1、DC7 to DC30V: The RS485 computer control relay module is general for DC7 to DC30V wide voltage 2、CHIP MAX485: The RS485 computer control relay module uses chip MAX485, communication is glossy 3、HEXADECIMAL CODING: The RS485 computer control relay module can use the serial port assistant to send the hexadecimal coding: 01AAFF relay is open, 01BBFF relay is closed, 01CCFF relay is jog 4、SMALL and COMPACT: The small and compact body does not take up too much use space, which is convenient for storage and use 5、SIMPLE OPERATION: Installation is simple and convenient, the relay module can be used without complicated process Item Type: RS485 Computer Control Relay Module Material: Plastic Product Model: YF 9 Product Size: Approx. 77.8 x 47.5 x 18.8mm / 3.1 x 1.9 x 0.7in Communication Chip: MAX485 (imported chip) Communication Format: (9600, 8, NONE, 1) Baud Rate: 9600, 8 Bits, No Parity, 1 Stop Bit Communication Protocol: Can Use the Serial Port Assistant to Send the Hexadecimal Coding: 01AAFF Relay is Open, 01BBFF Relay is Closed, 01CCFF Relay is Jog 1 x RS485 Computer Control Relay Module