Catching Driver-specific Commands

Catching Driver-specific Commands

Hi
I'm trying to send a abritrary command to my driver through Zenon. Im trying to use:
Function->Variable->Driver Commands->Driver-specific command
But how do I react to the command in the driver? At the moment I get:
verknüpfte Funktion existiert nicht (z.B: die mit einem Button verknüpfte Funktion wurde gelöscht)
(I havnt written any code to catch it) Can you point me to any documentation?

This is a migrated post! Originally posted on 22.04.2013 by user brc. Please be aware that information can be outdated.