C
I've got a situation where I have 3 modbus slave devices connected together as 2 wire 485 which I have coming into a 485 to 232 converter with a short cable which is connected to a serial Freewave Radio (talking 232). The other radio is connected to a PLC which is the modbus master. I had these devices setup correctly originally and was able to both send and receive data from all 3 slave devices. However, after about 12 hrs to a day of communicating one or two of the devices stop communicating, although one device always stays connected. The only way I've found so far to cure the problem is to reset the devices that are no longer communicating. I just read on several websites that modbus 232 only supports 1 master and 1 slave - so my question is could this be part of my problem since I am using a 232 to 485 converter in my setup? Any other suggestions to the problem would be helpful as well.