#!/usr/bin/env perl
#
# Modbus/TCP Server query
#
# Issues a read coils request on an IP address / port
# Here is demonstrated the full Modbus transaction API
#
# Cosimo Feb 2st, 2007
#
# $Id: read_coils_full_api.pl,v 1.4 2007/02/16 10:05:22 cosimo Exp $
use strict;
use warnings;
use lib '../blib/lib';
use Protocol::Modbus;
$| = 1;
my $modbus = Protocol::Modbus->new(driver=>'TCP', transport=>'TCP');
# Create transport class
my $trs = Protocol::Modbus::Transport->new(
driver => 'TCP',
address => '192.168.11.99',
port => 502,
timeout => 3,
);
# with explicit method name
my $req = $modbus->readCoilsRequest(
address => 512,
quantity => 10,
);
# Open a new modbus transaction...
my $trn = $modbus->transaction($trs, $req);
while(1)
{
# ... issue the request and get response
my $res = $trn->execute();
my $coils = $res->coils();
print 'Coils status: (', join('', @$coils), ')', "\r";
select(undef, undef, undef, 0.2);
}