Use a Webcam for track call:

You can send command to Pc Lap Counter  by using  webcam and a special program who can detect mouvement in different area(s)
I try Web Zone Trigger , this program is perfect because Web Zone Trigger have the possibility to execute a program when a mouvement is detected in a specify area (you can specify more than one area).
In Pc Lap Counter i add a simple program called plc_remote.exe that can be used by Web Zone Trigger to send command to Pc Lap Counter (the program is in the directory c:\Pc Lap Counter).

Here is a description of the command that can be sended to Pc Lap Counter:

Command

Description

START

Start the race

GO

Start the race

RESTART

Restart the race and set power on

CONTINUE

Restart the race and set power on

PAUSE

Pause the race and set power off

STOP

Pause the race and set power off

SPR

Start, Pause , Restart the race against the race state

POWEROFF

Will set power off on all lanes

POWERON

Will set power on on all lanes

Here is a little documentation of  how to set Zone Trigger for track call:

Setup the detection zone:

Action to take when zone is triggered:

Here the program plc_remote will be executed with the command “PAUSE”

To have a perfect detection you need to set some options in the Zone Trigger program:

Result: when there is a change , the cursor go to blue and the “plc_remote.exe” program is executed and
Pc Lap Counter will receive the command “PAUSE” and pause the race.