Re: Tips for implementing the LSS service in CANOpen.

From: Heinz-Jürgen Oertel (hj.oertel_at_surfeu.de)
Date: 03/14/05 

Date: Mon, 14 Mar 2005 22:20:59 +0100

John wrote:

> I'm in the process of implementing the CANOpen LSS service and I've hit
> a road block. I had assumed that all nodes could be in configuration
> mode when using the service "Identify Remote Slave (5.6.1 of LSS
> spec)," but apperantly according to the LSS spec, "there must be only
> one LSS slave at a time that communicates with the LSS master."
>
> So if I'm an LSS Master and I don't know the nodes identification info
> (vendor id, product code, rev number and serial number), how do I
> assign the node a valid node id? I was hoping to use the Identify
> Remote Slave Service to search the CAN bus and identify who is out
> there, but if only 1 node can be in configuration mode for that command
> to work then I can't use that command.
>
> How do I go about using the LSS services to implement an LSS Master?
>
> Any help is apprecieated.
>
> Thanks,
> John.

If a CANopen node supports the LSS services and has no node-id assigned yet
it stays in the configuration mode until the LSS master assigns an id to
it. There should be no problem for the search, besides it is time consuming
without any pre-assumptions. E.g. you should use for special devices of a
special manufacturer to assign this devices special node-id's. And even
than, which limit switch found is on the left, which one on the right side
of a machine?

Regards
 Heinz
  

-- 
with best regards / mit freundlichen Grüßen
   Heinz-Jürgen Oertel
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