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

The general purpose of the Relay board is connection to a PC's USB port using VCP (Virtual COM port). Control devices using your PC.

The general purpose of the Relay Controller is connection to a PC's RS232 COM port. Control devices using your PC.

A low cost general purpose Relay Output board for connection to a PC's printer port. Control devices using your PC.

The general purpose Two Relay board - 12V

The general purpose Eight Relay board - 12V

The general purpose Four Relay board - 12V

The general purpose of RS-485 Eight Channel Relay Controller. Control devices using your PC. RS485 BUS ID: 01, Relays: 1-8.

The general purpose of RS-485 Eight Channel Relay Controller. Control devices using your PC. RS485 BUS ID: 02, Relays: 9-16.

The general purpose of RS-485 Eight Channel Relay Controller. Control devices using your PC. RS485 BUS ID: 03, Relays: 17-24.

The general purpose of RS-485 Eight Channel Relay Controller. Control devices using your PC. RS485 BUS ID: 04, Relays: 25-32.

The general purpose of RS-485 Eight Channel Relay Controller. Control devices using your PC. RS485 BUS ID: 05, Relays: 33-40

The general purpose of RS-485 Eight Channel Relay Controller. Control devices using your PC. RS485 BUS ID: 06, Relays: 41-48