Interfacing Pearl & Pearl2

We have several GRID-recorders and a Pearl to record video, they all where controlled by an application.
This application started recorders, got thumbnails every few seconds and when recording was stopped, it downloaded the recorded video from the grid/pearl to a server.

The Pearl is broken, so we bought a Pearl2. Now we have the problem that the application does not work with the Pearl2. Does anyone know of a command interface change?
I can image that the nr of commands where extended, but the old command structure changed!

For the most part the RS232 and HTTP APIs have not changed very much, but of course as new features/functions are changed, so do the API commands.
The APIs are fully documented here: