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I've got a small network setup at a customer site: wireless modem, linksys router, and then a modbus controller with 3 slaves. One of the slaves is not communicating with the master - no response is the error code I get on the master. I have used a modbus tcp/ip tool and have verified that the slave is transmitting the data, so I suspect the controller.
What I'd like to do is connect my laptop again as a node, and just watch the traffic between my controller's attempted queries (like a 3rd party observer) to try and pinpoint the problem. Are there any software tools out there that can do that (ie monitor traffic between other devices, NOT have your pc simulate master and or slave). I've tried wireshark, but I can only seem to get it to read traffic to and from my laptop.
What I'd like to do is connect my laptop again as a node, and just watch the traffic between my controller's attempted queries (like a 3rd party observer) to try and pinpoint the problem. Are there any software tools out there that can do that (ie monitor traffic between other devices, NOT have your pc simulate master and or slave). I've tried wireshark, but I can only seem to get it to read traffic to and from my laptop.