USB One Channel Relay BOX for DC Power


KMtronic USB Relay Controller, One Channel, BOX for DC Power


A general purpose Relay board for connection to a PC's USB port using VCP (Virtual COM port). Control devices using your PC. USB Relay controller allows a PC to control external devices using simple RS232 commands. Relay is fully powered from the USB bus.

KMtronic USB Relay Controller One Channel, BOX for DC Power



KMtronic LTD

- Fully assembled and tested
- Fully powered from USB
- For 12V/24VDC 2A max.
- Can be used with  LabVIEW, ProfiLab, DAQFactory, TestPoint, DASYLab, VEE

USB to serial interface:


Complete including:
One USB relay board

Dimensions (PCB board):

100 mm / 58 mm / 24 mm


Capable of switching max:
- 12VDC/2A
- 24VDC/2A

Connector Type A: 2.1mm DC Socket
Connector Type B: 2.1mm DC Plug
Cable Length 40-45 cm

Relay datasheed:

Fully powered from USB

Operation Range:

0°C to +80°C

Drivers :

All Windows systems, Windows RT, Linux,
Mac OS 8, Mac OS 9, Mac OS X,
Android, Raspberry Pi, Arduino ADK, 
Arduino with USB Host Shield

Communication Parameters:

8 Data, 1 Stop, No Parity
Baud rate : 9600

“FF 01 00” (HEX) or “255,1,0” (DEC) - OFF command
“FF 01 01” (HEX) or “255,1,1” (DEC) - ON command
“FF 01 03” (HEX) or “255,1,3” (DEC) - Status request
NOTE : Each command consists in 3 binary bytes (shown in hexadecimal below) without any space!

Windows Test software:

KMTronic USB Relay Test software

Customers projects:

Software Examples:





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