June 15, 2005 6815854H01-A
2-4 Product Overview: Control-Head Assembly
2.3.4 Vehicle Interface Ports
The Vehicle Interface Ports (VIPs) allow the control head to activate external circuits and receive
inputs from the outside world. In general, VIP outputs are used for relay control. See the cable kit
section for typical connections of VIP output relays.
In the XTL 1500 dash-mount configuration (Figure 2-1), only two VIP output pins are available, and
they are located at the 26-pin accessory connector, J2-18 and J2-19. There are two VIP outputs for
the XTL 1500 control head. The VIP outputs are normally at SWB+ levels and are driven low by logic
within the control head. Field programming of the radio can define the functions of these pins. The
output MOSFETs that drive the VIP outputs can sink 300 mA of current and are primarily used to
control external relays. These relays should be connected between the respective VIP output pin
and switched B+. The relay can be normally ON or normally OFF depending on the configuration of
the VIP outputs. The CPS can be used to program the function of these VIP outputs in the radio.
The following are typical applications currently supported with ASTRO products:
• Horn relay
• Light relay
• Siren horn transfer
Figure 2-1. VIP Dash-Mount Configuration
OMAP
Processor
SSI data lines
toggle VIP-
OUT
hardware
inside the
Control Head
Microprocessor
Main Board
(Radio)
Pin 19
Pin 18
VIP OUT 1
VIP OUT 2
No Connect
Control
Head
Pin 52
Pin 54
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