Re: Simple CAN bus over ethernet interface

["Dmitry Yu. Bolkhovityanov via Tech-talk" <tech-talk at aps.anl.gov>]

On Tue, 24 Sep 2024, Evans, Richard K. (GRC-H000) via Tech-talk wrote:

> Hello,
>
> We have a new project requirement to read status via CAN bus into EPICS. Anyone have any advice on what CAN bus I/O hardware for a PC to buy?
It depends on how you want to interface CAN from PC: PCI, PCIe, USB, ...

For PCI-express, CP602E from MOXA works well.

For PCI, either MOXA CP602U or AdLink PCI7841; however, we had several 
AdLinks died (probably because of statics or spikes), while no MOXAs 
suffered.
The main question is software:

1. Which OS?

I'm not an expert in Windows, but colleagues had successfully used both 
MOXAs and AdLinks with respective drivers from card manufacturers.
For Linux, SocketCAN is the way to go.  AdLink, as many other PLX-based 
interfaces, is supported by Linux kernel since early 2010s; not sure about 
MOXA (stock kernel includes some strange PCI IDs for CP602*), but attached 
plx_pci driver works fine (the author, Pavel Cheblakov, had little time to 
push it into the kernel repository, thus we used to just compile our 
copy).
2. How do you plan to access CAN from EPICS?  And that mainly depends on 
which communication protocol your CAN hardware employs: CANopen, 
DeviceNet, something proprietary/custom?

With best regards,
Dmitry

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