Assembly Instructions

Configuration on page 96 and Figure 99: Rear Accessory Connector Data Configuration on page 96,
respectively.
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 three VIP output connections, as follows:
Table 13: VIP Output Connections
VIP OUT
NUMBER
J400 J2 J100
SW B+
Pin Num-
ber
On/Off
Switched
Pin Num-
ber
SW B+
Pin Num-
ber
On/Off
Switched
Pin Num-
ber
SW B+
Pin Num-
ber
On/Off
Switched
Pin Num-
ber
1 Red 1 5 (Blue) 24 18 24 18
2 Red 1 6 (Yellow) 24 19 24 19
3 Red 1 7 (Black) NA NA NA NA
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.
VIP OUT 1 and VIP OUT 2 can be accessed from either J100 or J400 connectors to allow a previously
wired VIP OUT at J2 to move easily to J100. However, when any cable is inserted into J400, J100 VIP
OUTs are disabled.
When installing relays to the VIP OUT lines, a diode is necessary to prevent damage to the transistor
or MOSFET, due to “back EMF” when the field collapses on the relay coil. Some vendor relays already
come with this diode built-in, and other relays require the customer to install it. Figure 94: Relay Coil on
page 91 shows the proper placement of the diode across the relay coil. The transistor or MOSFET is
located inside the radio or the D.E.K. box.
Figure 94: Relay Coil
N.C.
N.O.
Relay
G
D
S
VIPout
SW B+
Note:
To 'activate' a VIPOUT, you have to ground the VIPOUT, such that the
current now flows thru the relay coil to GND through a MOSFET inside
the radio or control head, which causes the relay wiper to toggle. The
MOSFET of a VIPOUT should never be used to directly drive an
accessory. The MOSFET should be used to control an external relay.
Protection
Diode
NOTICE: See Replacement Parts Ordering on page 132 to order relay for your VIP OUT
applications. Example relay hardware: TLN4533_ (relay without internal diode), HLN6969_
(relay with internal back EMF protection diode), and HKN4258_ (relay wiring cable).
MN005720A01-AB
Chapter 4: Options and Accessories Installation
91