WDS P20, Installation And Operation Manual

Page: 17 / 32

13
1. Grounding the Redundant Transceiver Chassis. Connect the rear
panel ground stud to the chassis’ earth grounding system.
2. Installing the antenna. Install the station antenna(s) and feed-
line(s). If a directional antenna is used, preset its heading in the
desired direction.
3. Connecting to the data equipment. Connect the data equipment to
the chassis’
DATA INTERFACE
connector.
Use only the required pins for the application. Do not use a fully
pinned (25 conductor) cable. Typical applications require the use of
Pin 2 (transmit data—TXD), Pin 3 (received data—RXD) and Pin 7
(signal ground). Refer to Figure 9 for a detailed view of the
DATA
INTERFACE
connector.
If hardware flow control is desired, Pin 4 (request to send—RTS)
and Pin 5 (Clear-to-Send—CTS) are also required.
Pin 24 is the Remote Switchover Input. This input can be used to
switch which transceiver is active. A -12 Vdc to +12 Vdc transition
causes the redundant station to switch operation from the currently
active transceiver to the standby transceiver. The front panel radio
selection switch must also be in the
AUTO
position.
An expanded list of pin functions is provided in the transceiver’s
Installation and Operation Manual.
Invisible place holder
Figure 9. Redundant Transceiver Chassis
interface connector pins
As viewed from outside the chassis
4. Connecting to alarms. If alarm equipment (a lamp or sounding
device, for example) will be used with the Redundant Station, make
the appropriate connections to the rear panel
ALARM
terminals.
These are “dry” (isolated) alarm contacts which activate when either
Unused
Unused
Receive Audio Output
13
12
11
10
9
8
7
6
5
4
3
2
1
Receive Unsquelch Sensor
Transmit Audio Input
Data Carrier Detect (DCD)
Signal Ground†
Data Set Ready (DSR)
Clear-to-Send Output (CTS)
Request-to-Send Input (RTS)
Received Data (RXD)†
Transmitted Data (TXD)†
Protective Ground
25
24
23
22
21
20
19
18
17
16
15
14
Alarm Output**
Remote Switchover Input*
Diagnostic Channel Enable**
RSSI Voltage**
9.9 Vdc Regulated Output**
Unregulated DC Output
Unused
PTT VV
Remote RTU Reset VV
PTT VV
P i n
Description
P i n
No.
P i n
No.
P i n
Description
Unused
Future use—Do not connect
† Required in most installations
* Unused in Transceivers
** Not Available in Redundant Stations
V † Not used in 9820