RE: Who uses 10kbps and 20kbps with CANopen?

Hi Simon,

I used 10k and 20k bps for my CANRF product but that's only because the On
Off Keying modulation could not support the RF transceiver turning around
any faster than that bit rate.  In fact 433Mhz meant 10kbps and 916Mhz meant
at most 20kbps.  Bitwise arbitration at higher rates would fail because the
receiver would still be saturated from a previous transmitted dominant bit.

Back in 2000, for power line Super CAN our maximum bit rate was 100kbps but
initial testing was done at 20kbps for the arbitration section and then the
data could be modulated at 10Mbps.  Our data part supported a wide variety
of modulation techniques to allow other venders to insert their own protocol
but initially we just used the standard 11898 drivers and ran 2.5Mbps and
data packets up to 2048 bytes.   We carried Ethernet 1550 byte packets
inside the Super CAN messages and transmitted real time live Video along
with standard 11 bit and 29 bit CAN messages.

So 20kbps is really only useful if it's a very noisy environment or a long
distance.

John Dammeyer

"ELS! The Solution"
Automation Artisans Inc.
http://www.autoartisans.com/ELS/
Ph. 1 250 544 4950




-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Bruce
Decker
Sent: April-19-13 6:53 AM
To: [email protected]
Subject: RE: [CANLIST] Who uses 10kbps and 20kbps with CANopen?

Hello Simon,

Rail vehicles use the lower bit rates because of their length. There may be
other uses, but of this use I am certain.

Sincerely,
Bruce Decker

AB Tech Solution
Offshore Pricing
Onshore Convenience
---------------------------

Bruce M. Decker, P. E.
Vice President of Technical Marketing
AB Tech Solution
67 Tyngsboro Road
Westford, MA 01886 USA
Tel. +1 (978) 399-0139
Cell +1 (603) 833-0669
Fax +1 (978) 788-5536
[email protected]
http://AbTechTeam.com
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-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Simon
Byholm
Sent: Friday, April 19, 2013 6:26 AM
To: [email protected]
Subject: [CANLIST] Who uses 10kbps and 20kbps with CANopen?

Hello

We are considering what bitrates to support in a CANopen device to be
mounted on off highway vehicles. Do anyone know if these bitrates are used
in actual systems? If they are, then in what kind of systems are they used?

Thanks in advance for taking the time to answer my question,

Simon

--
Simon Byholm
Software Manager

TK Engineering Oy
P.O. Box 810, FI-65101 Vaasa, Finland
Visiting address: Yrittäjänkatu 15

Phone: +358 6 357 6306
Fax: +358 6 357 6320
email: [email protected]
web: www.tke.fi

TK Engineering solves your CAN, CANopen and J1939 problems by providing the
hardware, software and know-how you need to design, manufacture and
troubleshoot your industrial and heavy machine CAN networks. Call +358 6 357
6300 or email [email protected] to learn how we can help you solve your CAN
related problems.

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