U
Hi
I am to connect a modbus device to a plc. my plc has a rs485 port on itself, but the problem is that i don't know the pinout. Can anybody tell me How to determine different pins on a rs485 port.
PS: My plc is a Sprecher and i have tried to connect modbus pairs to all pins to test which ones are D+ and D- but i couldn't get any result. it seems that i have a 4 wire port and i should connect it to a 2 wire device. the problem is that i don't know which pins are rxd+ rxd- txd+ and txd-
I am to connect a modbus device to a plc. my plc has a rs485 port on itself, but the problem is that i don't know the pinout. Can anybody tell me How to determine different pins on a rs485 port.
PS: My plc is a Sprecher and i have tried to connect modbus pairs to all pins to test which ones are D+ and D- but i couldn't get any result. it seems that i have a 4 wire port and i should connect it to a 2 wire device. the problem is that i don't know which pins are rxd+ rxd- txd+ and txd-