Good Afternoon Monks,

I have a program that uses Win32-Serial and I am sending commands to a receiving decoder which is installed into a model railroad locomotive. Individually the commands work: Ring the bell, blow the horn etc. However, when each command is sent it shuts off the previous command. Below is my code and what I need to be able to do is for example: Lights On stays on even if Bell On is selected. The receiver/decoder does not store commands...it just executes what is sent. 

### LIGHTS ON/OFF CODE###

sub leftefzeroone {
$button53->configure(-text => 'F0 - Left Lights On');
$button53->bind('<ButtonPress>', \&leftefzerotwo);

my $tlightson = "<f 1108 144>";
$port->write($tlightson);
$port->lookclear();
}

sub leftefzerotwo {

$button53->configure(-text => 'F0 - Left Lights Off');
$button53->bind('<ButtonPress>', \&leftefzeroone);

my $tlightsoff = "<f 1108 128>";
$port->write($tlightsoff);
$port->lookclear();
}

### BELL ON/OFF CODE###

sub leftefoneone {
$button54->configure(-text => 'F1 - Left Bell On');
$button54->bind('<ButtonPress>', \&leftefonetwo);

my $tbellon = "<f 1108 136>";
$port->write($tbellon);
$port->lookclear();
}

sub leftefonetwo {

$button54->configure(-text => 'F0 - Left Bell Off');
$button54->bind('<ButtonPress>', \&leftefoneone);

my $tbelloff = "<f 1108 128>";
$port->write($tbelloff);
$port->lookclear();
}

[download]

As you can see from the code the number 128 is the byte number in the receiver/decoder that shuts any function ON to OFF. What I need to implement is a type of IF EXISTS statement. I'm lost as to where to begin on that. I can do simple IF FILE EXISTS type of routines. Thanks in advance!

In reply to Saving Options by PilotinControl

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