Hello @Solo,
The Honeywell system has a different communication protocol than the DSC system such that it would require modification of almost all java classes in the binding. When I added support for the IT-100 serial adapter the similarities in protocols (almost identical) only required the addition of a serial interface and a few changes where there were differences in the command set. The Honeywell protocol has a vastly different protocol format than that of the DSC alarm. To accommodate the difference, changes would need to be made in areas such as the initial configuration of the binding, the login requirements for the Honeywell system, the sending and receiving mechanisms, the cross referencing of commands/messages to openHAB items, and a rewrite of the internal API classes and methods. Probably the only thing that would not change would be the TCP interface with the Envisalink as this is the same. In my opinion I would probably start from scratch by creating a new Honeywell Alarm binding using various other bindings, such as the DSC Alarm binding, as references. I hope this helps.