NAME

Device::Modbus::RTU::Client - Perl client for Modbus RTU communications

SYNOPSIS

 #! /usr/bin/env perl

 use Device::Modbus::RTU::Client;
 use strict;
 use warnings;
 use v5.10;
 
 my $client = Device::Modbus::RTU::Client->new(
    port     => '/dev/ttyUSB0',
    baudrate => 19200,
    parity   => 'none',
 );
 
 my $req = $client->read_holding_registers(
    unit     => 4,
    address  => 0,
    quantity => 2,
 );

 $client->send_request($req);
 my $resp = $client->receive_response;
 
 $client->disconnect;

DESCRIPTION

This module is part of Device::Modbus::RTU, a distribution which implements the Modbus RTU protocol on top of Device::Modbus.

Device::Modbus::RTU::Client inherits from Device::Modbus::Client, and adds the capability of communicating via the serial port. As such, Device::Modbus::RTU::Client implements the constructor only. Please see Device::Modbus::Client for most of the documentation.

METHODS

new

This method opens the serial port to communicate using the Modbus RTU protocol. It takes the following arguments:

port

The serial port to open.

baudrate

A valid baud rate. Defaults to 9600 bps.

databits

An integer from 5 to 8. Defaults to 8.

parity

Either 'even', 'odd' or 'none'. Defaults to 'none'.

stopbits

1 or 2. Defaults to 1.

timeout

Defaults to 10 (seconds).

disconnect

This method closes the serial port:

 $client->disconnect;

SEE ALSO

Most of the functionality is described in Device::Modbus::Client.

Other distributions

These are other implementations of Modbus in Perl which may be well suited for your application: Protocol::Modbus, MBclient, mbserverd.

GITHUB REPOSITORY

You can find the repository of this distribution in GitHub.

AUTHOR

Julio Fraire, <julio.fraire@gmail.com>

COPYRIGHT AND LICENSE

Copyright (C) 2015 by Julio Fraire This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.14.2 or, at your option, any later version of Perl 5 you may have available.