USB One Channel Relay PCB


KMtronic USB Relay Controller One Channel


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 One RelayPCB


KMtronic LTD

- Fully assembled and tested
- Fully powered from USB
- For 12V/24VDC 15A or 120V/220V AC at 10A max.
- Can be used with  LabVIEW, ProfiLab, DAQFactory, TestPoint, DASYLab, VEE

USB to serial interface:


Complete including:
One USB relay board

Dimensions (PCB board):

90 mm / 35 mm


Relays have Normally Open (NO) and
Normally Closed (NC) Contacts each capable
of switching max:
- 12VDC/15A
- 24VDC/15A
- 125VAC/15A
- 250VAC/10A

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

BOX Version:

Customers projects:

Software Examples:






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