What do I have to do to configure the 01942 GSM communicator in the By-me control unit?

You need to configure the communicator via the BUS button and the control unit menu: Configuration>Communicator Interface Management>Configure. After this operation, you have to remove and restore power to the 01942 GSM communicator and register the device via the menu Configuration>Communicator Interface Management>Interface Authentication. Note: In versions prior to 1.11 the Interface Authentication menu item was called: Telephone Communicator.