The 'PACE-Bus' module 'Call station interface (RS485)' PTO2008-A1 provides a convenient connection to the call stations PT2003-A1 and PT2009-A1.
It routes all signals to a copper Ethernet cable (CAT5) to connect the call stations and further PTO2008-A1.
It provides a fuse to secure the 24 V in the cabinet in case of a short circuit outside of the cabinet.