Setting and checking incident light intensity for Panasonic digital sensors FX-501/502/301/305, LS-501/403, DPS-401/402 and input unit SC-A01/A02/T1JA that are scattered inside and outside equipment can be carried out remotely for all sensors by using the SC-GU1-485, which greatly improves ease of operations such as monitoring equipment that is running and also equipment starting and maintenance. Used when the output signal is sent via a SC-GU1-485 to the PLC. If the output signal is sent directly to the PLC, a quick-connection cable (CN-72-C*, CN-71-C*) should be used. RS-485 communication provides a high level of general compatibility so that any type of PLC can be used. Integration with existing systems is possible without the need to change PLCs. High-speed communication at a maximum speed of 57.6 kbperator to instantly check information such as the incident light intensity and output statuses of the digital sensors. A maximum of 31 nodes can be connected in series. This is ideal for flexible handling when the sensors are to be installed in scattered locations or if more sensors are added.