B&B Electronics 485OPDR

RS-422/485 Optically Isolated Repeater, DIN Mount, 1200m Distance, 0.7W 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. Requires an external power supply not included.