[foxboro] FBM230/Modbus slave too fast problem
- From: Pablo Lioi <plioi@xxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 11 Mar 2015 17:28:25 +0000
Hi everybody,
I'm sending this again because for some reason carriage returns seem to have
been lost and the post was difficult to read.
In the past I had a serious problem with an FBM230 with Modbus protocol
communicating with a slave using RS-232, in RTU mode.
When the slave response to any query from the master arrived too fast, the FBM
would ignore the response and retry. I finally worked around the problem
delaying the response from the slave a few milliseconds using a setting (at the
slave device) that was meant for radio communication (RTS to TxD delay).
I am now facing the same problem again, with another slave device. The problem
is that this time I have no way to delay the slave response. I tried using
RTS/CTS handshake on the RS-232 line, but the problem remains. I know for sure
that cable and switch settings at the TA are ok because I'm looking at the line
with a protocol analyser and see correct query and response messages.I would
like to know if somebody else has experienced this problem too.
Regards
Pablo Lioi
TOTAL AUSTRAL S.A.
Tierra del Fuego - Argentina
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