danw
Lifetime Supporting Member
You have working Modbus slaves. Can you connect from your PC (running a Modbus master program) through the 232/485 converter and read a value from a register on one of your previous Modbus slaves, proving the PC, client program, converter, and wiring?
You know the comm setup for drive slaves. It is ? 9600 8N1?
Are your pre-existing slaves running the same comm settings?
When you added the drive slaves to the wiring network, are they added without spurs, but daisy chained in multidrop fashion?
When you get response, is that no response from the PC/converter/single slave or with other devices on the network?
Are there terminating resistors on the network A or B lines?
You know the comm setup for drive slaves. It is ? 9600 8N1?
Are your pre-existing slaves running the same comm settings?
When you added the drive slaves to the wiring network, are they added without spurs, but daisy chained in multidrop fashion?
When you get response, is that no response from the PC/converter/single slave or with other devices on the network?
Are there terminating resistors on the network A or B lines?