Intellitec
131 Eisenhower Lane North
Lombard, IL 60148
630 268 0010 / 1 800 251 2408
P/N 53-00778-100 Rev. 062003
www.Intellitecsve.com
Intellitec
Application Installation and Trouble Shooting Guide
Mini-Bus Multiplex System
SYSTEM OVERVIEW
The Mini-Bus Multiplex System is a flexible modular
system intended for use in smaller buses with a
limited number of electrical loads. A basic system
contains a Master Module and a Switch Adapter
Module. Additional modules can be added to allow
up to sixteen independent loads to be controlled.
The heart of the system is the Master Module which
provides the “traffic cop” and power distribution
functions of the system.
It includes fusing for 7
loads and solid-state switching for 4 loads. It also
includes a timer to shut off the loads in the event
they are inadvertently left on and low voltage
detection to prevent the loads from running the
battery so low it won’t start the engine.
The Switch Adapter Module is always used with the
Master to complete a basic system. It connects to
the Master Module with three wires. These wires
provide bi-directional multiplex signals, power and
ground.
Other modules include a Door Control, Auxiliary
Heater Fan Control, and Auxiliary Output Modules.
All of these modules connect into the system using
the same wires as the switch panel.
The system communicates between the modules
using Intellitec’s proprietary multiplex scheme. This
particular system uses 16 channels to communicate
between modules.
Some of these channels are
dedicated to basic functions, including the interior
lights, auxiliary loads, heater fan control and door
control. Other channels can be used for auxiliary
functions that may be needed to perform other
functions on the bus. (
)
Multiplexing reduces the number of
wires for the switches from as many as 48 to 3.
MULTIPLEX COMMUNICATIONS
See channel allocation table
on Page 2
THE MASTER MODULE
The power from the battery is connected to the
Master Module and switched there, eliminating the
need for heavy wires at the switches. The Master
Module provides automatic features to help manage
the battery power on the bus.
The Master Module provides the signal that
communicates with all of the modules.
It also
includes power distribution and fusing for all of the
primary system outputs and solid-state switching for
two interior lighting circuits and two auxiliary
outputs.
Connections are
made using Mate-N-Lok connectors.
Fuses for auxiliary outputs 3 thru 8 are located on
the auxiliary output modules.
The Master Module contains a timer for the interior
lights and a low voltage detector to prevent the
interior lighting from running the battery down.
If
the interior light switches are left on, the interior
lights will remain on for up to twenty minutes after
the ignition switch is turned off. If the battery is low
and ignition is off, the lights will go out in two
minutes. This will prevent running the battery down
any further. If the lights have been turned off by a
timer or low voltage condition, the light switch must
be turned off and then on, to recycle the lights for
another time period. If the ignition is on, the timer or
low voltage detector will not affect the lighting
circuits.
If the system is equipped with a door
module, lighting output 1 will turn on when the door
is open. If ignition is off, the lights will turn on for 20
minutes and then go out.
Auxiliary outputs 1 and 2 can be set to turn off by the
timer, just as the lighting circuits do or with ignition
via a dip switch or jumper setting on the switch
adapter.
All other auxiliary outputs will
automatically turn off when the ignition is off.
(See drawing on Page 4)
