USB to RS232 / RS485 / RS422 Optically Isolated Converter
RS232 Connections.
RS 485 Connections:
RS 422 Connections:
RS422/485 Connections & Termination Resistors.
For 2 wire connect D+ or Tx+ to D+ or Tx+ & D- or Tx- to D- or Tx-.
For 4 wire connect TX+ to RX+, TX- to RX- & RX+ to TX+ & RX-
to TX-. Use the inbuilt terminator resistors if need