Multiplexing 205
Replacing the CAN Bus-Based Multiplex Joystick
Should the CAN bus-based multiplex joystick need to be replaced for any reason, it will have to be
replaced with a new joystick of the same kind and same part number in order to insure continued
proper operation of the multiplex system. Do not use other kind of joysticks even if they bear
similarities to the CAN bus-based joystick. For more information on CAN bus-based joystick
replacement, contact LabriePlus.
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 Allison transmission ECU and Cummins engine ECM. In
order for this to be possible, proper parameters must be put into these ECU and ECM. In the next
section you will find tables that contain such parameters.
Allison Transmission Parameters
In Allison transmissions used on automated vehicles, the electronic control unit (ECU) manages
several functions:
It prevents the pump from over speeding (2000 rpm, maximum).
It prevents the pump from engaging if the engine speed is higher than 900 rpm.
It also controls the auto-neutral system (if present).
Programmation of the ECU can be done using the Allison Doc software installed on a laptop
computer. Allison Doc is also necessary to verify if signals are properly reaching the ECU, and to
verify the fault code.
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