USB interface relay module. USB adapter plus the relay module.
Can interface with PC over USBdirectly(1). Activated by UART RTS assertion, turn on by invoking any terminal software and turn off by leaving it.

If more robust relay ON/OFF triggering is desired, please consider .  It will change state upon receiving command code instead of a pin state.


Using PL2303H chip. Work with multiple OSs including MS Windows XP.

 
Features:
  • Approximately 0.8m long cable.
  • Four dupond connectors, 2.54mm pitch type. 5V, Rx, RTS and GND. Powered by the USB host.  LV-TTL I/O voltage level.
  • Supports baud rate from 75 to 128000.
  • Intended for working with the relay module.
  • Relay module: 51mm x 25mm x 20mm.
  • TTL 5V high level triggered ON.
  • Power rating: 10A 250VAC, 10A 125VAC;  10A 30VDC; 10A 28VDC.
Package:
  • USB to TTL level adapter. 
  • Single way SPDT relay module.

Remarks: 

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