Question about Lantronix (200.2071)

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Tcp slave messages are not forwarded to rtu master

We are using lantronix XPress-DR IAP device to connect a modbus RTU Master to a Modbus TCP slave.The modbus RTU master requests are successfully getting converted in to TCP frames and the TCP Slave Gives the Valid Response to the Converter.But the Converter does not convert this TCP response in to RTU response.So the RTU master is not getting any reply from the Converter.Please let me know what is the probable cause and how to troubleshoot this problem

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I think your last sentence there might be what the situation really is.  Your not getting a reply back. Maybe you should check the response timeout the gateway has set on it for the slave.  You probably already know a slave’s response time can fluctuate wildly depending on the nature of the request sent, so maybe the timeout setting is too short? Its a place to start. .

Posted on Oct 22, 2007

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