© 2018 Pierce Manufacturing Inc. All Rights Reserved.
Electrical / 6-15
MAINTENANCE
6-14.2 Multiplex System Principals of Operation
Figure 6-5: Pierce Multiplex System Operation
POM0113
NOTE:
The Command Zone™ Information Center (CZIC) also has switch input capabilities.
The functionality of a simple multiplex system is explained in the following paragraphs. While the system shown here
has a single Input/Output (I/O) Module and Power Module, typical vehicles have several modules located in various
places on the truck.
6-14.3 Troubleshooting Tips
Because of significant differences between traditional electrical systems and the multiplex system, different tools
and skills are required to troubleshoot multiplexing faults.
Step 1
The operator activates a switch (rocker or membrane) for a specific function. This information is
received by the I/O Module, which transfers this information to the Control Module via the data link.
Step 2
The change in switch position information is received by the Control Module, which interprets the
information and verifies that all necessary interlocks have been satisfied (if applicable).
Step 3
The Control Module then sends an indicator light activation message (via the data link) back to the
I/O Module, which then causes the I/O Module to turn on the indicator light located on the switch.
Step 4
At the same time the indicator light information is processed, the Control Module determines which
Power Module output should be turned on and sends that information via the data link.
Step 5
The power module - which is constantly monitoring the information on the data link - interprets the
Control Module information and grounds the appropriate output pin location on the Power Module,
which in turn activates the device.
Make sure you are properly trained before attempting to service a multiplex system.
I/O
MODULE
CONTROL
MODULE
SWITCH
Data Link
Cable
Switch Input
Digital Output
POWER
MODULE
Data Link
Cable
Device Being
Controlled
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