Elecbee 4 Channel RS485 Relay Module - Modbus RTU/AT Commands, DC 12V, 10A Load, PLC Smart Home Security

SKU: EB0045309

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Key Features

Features:

7 Advanced Control Modes: Supports "Open/Close/Momentary/Self-locking/Interlock/Delay/Read" commands—including status monitoring—ideal for testing motors, securing interlocks, or scheduling device activation in PLC, smart home, or security systems.
Dual Protocol Flexibility: Use simple AT commands (9999s max delay) for DIY projects or industry-standard Modbus RTU (255s max delay) for professional setups. Works with serial terminals (e.g., HyperTerminal) or Modbus Poll software.
Low-Power, Stable Performance: Runs on 12V DC (9-13V wide range) with minimal standby current (11-13mA) and 140mA max when all 4 relays are active. Energy-efficient for 24/7 operation in security or automation systems.
10A Multi-Voltage Compatibility: Handles 10A/250VAC, 10A/12VDC, and more—perfect for controlling cameras, LED lights, motors, or 3D printers without overload risks.
Compact, Space-Saving Design: Measuring just 80x47x19.5mm, this module fits easily into PLC expansion slots, smart home control panels, or tight security system enclosures for hassle-free installation.

Specifications

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Attribute

Value

Wireless Capability

Cellular

Model

RS485

Voltage - Input

85~265VAC

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Description

>>>Manual: Click here to open<<<

Description:

1. DC 12V power supply (voltage range 9-13V )

2. Standby current (all relays closed) 11-13MA, 1 relay open 44MA, 2 relays open 77MA, 3 relays open 110MA,4 relays open 140MA

3. "open" "close" "Momentary" "Self-locking" "Interlock" "Delay" "Read" 7 Commands

4. Two instruction-control mode : AT command and MODBUS command

5. Under the AT command ,the maximum delay is 9999 seconds Under the MODBUS command ,the maximum delay is 255 seconds

6. AT commands can be made serial HyperTerminal (serial assistant) Enter;MODBUS commands can be made serial HyperTerminal (serial assistant) OR "Modbus Poll" Enter;

7. Under the MODBUS command mode, it can support up to 32 devices in parallel

8. Size: 80 x47 x 19.5 mm

9. Maximum load: 10A / 250VAC, 10A / 125VAC, 10A / 30VDC, 10A / 28VDC, 10A / 12VDC

Application:

- Automated industry PLC

- Smart Home,Home Automation ,Wiser Home;

- Identification system;

- Motor FW & BW

Typical Applications:

1. AT command mode (A5 = OFF), in this mode can be through the serial HyperTerminal (serial assistant) enter a simple AT command control relay. AT command mode time up to 9999 seconds

2. MODBUS command mode (A5 = ON), you can control a variety of ways: Serial Hyper Terminal Control (need to manually add the CRC), Modbus Poll software control (software automatically add the CRC), PLC or MCU process control

4-Channel-RS485-Relay-Module-Modbus-RTU-AT-Command-Remote-Control-Switch-for-PLC-PTZ-Smart-Home-Secu-1650584

Wiring Diagram:

1. DC 12V control circuit,Wiring diagram below. "LOAD" may be camera,LED lights, fans, motors and other DC 12V equipment

2. DC 1-100V OR AC 85-265V control circuit,Wiring diagram below(Note:If not DC 12V load, need another DC 12V power supply). "LOAD" may be LED lights, fans, motors Lights, fluorescent lights, solar water heaters and other DC AC equipmen 4-Channel-RS485-Relay-Module-Modbus-RTU-AT-Command-Remote-Control-Switch-for-PLC-PTZ-Smart-Home-Secu-1650584

3. DC 1-100V OR AC 85-265V control circuit,Wiring diagram below(Note:If not DC 12V load, need another DC 12V power supply). "LOAD" may be Machine tool ,CNC,3D Printer,LED lights, fans, motors and other DC AC equipment 4-Channel-RS485-Relay-Module-Modbus-RTU-AT-Command-Remote-Control-Switch-for-PLC-PTZ-Smart-Home-Secu-1650584

Test Software:

Serial HyperTerminal:

Modbus Poll

1 x 4 Channel DC 12V RS485 Relay Module

Shopping Guide

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