CI853 Modbus Serial -Daisy Chain MultiDrop
We have 3 Modbus serial slave (connected in Daisy Chain) and one CI853. CI853 has 2 com port and each CI853 comm port can connect only one slave (correct me if am wrong).
Question: is it possible to have 3 modbus serial master and 3 serial slave in same network ( connected in Daisy Chain) and each master communicate with only one slave. Is this okay?
Planning to use 2 CI853 to communicate with 3 Slaves in same daisy chain link insted of one to one connection. ( Cable is already layed so bit difficult to lay new cables)
Please provide a drawing for better understanding.
It is not so clear for me how you build this daisy chain - is that sequent connection between CPU and the 3 slaves?
Usually each COM port in AC800M works as master, but you can connect up to 254 slaves to each com port. So, depends on your cabling, you can connect all the slaves (with different slave addresses) to only one COM port of CI853, in case there are cables point to point (sequence connection).
Other option is the COM3 port in the CPU. It also could be used as a master. So in your configuration you already have 3 COM ports, each could be a master. But I don't see the reason to use separate 3 master-slave lines, in order to connect 3 slaves, if it possible to connect all of them to one master.