LCUS-1 USB Relay Module 1/2 Channel Intelligent Control Switch

LCUS-1 USB Relay Module — Intelligent PC-Controlled Switching

Take full command of your electronic switching needs with the LCUS-1 USB Relay Module. Featuring a stable, high-performance onboard microcontroller and the trusted CH340 USB-to-serial chip, this compact PCB board lets you control relay on/off states directly from your computer — simply by sending serial commands through any standard serial debugging software. Ideal for hobbyists, engineers, and automation enthusiasts alike.

Made in Mainland China.

Key Features

• High-Performance Microcontroller: Onboard MCU delivers reliable, fast response to every command.
• CH340 USB Control Chip: Industry-standard USB-to-serial converter for broad OS compatibility and easy driver installation.
• Dual LED Indicators: Separate onboard LEDs for power status and relay state — always know your module's condition at a glance.
• Heavy-Duty Relay: Onboard 5V relay rated at 10A / 250VAC and 10A / 30VDC — built for long life with up to 10 million continuous switching cycles.
• Built-In Protection: Overcurrent protection and relay diode freewheeling protection for enhanced circuit safety.
• Wide Operating Temperature: Reliable performance from -40°C to +85°C.
• Customizable & Expandable: Supports multi-channel configurations for scalable automation projects.

Technical Specifications

• Model: LCUS-1
• Channels: 1 or 2
• Control Chip: CH340 USB-to-Serial
• Relay Rating: 10A / 250VAC & 10A / 30VDC
• Operating Temperature: -40°C to +85°C
• Package Type: DIP
• Baud Rate: 9600
• Origin: Mainland China

LC USB Switch Communication Protocol

Control the relay via simple 4-byte HEX serial commands:

• Data (1): Start identifier — default 0xA0
• Data (2): Channel address — default 0x01 (first channel)
• Data (3): Operation — 0x01 = ON, 0x00 = OFF
• Data (4): Checksum

Open relay: A0 01 01 A2
Close relay: A0 01 00 A1

How to Use

1. Step 1: Plug the USB relay module into your computer and install the CH340 USB-to-serial chip driver.
2. Step 2: Open a serial debugging tool (e.g., STC-ISP or SSCOM32). Set the baud rate to 9600.
3. Step 3 — Manual Send: Check "HEX Send", enter A0 01 01 A2 to open the relay or A0 01 00 A1 to close it, then click "Send".
4. Step 4 — Auto Loop: In SSCOM32, open the "Expansion" panel, enter both commands, check "HEX Send" and "Auto Loop", then set your desired interval for fully automated switching.

Learn more: OSHA on personal protective equipment

Frequently Asked Questions

Q: What software do I need to control the LCUS-1 USB Relay Module?

A: You can use any standard serial port debugging software that supports HEX command input, such as STC-ISP or SSCOM32. Set the baud rate to 9600 and send the appropriate HEX commands (e.g., A0 01 01 A2 to open, A0 01 00 A1 to close) to control the relay.

Q: Does the LCUS-1 relay module work on Windows, Mac, and Linux?

A: The module uses the CH340 USB-to-serial chip, which has drivers available for Windows, macOS, and most Linux distributions. Simply install the appropriate CH340 driver for your operating system and the module will be recognized as a virtual COM port.

Q: What load can the LCUS-1 relay safely switch?

A: The onboard relay is rated for up to 10A at 250VAC or 10A at 30VDC. It is designed for up to 10 million switching cycles. Always ensure your connected load does not exceed these ratings for safe and reliable operation.

Q: Can I control multiple channels or devices with this module?

A: Yes. The LCUS-1 supports 1 or 2 channel configurations. For multi-channel use, you can address individual channels by changing the channel address byte in the HEX command (e.g., 0x01 for channel 1, 0x02 for channel 2). Multiple modules can also be daisy-chained for larger automation setups.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.