PLUS+1 User Forum

PLUS+1™ Software => Communication => Topic started by: FluidPowerTom on September 25, 2019, 11:28:21 PM

Title: J1979 (not a typo)
Post by: FluidPowerTom on September 25, 2019, 11:28:21 PM
Is anyone familiar with J1979, and can you recommend a good document for applying it?  I'm finding references to the standards document and some articles about it, but I haven't found anything that breaks down the messages (11-bit CAN ID I think?).
Title: Re: J1979 (not a typo)
Post by: spittet on October 01, 2019, 06:07:10 PM
I have no clue, but I found this :

https://www.sae.org/standards/content/j1979_201702/

Maybe you could buy this standard (do not cost that much) and maybe you will find the required info.

Have a good day!

Sam
Title: Re: J1979 (not a typo)
Post by: FluidPowerTom on October 02, 2019, 05:43:30 PM
Sam, we do own several of the J1939 standards, but I don't think I'd recommend them to anyone as learning material for developing an application.  They're more low level than what is needed for a developer using a platform like PLUS+1.  They're great for referencing the details of various PGNs and SPNs once you already know what a PGN and a SPN is.
Title: Re: J1979 (not a typo)
Post by: oiltronic on October 02, 2019, 09:00:14 PM
You mean SAE J1979 a.k.a. OBDII?  Here's a message and PID breakdown:

https://www.csselectronics.com/screen/page/simple-intro-obd2-explained/language/en (https://www.csselectronics.com/screen/page/simple-intro-obd2-explained/language/en)

https://en.wikipedia.org/wiki/OBD-II_PIDs (https://en.wikipedia.org/wiki/OBD-II_PIDs)
Title: Re: J1979 (not a typo)
Post by: FluidPowerTom on October 03, 2019, 06:27:52 PM
Thanks!  Indeed the Wikipedia page was the best I'd found so far for practical application stuff I need, and I used that to build a list of transmissions and expected replies that I'll be testing soon.

I'll scope out the other link and see what I can learn.
Title: Re: J1979 (not a typo)
Post by: oiltronic on October 03, 2019, 06:45:38 PM
On a similar note, I find that the Danfoss controllers are very suitable for generic control applications requiring CAN communications, whether J1939, J1979, or ISO-BUS.  I have used them in rail, heavy truck, and agricultural applications where there's not a drop of hydraulic fluid (unless you count transmission fluid).  I hope the communications library expands to include these other protocol layers.
Title: Re: J1979 (not a typo)
Post by: FluidPowerTom on October 03, 2019, 08:39:00 PM
That's really good to know about ISOBUS.  I made a topic a while back in this forum asking about it, and all I got was the official answer that it's not supported.