#!/bin/bash

COMDEV=/dev/ttyS0
stty -F $COMDEV -hupcl -opost -onlcr -isig -iexten -echo -echoe -echok -echoctl -echoke -icanon min 0 time 5

echo -ne "SHUTTERCLOSE?1,1,1,1,1\r" > $COMDEV
cat $COMDEV
echo -e "\n"