11
General Description
Description, Specifications, and Installation Manual
Keep all high-voltage and low-voltage wiring separated. If high-voltage and low-voltage
wiring must be run together, all wiring must have an insulation rating greater than the
maximum circuit voltage.
The relay output connectors accept 14-22 AWG wire. Four dry relay output contacts are
provided with both normally open and normally closed contacts.
Audio Input
The Audio Input is used to detect channel busy audio. The Audio Input detects from
50 mV to 500 mV
p-p
.
Table 3 Audio Input
Terminal Description
1 and 2
Input from radio to indicate when radio is in use.
Radio and Audio PTT Outputs
The I-IPSIU has two SPDT relays rated at 5 A at 30 Vdc.
The relays are preset to activate when a voice message is initiated. These relays are used
to active the push-to-talk (PTT) on the radio equipment.
Audio Out/Adjust
The audio output level is adjustable from 0 to 2.5 V
p-p
into 600 ohms with 1 kHz tone.
A removable eight-position connector is located on the rear of the I-IPSIU for making
electrical connections. The connector accepts 5 mm (3/16 in) stripped wire, 18-26 AWG.
Make electrical connections to the Input/Output connector as follows.
Table 4 JP3 Radio and Audio PTT Outputs
JP3 Terminal (Field Wiring)
1 – Audio Out
2 – Audio Out
3 – Normally open, relay #1
4 – Common, relay #1
5 – Normally closed, relay #1
6 – Normally open, relay #2
7 – Common, relay #2
8 – Normally closed, relay #2
Radio Connections
Use Tables 2, 3 and 4 to interface to the radio system or other external broadcast systems.
Use Table 5 to interface between the I-IPSIU and radio. The Universal Adapter Cable
provides flying leads on one end and a DB9 connector on the other. The DB9 connector
interfaces to a second cable which provides the interface to the radio.
