CAN bus optical isolation

[PCM programmer]

You can get the Draft 1.11 specification at the link below.
That's what I have. You don't have to request it. Just download it.
http://itcofe.web.cern.ch/itcofe/Services/Fieldbus/CAN/Cabling/documents/DR303-1V111.pdf
It shows the DB-9 and the RJ-45 connectors. That's what I use for CAN.
It also shows several other connectors.

[mike holeton]

Hello All,

I have been using CAN since 1997. As far as I'm concerned, there is no other better or more reliable way to TX/RX messages, at least when we're talking about 1 MHz or less. In an EMC chamber, the twisted pair is emuine to seceptability al the way to 16 GHZ at 200 volts @1 meter. The shielding is only needed for the CAN itself to make sure it does not interfere with other devices. For most, if not all, cases the relatively low frequency won't be an issue.

There are no specified connectors for the CAN, but I have used two types with great success. They are the Amp/Molex 156 style connector with gold plated contacts and the best connector to use is the Deutsch DT or DTM series from Ladd Industries.

In the last 2 years or so, CAN has become the defacto standard for engine, transmission communication and best of all controlling rates, speeds, torques, feedbacks, instrumentation, etc.

I use the CAN (J1939 spec) for all of my corporations control projects and would recommend it to nearly any application, except maybe distances over 1000 meters. (repeaters are needed or special drive curciuts).

[mike holeton]

Please keep in mind that CAN is only the physical layer and is specified as ver1, 1.1 2.0A, and 2.0B.

The common protocols used on CAN are J1939 standard and extended, CAN open (be careful, "open" can mean non compatability issues with other devices),and Device Net just to name a few of them.

The positive to CAN is the low cost and robustness.
The negative is that multi-protocols are available and the software is much harder to write PROPERLY as compared to RS232-485.

[Stoney64]

Hello,
There is also a web site called vector that has the CAN spec
http://www.vector-cantech.com/
Vector sells software and hardware for CAN...It's not cheap.



Stoney