Re: [foxboro] FBM230/Modbus slave too fast problem
- From: "Cleddon" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "cleddon@xxxxxxx" for DMARC)
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 11 Mar 2015 15:18:10 -0400
Are you using Modbus rtu or ASCII? On radio units I have had better luck with
Modbus ASCII.
Sent from my iPhone
> On Mar 11, 2015, at 1:28 PM, Pablo Lioi <plioi@xxxxxxxxxxx> wrote:
>
> 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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