LCUS2 USB DualRelay Module — Key Benefits Direct, PCcontrolled switching of two relays using simple serial commands; ideal for automating devices without additional programming hardware. Stable operation thanks to an integrated USBtoserial chip and a dedicated microcontroller; reduces communication errors and simplifies setup. Small, twochannel relay design lets you control two independent circuits from a single USB port. What it does Controls two SPDT relays (dualchannel) via USB by sending hexadecimal serial commands from a computer. Provides reliable on/off switching for external loads when controlled from serial debugging software or custom serial applications. Compatibility and performance Uses a CH340type USBtoserial interface chip (driver required) for broad compatibility with Windows and serial software. Works with common serial debugging tools such as STCISP and SSCOM32. Default communication settings: 9600 baud. How to use (quick steps) 1. Connect the LCUS2 USB relay module to your computer via USB. Install the CH340 USBtoserial driver if required. 2. Open a serial terminal/debugging tool (for example STCISP or SSCOM32). Set the serial port to 9600 baud. 3. Send hexadecimal (hex) commands to control relays: To open (turn on) the first and second relays: send A0 01 01 A2 and AO 02 01 A3 (hex). To close (turn off) the first and second relays: send AO 01 00 A1 and AO 02 00 A2 (hex). 4. You may send commands manually from the terminal or automate them from software that can send hexformatted serial data. What makes it stand out Simple commandbased control: no custom firmware flashing required—use standard serial commands. Dualchannel configuration: two independent relays controlled from a single USB connection. Designed for stable serial communication with an onboard microcontroller and USBtoserial chip. Practical applications (examples) Home automation: switch lighting, pumps, or other appliances from a PC or home controller. Test and development benches: toggle power to DUTs (devices under test) or control test sequences from a serial terminal. Small industrial or lab control: remotely operate valves, relays, or actuators where two independent channels are sufficient. Included in package 2PCS Dual USB Relay Module (LCUS2) Notes and precautions Ensure the CH340 driver is installed for the host computer to recognize the USB serial port. Confirm your terminal software can send hexadecimalformatted data and is set to 9600 baud. Verify the voltage and current specifications of the external circuits you switch are within the relay module's rated limits (refer to specific hardware documentation before connecting power loads).