RM2U USB Controlled Relay Module 2-Channel
RM2U is a 2-channel USB-controlled relay module. It can be used to control electrical devices remotely from a PC over a USB port such as lamps, motors, and locks. RM2U features a wide operating voltage range (9-40V) and supports serial communication baud rate speeds starting from 2400 up to 115200 bps. RM2U module is well protected, filtered, and fully isolated.
Features
Supports Windows XP, 7, 10, and 11.
Supports two relay outputs.
Wide operating voltage range: 9~40 DCV.
Control: Serial communication.
Driver: CH340.
Supported baud rates: 2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, 76800, and 115200.
Interface: USB type B connector.
Simple control protocol: Just two-character commands.
All outputs are optically isolated.
Both normally open and normally close relay contacts are available.
Reverse polarity protection.
On-board DC power filter.
Power LED indicator.
Serial communication LED status.
LED indicator for each relay.
Mounting: Four (Ø 3.5mm) mounting holes for easy installation.
Dimensions: 100 X 55 X 21mm.
PINOUT
Specifications
Parameter
Value
Model
RM2U
Channels
2
Operating Voltage
9~40VDC
Control Interface
USB (CH340 USB-to-UART)
Supported Baud Rates (bps )
2400, 4800, 9600, 14400, 19200, 28800, 38400, 57600, 76800, 115200
Command Protocol
Simple two-character serial commands
Output Type
Opto-isolated SPDT relays (NO/NC)
Indicators
Power LED, Serial activity LED, 2× Relay LEDs
Connector
USB Type-B (control); screw terminals for relay/load wiring
Mounting
4× Ø3.5mm mounting holes
Dimensions
100mm x 55mm x 21mm
Applications
PC-based automation and test rigs for switching lamps, motors, solenoids and small actuators.
Home and building control systems requiring isolated relay outputs driven from a computer.
Remote switching for lab equipment, bench setups, and field prototypes.
Integration with microcontroller systems via serial bridge for logging, timed switching or sequencing.
Replacement or upgrade in control panels where USB control and optical isolation are required.
Package Contents
1x RM2U USB Controlled Relay Module 2-Channel.
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