Motor Signal Multiplexer


Motor Signal Mulitplexer

The Motor Signal Multiplexer - in short MoSiMux - is an electrical switch matrix that distributes 14 signals in 8 groups on 12 outputs. The solution consists of the matrix-box in hardware and matching software.


System design



Usually switching between different engine types with different ECUs and different CAN-participants on a test bench requires a switch of the engine diagnostics system and the wiring, both source of errors leading to a malfunctioning test setup. MoSiMux is a system we developed to completely automate the switch of engine types to increase process reliability.

Hardware MoSiMux Matrix Box

The Matrix-Box is a 19" unit of 2 HU and the following features:

  • Distribution of the ECU's data link (5x CAN, 2x K-Line, throttle) in any configuration on all 12 outputs
  • Switchable distribution of the on-board voltage (Pin 15/30/31/50) on all 12 outputs
  • Switching of all signals via relais
  • Permanent 12V supply on all outputs to power engine calibration systems (ES590, Part Y, MCS4, ...)
  • Measurement of voltage and current on pin 15, 30 and 50
  • Protection of all data links (CAN, K-Line, throttle) via self-resetting fuses
  • Protection of on-bord voltage via digital current monitoring with load throw-off in case of overcurrent
  • modular design, thus change of individual modules possible in case of need
  • Alphanumeric display of four rows
  • Remote control via RS232 or USB-interface via the MoSiMux software

Schematic diagram MoSiMux Matrix-Box:

 Mosimux Schaltung

The signals CAN1-5, K-Line and throttle consist of two connections each; pin 15/30/50 of 3 each. They can only be switched in pairs.

Software MoSiMux

The MoSiMux software connects the PC running the automation system, the diagnostics-PC running the engine application system and the matrix-box. The user interface on both PCs is identical, thus virtually eliminating the need for using the diagnostics-PC.

The software deals with the following tasks:

  • Connection between both PCs
  • Start of the correct engine calibration system according to the request of the automation system
  • Display of the current state of all software-components
  • Transfer of information about engine-type, injector-classes, variation-codes, etc. from automation system to engine calibration system
  • Display of measurement values of current and voltage of pin 15/30/50


Asynchronous machines

BETA Dyn supplies asynchronous machines for use in both, engine and vehicle test benches. We deliver a complete system including motor, frequency converter, torque measuring device, cables and accessories.


Vehicle test benches

We deliver customer specific vehicle test benches of different types and sizes.



We swap all components of your test bench to a thought-out overall, state of the art solution.


Preventive service

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