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  1. or download this
     
modpoll
-b 4800 #          Baudrate
...
ing (use -c 1 to force FC5 or FC6)
/dev/ttyUSB0
  2. or download this
    my $client = Device::Modbus::RTU::Client->new(
    port     => '/dev/ttyUSB0',
...
 
$client->send_request($req);
my $resp = $client->receive_response;