#!/usr/bin/perl -w

#
# Connection class for Lab::Bus::MODBUS_RS232
#
package Lab::Connection::MODBUS_RS232;
our $VERSION = '3.10';

use strict;
use Scalar::Util qw(weaken);
use Time::HiRes qw (usleep sleep);
use Lab::Exception;

our @ISA = ("Lab::Connection");

our %fields = (
	bus_class => 'Lab::Bus::MODBUS_RS232',
	wait_status=>0, # sec;
	wait_query=>10e-6, # sec;
	read_length=>1000, # bytes
);


sub new {
	my $proto = shift;
	my $class = ref($proto) || $proto;
	my $self = $class->SUPER::new(@_); # getting fields and _permitted from parent class
	$self->${\(__PACKAGE__.'::_construct')}(__PACKAGE__);

	return $self;
}


# this does not really make sense for MODBUS, as there are no "commands" and "responses"
# disable for the time being
# maybe makes sense: write value to one address, wait, read from another address.
sub Query {
	my $self=shift;
	my $options=undef;
	if (ref $_[0] eq 'HASH') { $options=shift }
	else { $options={@_} }

	warn "Query is not implemented (and makes no sense) for MODBUS connections. Use Read. Ignoring.\n";
	return undef;
}



# 	return undef unless $self->slave_address($self->config()->{'slave_address'});
# 	# check the configuration hash for a valid bus object or bus type, and set the bus
# 	if( defined($self->config()->{'Bus'}) ) {
# 		if($self->_checkbus($self->config()->{'Bus'})) {
# 			$self->Bus($self->config()->{'Bus'});
# 		}
# 		else { 
# 			warn('Given Bus not supported');
# 			return undef;
# 		}
# 	}
# 	else {
# 		if($self->_checkbus($self->config()->{'ConnType'})) {
# 			my $ConnType = $self->config()->{'ConnType'};
# 			my $Port = $self->config()->{'Port'};
# 			my $slave_address = $self->config()->{'slave_address'};
# 			my $Interface = "";
# 			if($ConnType eq 'MODBUS_RS232') {
# 				$self->config()->{'Interface'} = 'RS232';
# 				$self->Bus(new Lab::Bus::MODBUS_RS232( $self->config() )) || croak('Failed to create bus');
# 				#$self->Bus(eval("new Lab::Bus::$ConnType( $self->config() )")) || croak('Failed to create bus');
# 			}
# 			else {
# 				warn('Only RS232 bus type supported for now!\n');
# 				return undef;
# 			 }
# 		}
# 		else {
# 			warn('Given Bus Type not supported');
# 			return undef;
# 		}
# 	}




#
# Nothing to do, Read, Write, Query from Lab::Connection are sufficient.
#


=pod

=encoding utf-8

=head1 NAME

Lab::Connection::MODBUS_RS232 - connection class for Lab::Bus::MODBUS_RS232

=head1 CAVEATS/BUGS

Probably few. Mostly because there's not a lot to be done here. Please report.

=head1 SEE ALSO

=over 4

=item * L<Lab::Connection>

=item * L<Lab::Bus::MODBUS_RS232>

=back

=head1 AUTHOR/COPYRIGHT

 Copyright 2011      Florian Olbrich

This library is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.

=cut

1;