May 25, 2005 6881096C74-B
2-2 Product Overview: Control-Head Assembly
2.3 Control-Head Assembly
This section discusses the basic operation and components of each control-head assembly.
2.3.1 Display, Vacuum Fluorescent Display Driver, Vacuum Fluorescent Voltage
Source, Controls and Indicators, Status LEDs and Backlight LEDs
For information on the above, please refer to:
• W3 Control Head User’s Guide, 6881096C67 and
• W4, W5, W7 and W9 Control Heads User’s Guide, 6881096C68.
2.3.2 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, and VIP inputs
accept inputs from external switches. The VIP IN and VIP OUT lines move as the configuration
changes from Dash, to Remote, to Remote plus DEK. See the cable kit section for typical
connections of VIP input switches and VIP output relays.
2.3.2.1 Dash-Mount Control-Head Configuration (Mid Power Only)
In the 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. VIP input lines are not available in this
configuration.
Figure 2-1. VIP Dash-Mount Configuration
2.3.2.2 Remote-Mount Standard Control-Head Configuration
Once the radio is put into a remote-mount configuration (Figure 2-2 on page 2-3), the two VIP output
pins located at the rear connector (J2) stop functioning, and the VIP output pins located on the back
of the control head below the area labeled "VIP" become the new VIP output pins. These
connections are used to control relays, just as in the dash-mount configuration. One end of the relay
should be connected to SWB+, while the other side is connected to VIP IN or VIP OUT pins (these
pins are software-controlled on/off switches via transistors inside the control head or on the
interconnect board).
Pin 18
Pin 19
Pin 11
Pin 12
Pin 18
Pin 19
VIP OUT 1
VIP OUT 2
Control
Head
Main Board
(Radio)
U1
MC68HC
MAEPF-27921-O
No connect
MicroprocessorSIOIC
SB9600 data
lines toggle
VIP-OUT
hadware
inside the
Control Head
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