Absolute encoder GXM7S - RS485

[|JohnC|]

Hi Folks.

Please, I need help with this encoder: http://baumer.amirada.net/pfinder_motion/downloads/Produkte/PDF/Datenblatt/Drehgeber/PI_GXM7S_RS485_...

I have experience with SERIAL comunication, GPIB, I2C, SPI ... but no with FIELD BUS. I can not find/understand how this encoder comunicates with Fieldbus protocol via RS485.

I have PCI-8431/8. It will be able to communicate with this encoder (without any additional software for FieldBus)?

Now I am studying prime common information about Fieldbus Foundation and I am hoping in your help.

Thank you very much.

Best regards

Cagan

[Norbert_B.]

Hi Cagan,

I'm looking into your problem. In the meantime, if you haven't already figured out how it works, here is a neat guide for fieldbus:

http://www.relcominc.com/pdf/501-123%20Fieldbus%20Wiring%20Guide.pdf

If you have a solution, or any new ideas, please post it.

Regards,

Norbert

[|JohnC|]

Hi Norbert.
Thank you very much for your link.
I think, that it is possible use this encoder without additional software for fieldbus. According to section "Data transmission format" in above-mentioned datasheet is possible recognize serial data structure and handle data. It will be simple serial communication, if there will be one encoder conected to one RS485 port... Do not you think?

[Norbert_B.]

Yes, I think it should work. Both the PCI-8431 and the encoder have been designed to communicate via RS485. If you specify the address of the encoder with wires 'Ident 1' and 'Ident 2' and then call the encoder by that address in the 'ADR' field of the 'Demand from master' message, there should be no problem.

Have you made an attempt to communicate with the encoder yet? If yes, what are the experiences?

[|JohnC|]

Hi,
sorry for my lag, i have been waiting for processing of order very long.

I have just finished all work. Everything is working very well.

I have 4 encoders on one port, and second 4 ecnoders on another port.

Master (PCI-8431) works in "Wire2-auto" mode and it corresponds to wiring of encoders of course.

CRC checking works very well too. I am very happy . It was simple task.

I could give any details, if there is somebody who need them.

Regards,
C