command DollaTek LCUS usb relay

usb_relay.sh

#! /bin/bash
stty -F /dev/ttyUSB0 9600

while [[ $# -gt 0 ]]; do
  case $1 in
    --on)
      echo "set on"
      echo -e "\xA0\x01\x01\xA2" > /dev/ttyUSB0
      shift
      ;;
    --off)
      echo "set off"
      echo -e "\xA0\x01\x00\xA1" > /dev/ttyUSB0
      shift
      ;;
    -h|--help)
      echo "usage: $0 [--on|--off]"
      shift
      ;;
    -*|--*)
      echo "Unknown option $1"
      exit 1
      ;;
  esac
done

Amazing, works perfectly for me!