LCUS-2 PLC USB Serial Control Relay Module

LCUS-2 PLC USB Serial Control Relay Module provides a straightforward and reliable interface for controlling high-power loads directly from a computer via a standard USB port. This module effectively bridges the gap between digital software control and physical power switching. The integrated USB-to-Serial chip and microcontroller allow users to issue simple serial commands to toggle the two onboard relays. Consequently, you can easily develop custom PC software (using languages like Python, C#, or Java) to automate tasks, control home appliances, or manage industrial equipment without needing complex PLC programming knowledge. Therefore, the LCUS-2 is an ideal solution for hobbyists and professionals who need isolated, USB-controlled power switching.

Key Features:

• USB Interface Control: Utilizes a CH340 or equivalent USB-to-Serial chip, enabling direct control from any computer that supports a virtual serial port (COM port).
• Two Independent Relays: Features two 5V relays, each providing isolated single-pole, double-throw (SPDT) contacts for flexible switching of both AC and DC loads.
• High Current Capacity: Each relay contact supports switching currents up to 10 A at 250 V_AC or 30 V_DC, offering robust power handling.
• Status Indicators: Onboard LEDs clearly indicate the power status and the current ON/OFF state of each relay, simplifying debugging and monitoring.
• Simple Protocol: The module responds to a straightforward, often ASCII-based, serial command protocol, making software development quick and simple.

Technical Specifications:

• Control Chip: CH340 or equivalent USB-to-Serial bridge
• Relay Type: 5V DC Coil Relay (2 Channels)
• Maximum Load Voltage (AC): 250 V_AC
• Maximum Load Voltage (DC): 30 V_DC
• Maximum Load Current (per channel): 10 A
• Input Voltage (Power): 5 VDC (Supplied via USB)
• Baud Rate Support: Standard serial baud rates (e.g., 9600, 115200 bps).

Mechanical Specifications:

• PCB Material: FR-4 Grade PCB
• Connectors: USB Type B receptacle (for connection to PC) and screw terminals (for load wiring).
• Mounting Holes: Includes mounting holes for fixed installation in an enclosure.
• Coil Voltage: 5V (Drives the relay coils directly from the USB power).

Dimensions:

• Module Length: ≈ 50 mm
• Module Width: ≈ 40 mm
• Module Height (including relay): ≈ 18 mm
• Terminal Type: High-quality screw terminals for secure wiring.

Pinout and Wiring:

• USB Port: Connects directly to the host PC for power and control signal communication.
• Terminal Block 1 (Relay 1): Includes three pins: NO1 (Normally Open), COM1 (Common), and NC1 (Normally Closed).
• Terminal Block 2 (Relay 2): Includes three pins: NO2 (Normally Open), COM2 (Common), and NC2 (Normally Closed).
• Wiring Note: You must connect the power source and the load in series across the COM pin and either the NO (to switch ON when relay is activated) or NC pin (to switch OFF when relay is activated).

Datasheet Reference:

• Download CH340 USB-to-Serial Bridge Datasheet (Core Component)

Commonly Used in:

• PC-Based Automation: Systems where a central computer manages simple switching tasks remotely.
• Testing and Prototyping: Quickly setting up automated test benches for controlling external power supplies or instrumentation.
• Home Automation (DIY): Controlling lights, fans, or small appliances directly via PC software.

Applications:

• Automated Power Cycling: Turning power ON/OFF to network routers, cameras, or servers for remote rebooting.
• Solenoid and Motor Control: Driving low-current DC solenoids or using the relay to switch larger external contactors for motor control.
• Model Railroad Control: Managing track switches, lights, and accessories using computer-based timing.

Equivalent Models:

• Relay Shields for Arduino/Raspberry Pi: However, these require a micro-controller platform and do not offer direct PC-USB serial control like the LCUS-2.
• Other USB-Controlled Relay Modules (e.g., KMTronic): Functionally similar devices that operate using different serial protocols but achieve the same USB-to-relay switching goal.
• USBRD02 (USB Relay Board): A comparable two-channel USB relay board that supports HID or similar direct USB protocols, offering an alternative interface.

Package Includes:

• 1 x LCUS-2 USB 2 Channel Relay Module USB Intelligent Control Switch Relay Module