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Old June 4th, 2014, 11:30 AM   #1
allenreyes
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WM1496 - Limited No. of data can poll?

Relative to my previous post...
I encountered another problem regarding the number of data can poll to Carlo Gavazzi's PM14-96 meter...
Once I poll 3 parameters the value of the last address I mapped changed (different value as I poll the data alone).
If more than 3 parameters, one or all the data mapped to Kepserver becomes bad signal.

Test#1 "# of data poll = 2"
Vab(300658) = 114
Vbc(300660) = 111

Test#2 "# of data poll = 3"
Vab(300658) = 114
Vbc(300660) = 111
Vca(300662) = 2611 --> INCORRECT VALUE

Test#3 "# of data poll = 1... (the same address mapped during test 2)"
Vca(300662) = 111 --> CORRECT VALUE


I already tried to communicate directly on the device using Modbus Serial as the device driver on Kepware..I also tried to use 2 wire and 4 wire connection of RS485..even adjusting the Request time out set to Kepserver (0 to 30000 msec)....the outcome is still the same.

Does anyone encountered this problem to this specific device and/or other modbus devices???
Any suggestion??
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Old June 4th, 2014, 12:03 PM   #2
marcius
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danw gave you example in this post:
http://www.plctalk.net/qanda/showpos...93&postcount=8

In chapter 3.2.1 it is shown how to read 12 registers
0x280 - 0x297

Note in the request that they use function code 4
Request frame: 1 4 2 80 0 C F0 5F
1 - slave address
4 - function code (4 - read input registers)
2 and 80 - start address 280
0 and C - register count to read (c in hex is 12 in decimal)
F0 5F - CRC

Last edited by marcius; June 4th, 2014 at 12:31 PM.
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