![]() ![]() ![]() The master radio will now see all the messages sent from or to the HC controller. It does not need a Modbus slave ID number. It becomes just another drop on the present 485 multidrop comm link. ![]() Specifically, add a serial RS-485 Modbus RTU 900 Mhz freq hopping wireless radio as the master radio at station B. Take the wire away and you've got wireless, using a pair or radio modems. If you were to wire Station B to Station A you'd run a long cable from the last Station B slave on the RTU line multidrop all the way to Station A, and then connect both Station A slaves 'in series' as multidrops.
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