Product model: E-3. Communication chip: CH340 Communication protocol, : serial communication, Send the hexadecimal 0xAA relay with the serial port assistant. Send 0xBB relay remains off. Send 0xCC relay to work for 1 second to stop; (jog) . Communication : (9600, 8, NONE, 1) rate: 9600, 8 , no parity, 1 stop bit 1. Description: 1 . Controller Chip: onboard high performance microcontroller chip. 2 . Control Chip: onboard CH340 USB control chip 3 . LED Indicator Lamp: onboard power LED indicator lamp and relay status LED indicator lamp.4 . Relay: onboard 5V, 10A/250V AC, 10A/30V DC relay. 5 . Protection Function: overcurrent protection and relay diode current protection function 2. Communication Protocol: LC defaults communication rate: 9600bps LC communication protocol: Data (1): (defaults 0xA0) Data (2): switch address code (defaults 0x01, means the first channel switch) Data (3): operation data (0x00 is OFF, 0x01 is on) Data (4): check code For Example: Open the : A0 01 01 A2 the : A0 01 00 A1 3. Using Methods: Step 1: plug the USB relay module on the computer, and install CH340 USB to serial port chip driver : open the STC-ISP, SSCOM32 serial port debugging software, and select the rate as 9600. Send A0 01 01 A2 to open the relay in the form of hex, select manual send or auto send Manual Send: select the rate as 9600, check "HEX send"; input the instruction A0 01 01 A2 or A0 01 00 A1, then click "send"; then you can open or the relay Auto Send: select the rate as 9600, click "expand" SSCOM32 interface; input instruction A0 01 01 A2 and A0 01 00 A1, check "HEX send" and input the interval time of auto sending, check "auto send", then the relay can automatically to open or color: blue Material: metal size: 63*16.5*17mm Package Contents: 1 * Module Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.