Cloud Electronics CDPM Range - Manual (Page 11)

CDPM Digital Paging Microphone Setup And Installation Guide
CLOUD ELECTRONICS LIMITED
5
V1 210605
An optional analogue interface is available for the CDPM which can be fitted to a CDPM to enable
connection to a short-to-ground paging system. In order to install the module, the following additional
hardware has been provided:
1x 5-9mm cable gland
2x black self-tapping screws for XLR fixing
4x M3 fixing screws for PCB fixing
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1. Disconnect power from the microphone.
2. Free the display from the base by removing all fixing screws in the bottom and the two M3 screws on
the rear panel. Keep these screws for reassembly.
3. The microphone element should be disconnected from the screw terminals and the ribbon cable at
‘CON3’ should be disconnected.
4. Remove the display metalwork.
5. Remove the blanking plate covering the two circular holes in the rear panel.
6. Fit the module such that the XLR socket fits through the hole marked ‘AUDIO OUT’ on the rear panel.
7. Fix the module to the base using the M3 fixing screws provided.
8. Fit the black self-tapping screws to the XLR socket.
9. Fit the threaded shaft of the cable gland to the hole marked ‘ANALOGUE PORT’ on the rear panel.
Fix this using the sharp edged nut to provide a firm electrical contact.
10. Remove the domed nut and rubber tube from the cable gland, then thread first the domed nut then
the rubber tube onto the cable.
11. Strip back the shield on the signals cable such that once the rubber tube is inserted into the threaded
shaft, the cable shield will be clamped between the rubber tube and the metal of the shaft.
12. Put the cable through the threaded shaft and then insert the rubber tube. Tighten the domed nut to
clamp down on the cable.
13. Connect access cores to their respective access terminals. These are located at either side of the
module and are detailed in diagram 5.3. Connect the ‘0V’ mixer contact to the ‘GND’ terminal and if
you are intending to power the microphone from the mixer, connect the ‘+V’ mixer contact to the
‘PWR’ terminal.
14. Connect the modules ribbon cable to the main board socket ‘CON2’.
15. Reconnect the microphone element. The red core should be connected to the ‘MIC+’ screw terminal,
and the blue/black core should be connected to the ‘MIC-’ screw terminal.
16. Reconnect the display ribbon cable to ‘CON3’.
17. Fix the chassis back on to the base using the screws kept from step 2.
18. Reconnect the power.
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The output of the analogue interface reflects zone selections across the entire system and is not limited
by the number of zones available on the microphone it is contained within E.G. an analogue interface
installed into a CDPM-4 will be able to operate over all 16 network zones if other microphones on the
system require it.
The analogue interface monitors the state of its output, so can detect when the short-to-ground
connections are in use by another microphone. If the short-to-ground contacts are in use, the system is
assumed to be busy. When the short-to-ground contacts are busy, only high priority microphones on the
CDPM network may make an announcement. This allows the short-to-ground interface to be used in
networks which also use other paging equipment such as the CPM-4 and CPM-8.
Only one CDPM in a network will require the analogue interface for the whole network to be connected
to a short-to-ground paging system.