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CAN-bus option

WIENER VME / VME64x / VXI crates of the 5000 and 6000 product families as well as NIM and CAMAC crates with fan tray and PL508 power supplies can be equipped with a CAN-bus interfaces for remote monitoring and control.

The Controller Area Network, (CAN) defined by Bosch in 1985, is an advanced serial multi-master communication protocol. Due to the reliability and technical capability as well as to the available low-price system components, CAN is well suited for application in field bus systems. CAN-bus was chosen as one of the field buses for slow control by CERN LHC.


  • Allows integration of WIENER chassis and power supplies into CAN field-bus system.
  • Up to 126 crates can be controlled within a network. In addition to the remote on/off and SYSRES (VME) the user can control and program remotely every crate parameter via the interface as (* depend on power supply type):
    • Crate Identification
    • All voltages and currents, Over- under voltage trip off points (*)
    • Current limit adjustment to lower levels than 100%, i.e. for module test procedures (*)
    • Temperature measurements of air inlet and above modules (up to 8 sensors for the VME 6000 crate series possible)
    • All status signals, error messages
    • Average speed and individual speed of every single fan
    • Configuration and adjustment (*)
  • The communication between crates and host computer is based on a new intelligent bus protocol (CMS-CAL compatible) characterized by functions like:
    • Automatic error message generation, (highest priority)
    • Minimum level of required bus activities
    • Broadcast and group functions
    • Task dependent priorities, equal rights for all crates

Ordering Information

Standard configurations (others possible by request).

CAN-bus optionCAN-bus option for W-IE-NE-R chassis and power supplies

Technical Information

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