topic Re: BiSS Serial Protocol in LabVIEW

BiSS Serial Protocol

bmann2000 — Fri, 05 Jun 2009 11:20:29 GMT

Does anyone have any experience to share on the BiSS Serial Protocol ? I'm considering interfacing to a BiSS encoder using sbRIO.

Re: BiSS Serial Protocol

Mark M — Mon, 08 Jun 2009 13:41:23 GMT

Hi,

I hope you are well.

Do you have any more specific question?

Re: BiSS Serial Protocol

bmann2000 — Mon, 08 Jun 2009 13:48:09 GMT

I'm interested to know if anyone has BiSS FPGA G-Code to share. www.biss-interface.com

It's an open-source protocol, so I figure someone may have posted G-Code for this application. I'm also interested to hear of others overall experience of BiSS, limitations, advantages etc...

Re: BiSS Serial Protocol

alexBC — Thu, 05 Nov 2009 12:25:23 GMT

bmann2000,

I will get a BISS encoder next week and I intend to get the readings from the encoder by implementing a small portion of the protocol stack directly in G-Code.

Did you get additional feedback which you could share or have you already started with some type of implementation? Thanks

Alex

Re: BiSS Serial Protocol

bmann2000 — Fri, 06 Nov 2009 09:40:32 GMT

Hi Alex, I eventually found a BiSS interface adapter from iC-Haus, it was £140 and iC-Haus have supplied LabVIEW drivers, I'm hoping it will be plug and play. I've not started working with it yet, so I can't say how the drivers have been. Here are the drivers. http://www.ichaus.de/ftp/download/brianmann.zip

I bought the adapter from James Filmer, Product Manager, Semicom Visual Ltd, 44(0)1279 770400 www.semicom.co.uk Beware, the power supply for the adapter comes with a German 2-pin plug, so you'll need a travel adapter.

I also found this product from addi-data, it's a multi channel solution:

http://www.addi-data.com/wEnglisch/redirect.php?http://www.addi-data.com/wEnglisch/produkte/pci_express_boards/apcie-1711.php?navid=78

Re: BiSS Serial Protocol

alexBC — Fri, 06 Nov 2009 10:02:33 GMT

Thanks for your help, but this will not give me a native cRio-FPGA solution. I need this because I am running a 50kHz Feedback Control Loop inside the FPGA and the position must be read with that speed.

Re: BiSS Serial Protocol

bmann2000 — Fri, 06 Nov 2009 10:14:23 GMT

I've not actually looked at the drivers yet. I'm targeting sbRIO, FPGA commutating motor (field orientated control) with incremental encoder 50kHz, closing a rate loop with FPGA, then a position loop with BiSS encoder feedback using the processor 2kHz. I may have to implement FPGA BiSS comms too, looks like you'll get there first.

Re: BiSS Serial Protocol

bmann2000 — Mon, 22 Feb 2010 10:16:11 GMT

Hi Alex, I starting on the BiSS interface to my Renishaw encoder this week, so far I've successfully configured the IC-Haus adapter, it's reading out 28-bits without any problem. Next step is creating FPGA code to interface the Renishaw with a sbRIO. Have you made any progress in creating this interface?

Re: BiSS Serial Protocol

alexBC — Tue, 23 Feb 2010 10:33:17 GMT

Yes, I am reading out the angular position at a clock rate of about 100 kHz. You need a RS 422 driver, I am using a "DS 8921N" . The FPGA code takes very little space and coding was not very complicated because of similarities with the SPI Protocol. I am hesitating to post the code here because of patent and license issues, I am not sure if I am allowed to do that.

Re: BiSS Serial Protocol

bmann2000 — Tue, 23 Feb 2010 11:11:07 GMT

Hi Alex, thanks for the note on the driver chip. I have similar code for serial comms I can use to get started, if I'm struggling I'll post my code here and maybe you can point out where I've gone wrong. 100kHz with minimal gates is a result.

Re: BiSS Serial Protocol

alexBC — Tue, 23 Feb 2010 12:05:18 GMT

Bmann, maybe this is trivial to you, but make sure that you feed the RS422 driver from one of the sbRio 5V pin, otherwise you will get erratic data loss due to problems with the digital reference level.

Re: BiSS Serial Protocol

bmann2000 — Thu, 01 Jul 2010 13:08:57 GMT

To communicate with the Renishaw read-head, I got the VHDL IP from BiSS for free (Marko.Hepp@ichaus.de), I've targeted this to the sbRIO using IP Integration Node. Not tested yet as I've to finish building the 422 driver board.

Re: BiSS Serial Protocol

jbevan — Mon, 12 Jul 2010 07:36:31 GMT

alexBC and bmann2000

My name is James Bevan and I am the Resolute Application Engineer at Renishaw. I would be very interested in the work you are doing with the BiSS-C interface and the Renishaw encoder.

My email address is james.bevan@renishaw.com please contact me to discuss your project/application.

Re: BiSS Serial Protocol

bmann2000 — Wed, 17 Nov 2010 10:39:48 GMT

It was not possible to use the IC-Haus supplied BiSS IP (VHDL) with the LabVIEW IP Integration Node. The supplied BiSS IP used a series of VHDL files in a format not compatible with IP Integration Node. Engineers at NI and Renishaw are aware of the end goal, I understand NI were doing some work with the Renishaw BiSS interface. A plug-and-play solution may become available in the future. Renishaw/NI are aiming to provide suitable IP to NI developers who are thinking of specifying a Renishaw encoder in their design.

Re: BiSS Serial Protocol

grivilla — Fri, 04 Mar 2011 14:14:58 GMT

Hello there,

We also need an interface to the resolute absolute encoders using NI-FPGA devices. Please tell me if you hear anything new about it.

Thank you very much

Re: BiSS Serial Protocol

PaulieQ — Mon, 07 Mar 2011 11:21:21 GMT

Hi,

The BiSS-C interface that can be found in the resolute encoder is a basic one (unidirectional).

If you already have a SSI code you can easily adapt it to fit for BiSS-C. You simply have to add one additional bit at the begining (is all the time 0 for unidirectional) and a CRC code at the end. For test purposes you can even ignore CRC bits, but you still have to read them.

If you have a NI bord you can write a short VI that sends a clock. For one frame you need: 1 x start + 1 x "0" (unidirectional) + 24 x data + 5 x CRC + 1 x CDM -> more than 30 bits (Please check the 24 and 5. I don't remeber very well what are the values for resolute). You can send more clocks if you are not sure. A timeout will occur if you send more bits than necessary.

Try not to read the entire Biss documentation. You'll get lost in it. One needs less than 1% from the hundreds of pages from the official website.As I said, start from a SSI and add one bit at the begining and CRC. This is everything.

I hope it helps.

Paulie

Re: BiSS Serial Protocol

bmann2000 — Mon, 07 Mar 2011 11:27:32 GMT

Please keep requesting a NI compatible driver from Renishaw, they're going to have to oblige soon, they know they'll sell more encoders if they provide a driver.

Re: BiSS Serial Protocol

grivilla — Mon, 07 Mar 2011 11:46:24 GMT

Thank you very much for the information. Unfortunately I won’t have the time to test it.

According with NI-Support Germany, NI does not speak about new developments, so no idea whether NI will provide a solution soon or late or never.

Thanks again.

Re: BiSS Serial Protocol

bmann2000 — Mon, 23 May 2011 12:28:51 GMT

note that Renishaw associate company RLS now have the E201-9S available. May be useful for early integration tasks. It's a SSi to USB convertor.

http://www.rls.si/default.asp?prod=e201&utm_content=789517&utm_campaign=Monthly+Encoder+email+-+May+2011&utm_medium=email&utm_source=Renishaw+plc

Re: BiSS Serial Protocol

grivilla — Tue, 24 May 2011 05:09:21 GMT

@bmann2000

thank you very much for the information. in the mean time I've got the following information from NI-Support, Mr Bill Allai:

"Yes we have support for BiSS in the works. The HW module to support BiSS (and other absolute encoder protocols) for our cRIO platform is already completed. Our release is tied to the SW development. Our current release timeline is August of this year with BETA SW available in July. "

so, it seems there will be a solution for BiSS.