Optical isolation protects your
devices from transient surges and ground loops on your data line. Model 485OPDR
repeater adds 4,000 feet (1.2 km) and another 32 nodes to an RS-485 data
circuit. By configuring one side as RS-422 and the other as RS-485, Model
485OPDR can act as a converter to allow your four wire RS-422 equipment to talk
to a 2-wire RS-485 device. Model 232OPDR isolates four RS-232 data signals. LEDs
indicate data transmission (232OPDR also has power-on LED). Requires external
power supply not included.