The 12VDC 4-Way 4-Channel Relay Module with DB9 Serial Port RS232 Interface is a versatile control board designed for switching four separate high-power loads using a standard RS232 serial connection. With a built-in DB9 interface and compact relay board, it’s ideal for automation, industrial control, home systems, access control, and remote switching applications where easy serial communication and reliable power control are required.

Key Features:

• 4-Channel Relay Output: Controls four independent loads
• 12VDC Power Supply: Standard industrial control voltage
• DB9 RS232 Interface: Easy communication with PCs, PLCs, microcontrollers, or serial controllers
• Optocoupler Isolation (model dependent): Improves noise immunity & protects logic side
• LED Indicators: Visual status indication for each relay channel
• Screw Terminal Outputs: Secure and convenient power/load wiring
• Compact Module: Space-efficient design for panels and enclosures

Specifications:

• Type: 4-Channel Relay Module with Serial RS232 Control
• Power Input: 12VDC
• Interface: DB9 (RS232) serial port
• Number of Relays: 4 independent channels
• Relay Ratings (typ.): 10A @ 250VAC / 10A @ 30VDC (check exact model datasheet)
• Indicator LEDs: One per relay channel
• Communication Level: Standard RS232 signals via DB9
• Relay Drive: On-board driver transistors/optocouplers (depending on model)
• Terminals: Screw terminals for relay outputs and power
• Mounting: PCB module with mounting holes
• Operating Current Ratings:
  • Standby current (all relays closed) 18mA
  • 1 Relay 50mA
  • 2 Relays 81mA
  • 3 Relays 110mA
  • 4 relays 140mA

Applications:

• Industrial automation and machine control
• Home automation and smart switching systems
• Remote device control via serial communication
• Security systems, alarms, and access control panels
• Serial interface control for motors, lamps, pumps, and actuators

Command Reference: UART Relay Module Commands Reference