Chapter 3 Options and Accessories Installation
3.1 VIP Overview
The vehicle interface port (VIP) allows the control head to operate outside circuits and to receive
inputs from outside the control head. There are three VIP outputs which are used for relay control.
There are also three VIP inputs which accept inputs from switches.
3.1.1 VIP Output Connections
The VIP output pins are on the back or the rear of the accessory panel (J2). The pin information is
shown in Figure 3-6. Use these connections to wire control relays. One end of the relay should
connect to switched B+ voltage, while the other side connects to a software controlled ON/OFF
switch inside the control head. The relay can be normally on or normally off depending on the
configuration of the VIP outputs. There are two VIP output connections, as follows:
The function of these VIP outputs can be field programmed in the control head. Typical applications
for VIP outputs are external horn/lights alarm and horn ring transfer relay control. For further
information on VIP outputs, see the control head programming manual.
Table 3-1. VIP Output Connections
J2
VIP Number
SW B+ Pin
Number
On/Off
Switched
Pin Number
12418
22419
CAUTION: XTL 1500 radios equipped with the following features
are capable of transmitting automatically, even if the radio is turned
off:
• MDC Status/Message
• MDC Emergency
• Trunking Products
• Automatic Vehicle Location
• Other Special Data Products
All XTL 1500 have accessory connector pins 14 and 15 connected
together to allow the radio to power down. Opening this connection
by REMOVING the accessory connector, or otherwise failing to
maintain a normally closed path, could, if left unchecked, drain the
vehicle battery, and possibly cause transmissions to occur.
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