Re: [foxboro] FBM230/Modbus slave too fast problem
- From: Pablo Lioi <plioi@xxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Sat, 14 Mar 2015 15:57:45 +0000
Gerrit,Thanks for your answer!I really didn't check each byte of the response,
only the delay between the last byte of the query and the first byte of the
response, but I guess such behavior would have been flagged by the protocol
analyser. My protocol analyser understands Modbus and decodes master and slaves
messages, and it shows no errors.The Schneider TSX ETG100 gateway cannot be
configured to use RTS/CTS handshaking. I did another test with a MOXA M3180
Gateway. This gateway can be configured to use RTS/CTS hardware handshaking, so
I tried that, too. It made no difference. Unfortunately, the M3180 doesn't
feature configurable delays on the control lines, so I was not able to delay
the response message.Unfortunately I didn't save the analyser results to disk.
Anyway, I believe the file format is proprietary and the only way to look at it
is with the analyser software (Frontline SerialTest Async). I will have a look
to see if there is an export option.Thanks againRegardsPablo Lioi
> From: gerrit.vandoorn@xxxxxxxxxxxxxxxxxxxxxx
> To: foxboro@xxxxxxxxxxxxx
> Date: Sat, 14 Mar 2015 04:02:46 -0400
> Subject: Re: [foxboro] FBM230/Modbus slave too fast problem
>
> Hi Pablo,
>
> I have seen similar behavior at a customer site but after investigating all
> the bytes being replied by the slave it appeared that there was a gap more
> than 3.5 times the character time between the datapart of the response and
> the checksum. Therefore the response was rejected. In another case, the Slave
> couldn't handle too fast requests where I wired all the RS-232 control
> signals to let the CTS/RTS handshaking slow down the communication. Not sure
> if that is possible on the gateway. Sometimes, you can set delays in gateways
> on handshaking.
>
> You analysed the data with a protocol analyser. Can you sent me a detailed
> dump of the communication with timestamps on all bytes being sent and
> received?
>
> Best regards,
> _____________________________________________________________________________________
>
> Gerrit Van Doorn | Schneider Electric | Industry Business | Netherlands |
> Senior Application Engineer
> Phone: +31 355484188 | Fax: +31 355484185 | Mobile: +31 653174883
> Email: gerrit.vandoorn@xxxxxxxxxxxxxxxxxxxxxx | Site:
> www.schneider-electric.com | Address: Baarnsche dijk 10, 3741 LS Baarn,
> Utrecht, Netherlands
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