Problem with M-Bus communication

[maroo159]

Hello everybody,

I've got problem with M-Bus protocol in LabView.

I have heat meter with RS232 communication module which is connected to PC by RS232/USB adapter. The hardware is okay, because I've got programs such as MBSheet which works great. The problem is with LabView.

If I send 10 40 01 41 16 (SND_LKE) I'll get correct data (in all programs) - E5

If I send 10 7B 01 7C 16 (REQ_UD2):

MBSheet answer:

68 74 74 68 08 01 72 35 05 43 01 00 00 39 04 ED 00 00 00 0C 78 35 05 43 01 0C 0E 00 00 00 00 0C 12 00 00 00 00 02 2D 00 00 02 3B 00 00 02 59 FF 7F 02 5D FF 7F 0B 26 88 02 00 3B 26 00 00 00 8C 10 0E 00 00 00 00 04 6D 1D 09 D0 19 02 61 00 00 12 2D 00 00 12 3B 00 00 8C 40 12 00 00 00 00 8C 80 40 12 00 00 00 00 8C C0 40 12 00 00 00 00 8C 80 80 40 12 00 00 00 00 6C 16

LabView answer:

68 74 D1 82 83 5C 70 CE 8D 05 0D 13 1C 60 00 39 11 76 17 C0 00 00 18 C2 52 AC B0 E8 C0 0C 39 06 10 C0 00 00 18 12 08 60 80 00 00 12 0C 31 C0 00 02 3B 00 00 12 4C D9 F9 23 5C DD F9 B3 9C 72 A2 02 00 76 33 0E 30 80 00 8C 10 0E 00 00 02 08 60 C1 6D 1A 09 41 19 02 61 00 00 12 08 31 C0 00 12 ED 06 10 C0 C6 40 12 01 04 10 C0 00 8C 80 40 12 01 04 10 C0 00 8C C0 01 23 18 60 00 00 00 62 0E 78 E0 40 12 01 04 10 C0 00 63 59 FE 

They differ from each other. Additionaly I get error:

Error -1073807253 occurred at VISA Read in mbus.vi
Possible reason(s):
VISA: (Hex 0xBFFF006B) A framing error occurred during transfer.

I think that problem is with communication parameters, but I have no idea what parameters should I choose.

Thank you for your help.

[nyc_(is_out_of_here)]

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@maroo159 wrote:

I think that problem is with communication parameters, but I have no idea what parameters should I choose.

Thank you for your help.

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The communication paramters are determined by the instrument.

This information is either in the manual or the example program you are using.

[maroo159]

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@nyc_(is_out_of_here) wrote:

The communication paramters are determined by the instrument.

This information is either in the manual or the example program you are using.

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That's true, but my device has not any manual with this information.

Anyway, problem is solved. Parity in VISA configuration should be "Even".