES FOR ONE YEAR
*Operand:{Key figure name, 0CALWEEK, 0CM_SKU, 0FISCPER, 0FISCVARNT, 0INFOPROV, ZPROFILE}
CUMSALES = CUMSALES + {0CPBAINSABU,#,SKU,PER1, FVAR,PROV1,#} + {0CPBAINSABU,#,SKU,PER2, FVAR,PROV1,#}.
*READ NUMBER OF WEEKS OF SALES
COUNT = {ZNWEEK,#,SKU,PER1, FVAR,PROV1,#}.
*HARDCODED FOR TEST PURPOSES.
Starting week of distrbution is first week of the year
CW2 = 201001.
CW1 = 201001.
*HELP NEEDED HERE ***********
*NOT ABLE TO READ THIS PROFILE DATA
DO COUNT TIMES.
   PRO = PRO + {ZPROF,CW2,#,#,#,PROV2,ZPROFILE}.
   CW2 = TMVL(CW2, 1).
ENDDO.
DO COUNT TIMES.
{0CPBAINSABU,CW1,SKU,#, #,PROV1,#} = CUMSALES * {ZPROF,CW1,#,#, #,PROV2,ZPROFILE} / PRO.
CW1 = TMVL(CW1, 1).
ENDDO.
*RESET
CUMSALES = 0.
ENDFOR.

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