Could this be the solution?
Startup Key Operation
You can setup a Startup Key Configuration so that the scanner can change the
lockout for each system or each site by pressing an assigned key while you power
up the scanner or an opening screen is displayed. Navigate to Set Startup Key
there are differences in the menu structure for Trunked and Conventional systems.
Assign all the systems/sites that you want to scan at the same time to the same
startup key [0] to [9]. You can only assign a site/system to one startup key. To
leave a system unassigned, press [.No].