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CANOpen LSS question

Discussion in 'Embedded' started by Martin Czamai, Aug 13, 2003.

  1. Hi,

    I've a (simple) question about the COB-ID used for LSS in CANOpen:
    Any transmission/reception is done by using the COB-ID 2021/2020 and
    as far I've understood, the COB-ID represents the CAN-ID on the bus.
    Since CANOpen uses standard frames only, how are those IDs mapped to
    the CAN-ID?? (2020 == 0x7E4 which is > 0x3FF)
    Another quesiton that occured when reading the "layer setting services
    and protocoll (LSS)" document available from CiA is about switching
    the mode of a single slave node back to operational mode. On page 9 of
    the document, switch mode selective takes only the LSS_address of the
    slave to switch to configuration mode, is there no way back to
    operational mode?
    What happenes if multiple slave nodes are configured to the same,
    invalid ID? (those nodes should be dynamically reconfigured to a valid
    node ID at startup)
    Thanks for any help,

    Martin Czamai, Aug 13, 2003
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  2. Hi Martin,
    First of all, there is a special CAN oriented mailing list at
    <http://www.canlist.org/> and a Wiki forum at
    Your question regarding the LSS CAN-ID used is easy. Standard frames, or
    newly called base frame format, are 11 bit, the range is 2^11 = 2048. IDs
    from 0 to 2047 are allowed. 2020 and 2021 are in the range. I don't have
    the standard at hand, but there should be a way back from the configuration

    with best regards / mit freundlichen Grüßen

    Heinz-Jürgen Oertel
    | Heinz-Jürgen Oertel port GmbH http://www.port.de
    | mailto:
    | phone +49 345 77755-0 fax +49 345 77755-20
    | Regensburger Str. 7b, D-06132 Halle/Saale, Germany
    | CAN Wiki http://www.port.de/cgi-bin/CAN
    | Newsletter: http://www.port.de/engl/company/content/abo_form.html
    =?ISO-8859-15?Q?Heinz=2DJ=FCrgen?= Oertel, Aug 13, 2003
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