The RS485_TERM board is used for completing the RS-485 BUS with one 120 ohm resistor. In addition, two bias resistors are integrated as well. The wiring of the resistors to the green screw terminal can be omitted. This board only has to be plugged in and simplifies the installation. Only one RS485_TERM board is required per system. This product can be always used if the last device on the bus has flat ribbon cable connection.