User's Manual

RPE 673
TM 1184 Issue 1 AL1 (May 1997)Page A1 - 14
Audio Connection
30. If required, the audio output from the External Device should be connected to Serial
Encoder SK1 using the 2-Way Socket, Part No. 4501-0001 (provided) and suitable cable
(RV1 on the Encoder PCB may be adjusted to compensate for the output level provided
by the audio source at the customer’s premises).
Direct Line Contacts (DLCs)
31. DLCs can be a door bell push, a security alarm, a sensor on a piece of machinery etc.
Contacts must close to initiate a paging call and should be connected to the Serial
Encoder by a twisted-pair wire.
32. The loop resistance of each DLC connection must not exceed 150 S.
33. DLC connections are listed in Table 4. Return connections are made to 0V on SK4
(pin1 or pin 2) of the Encoder PCB.
Table 4: DLC Connections
SK3 SK5
Pin 1 DLC 1 Pin 1 DLC 5
Pin 2 DLC 2 Pin 2 DLC 6
Pin 3 DLC 3 Pin 3 DLC 7
Pin 4 DLC 4 Pin 4 DLC 8
34. Remove the Interconnect Cable 4404-0003 and re-fit the flexi-cable to PL1 of Transmitter
and Encoder. Replace and secure the cover.
Antenna
35. Following the manufacturer’s instructions, connect the antenna to SK4.
36. If using the Whip Antenna, stand the antenna on a flat surface and lay the connecting
lead as straight as possible to the Serial Encoder. The best transmission will be
achieved with the antenna as high as possible and preferably stood on a metal surface
such as a filing cabinet. This will achieve a good ground-plane.