Paging Console
Owner‘s Manual 19
4 Appendix
4.1 Key labeling
Labeling the keys of paging consoles is done using label-strips.
The label-strips are inserted from top. Therefore, you have to detach the correspondent top cover at the
left side using a screw driver. Put the label-strip into the open label area and reattach the top cover.
4.2 CAN Bus principles
The network topology used by the CAN bus is based on the so-called “bus or line topology”, i.e. all
participants are connected via a single two-wire cable (Twisted-Pair cable, shielded or unshielded) with the
cabling running from one participant on the bus to the next, allowing unlimited communication among all
devices. In general, it does not matter if the bus member is a paging console, a DPM 8016 or another
device. Thus, the paging console can be connected at any place of the CAN bus.
The CAN bus has to be terminated with a 120 ohms terminating resistor at both ends. If the termination is
missing or an improper resistor value is used, network errors can occur as a signal is reflected on the bus
at both bus ends. Because of the superposition of the reflection with the original signal, the original signal
is blurred. This may result in the loss of data. In order to prevent or minimize reflections at the bus ends,
terminators are used as they "absorb" the energy of the signal.
Since the CAN interfaces of all EVI Audio appliances are galvanically separated from the rest of the
circuitry, network cabling also carries a common ground conductor (CAN_GND) ensuring that all CAN
interfaces in the network are connected to a common ground potential.
4.3 Paging console extension
Up to five paging console extensions DPC 8120 can be connected to a paging console DPC 8015. The
paging console extension provides 20 freely programmable function or zone keys having a green and
yellow LED each. Paging console extensions are employed whenever a higher amount than 15 lines need
to be accessed or when an installation‘s requirement of group and special function keys exceeds the
existing amount of selection keys. Key labeling is done identically to the paging console. Even with
