How to physically connect a voltage monitoring meter device(ND20) with RS485 out, to a computer with Modbus RTU? Should I use a converter to RS232 and connect to serial COM port of computer? Should I use RS485 to USB converter to connect? Can I connect directly to serial COM port from A,B and Ground of RS485 using D9 connector pin? Then A,B and Ground to which pins of D9 in Modbus RTU?
Electronic – How to connect RS485 Device to computer in Modbus RTU
modbusrs485
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Best Answer
If your computer doesn't support RS485 protocol, and if we're talking about regular PC's it most probably doesn't, then you cannot directly connect A and B to serial port. I would suggest using an USB-RS485 converter.