RTU Modbus sniffer

[MarkoBursic]

Can this application work also as Modbus sniffer? I would like to listen the conversation between two devices RTU Master<->Slave, so I don't want my PC acts as Master, just listen and decode what they send.

[sanny32]

No, there is no such functionality.

[g6094199]

to bring this up again.

since we have the show traffic option it would be nice to have the ability to show the bus data as slave.

backougrund ist: we have a modbus to LoRaWAN adapter which acts as master (asks for specific content on the bus) but ALSO transmitts EVERY data that is transfered from other masters/slaves on the bus.

[MarkoBursic]

You can try with Wireshark + additional feature https://github.com/jzhvymetal/WiresharkSerialAdapter. There is also a practical manual from ABB: https://library.e.abb.com/public/053acd5e47a04d938e15537a5d253e74/Technical_Note_179_WiresharkForModbusRTU.pdf?x-sign=zHGIPySTjLhl7dpEkso9HT4DePnDDowfPgQ6XIJ7IXlmfbUxtfYU5tLt4aiRTA3M.

Similarly you an also snif BACnet MS/TP: https://library.e.abb.com/public/2b037b07870b4af3831e88afe0bcf1a2/LVD-EOTKN123U-EN_WiresharkforBACnetMSTPtrafficcapture_REVA.pdf

[sanny32]

Application show traffic between modbus client (master) and server (slave). There is no option to sniff other traffic.

[g6094199]

it would be usefull.
can you add it to your the featurerequest list?

[sanny32]

There is no plan to do this.