need help on modbus RTU: do not know the meaning of the other output registers

Hi all

I use LV 8.5, a programmer time & 1st novice LV to post msg in discussion, so please let me know if I missed something important.

In any case, I'm 2 power meter data acquisition (1st is CPM-50 model, 2nd is MWH - 10, the two brand ADTEK). the Protocol of these devices are modbus RTU. I have two targets to:

1 acquire data using RS - 485 (portable <-->meters of power)

2. acquire data using ethernet (laptop <-->converter series/ethernet <-->meters of power)

now I'm in the 1st part, I use the local brand USB-RS485 converter & I think that there is no problem in the port itself (past the loopback test). I create a program using LV samples Mo using w / these port settings: 9600, 8, N-1 as databit baud, parity, stop bit respectively (the same data format of the device: see page 17/42 of the manual). I use the query.vi series of MB that I customized to eliminate the error timeout 6101 (see attached photo).

Problem: I can read the right data into the output register , but is located in the 5th element of the 1 d array. In the peak of the attached example, I'm currently reading the baudrate of the device (see manual pg 26/42: address 0102 h = 258 d). so I read the 9600 w/c is correct. I also had the correct readings of other addresses of parameter which is also located in the 5th element of the 1 d array. Note: I never tried to read data from power because the meters are not yet installed in the cabinets of power (maybe installed nextweek leave)

Question:

1. What is the significance of the first four output records in my table 1 d of output?

2. why I got 5 output registers eventhough I'm asking only 1 quantity?

3 read the correct data in the 5th element normal?

I want to just be deleted in the data I read before jumping in part 2 (connection via ethernet). If I forgot some valuable information, let me know. Thanks in advance!

Kind regards

Ivel


Tags: NI Software

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