1. cat /dev/ttyUSB0&amp
2. stty -F /dev/ttyUSB0 300 -parodd cs7 -cstopb parenb -ixoff -crtscts -hupcl -ixon -opost -onlcr -isig -icanon -iexten -echo -echoe -echoctl -echoke
3. echo -n -e '\x2F\x3F\x21\x0D\x0A' > /dev/ttyUSB0
4. echo -n -e '\x06\x30\x30\x30\x0D\x0A' > /dev/ttyUSB0

##</code><code>##

/LOG4LK13BD202015
C.1.0(06091772)
0.0.0(001LOG0006091772)
F.F(0000)
1.8.0(021183.342*kWh)
C.7.1(00000000)
C.7.2(00000001)
C.7.3(00000002)
0.2.1(ver.02, 150228, 671A)
C.2.1(1510121019)
C.2.9(1510121019)

##</code><code>##

open( com, "+&lt;","/dev/ttyUSB0" ) || die "Cannot open serial port : $!\n";
my $raw = "\x2F\x3F\x21\x0D\x0A";
print com $raw;
my $raw = "\x06\x30\x30\x30\x0D\x0A";
print com $raw;

while( 1 )
{
    my $in = <com&gt;; 
    print "$in\n";
}

##</code><code>##

/?!
000
/LOG4LK13BD202015