
HD Link Installation & Operation Manual
Section 3 – Installation & Wiring
Version 2, April 2010
3-6
Harris Corporation
Intraplex Products
Table 3-7. Transmitter RJ-45 MAIN/ALT Pin Connections
Connector
Pin
Description
1
Unused
2
Ground/Shield
3
Input #1
4
Input #2 (Rx mute control)
5
Output #1 (Major alarm status)
6
Output #2
7
Ground/Shield
8
15 VDC
The outputs and inputs on the MAIN/ALT connector are TTL-level compatible. The output signals are
normally TTL-level low. Use Figure 3-2 and Tables 3-1 through 3-6 as references for these redundancy
connection procedures.
3.4.1
Redundant Transmitters
HD Link transmitters connect through an external Main/Alt controller using these controller
connectors:
●
A
●
A RF-IN
●
B
●
B RF-IN
Therefore, this procedure refers to the transmitters as “Transmitter A” and “Transmitter B.” Perform
these steps to connect your transmitters to the controller:
1.
Plug a straight-pinned 8-connector RJ-45 cable into the MAIN/ALT connector of Transmitter A.
2.
Plug the other end of the RJ-45 cable into the controller’s A connector.
3.
Plug the Antenna cable of Transmitter A into the controller’s A RF-IN connector.
4.
Plug a straight-pinned 8-connector RJ-45 cable into the MAIN/ALT connector of Transmitter B.
5.
Plug the other end of the RJ-45 cable into the controller’s B connector.
6.
Plug the Antenna cable of Transmitter B into the controller’s B RF-IN connector.
Note:
Make sure that the A and A RF-IN cables connect the controller to
only one
transmitter
(Transmitter A) and that the B and B RF-IN cables connect the controller to
the other
transmitter (Transmitter B).
3.4.2
Redundant Receivers
HD Link receivers can either interconnect using a special cable, or they can connect through an
external controller that determines which receiver is on Active and which is on Standby. To
interconnect the receivers, perform these steps. (To distinguish between the receivers, this procedure
refers to “Receiver A” and “Receiver B.”)
1.
Plug a DB-26 pin cable into the EXTERNAL I/O connector on Receiver A.
2.
Plug the other end of the DB-26 cable into the Broadcast tools audio switcher.
3.
Plug one end of the provided crossover wire cable into the MAIN/ALT connector on Receiver A.
4.
Plug the other end of the crossover wire cable into the MAIN/ALT connector on Receiver B.