Multiplexing 187
Figure 9-20
CAN bus-based multiplex joystick
NOTE: The PTO can only be turned on when the engine speed is lower than 900 RPM and the air
pressure higher than 90 PSI. It is recommended to raise the engine speed only after the
hydraulic system is engaged.
Labrie’s multiplex system monitors all safety and operating functions to insure they work at their best.
This system transfers data to and from the Allison TCM and the Cummins engine ECU. In order for
this to be possible, proper parameters must be put into the TCM and the ECU. In the next section
you will find tables that contain such parameters.
Allison Transmission Parameters
In Allison transmissions used on automated vehicles, the Transmission Control Module (TCM)
manages several functions:
It prevents the pump from engaging if the engine speed is higher than 900 RPM.
It also controls the auto-neutral system (if so equipped).
The TCM is programmed using the Allison Doc software installed on a laptop computer. Allison Doc
is also necessary to verify if signals are properly reaching the TCM and to verify the fault code, if any.
Figure 9-21
Allison Doc software
If the TCM of your vehicle needs repair or replacement or if it needs specific programming
parameters, see Programmed Parameters below.
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