Changing an Isel FB2 to LinuxCNC?

I think a RS-232 to RS-485 adapter maybe would not work, because the (chain of) LS-173 uses full duplex (4 wire) RS-485, and I think RS-232 only does half duplex.

Sadly, that maybe also means that a Raspberry Hat would probably not work, because looking at the pinout of the Raspberry, it also has only two pins labels RX/TX, though I guess some IO pins may be re-purposed if the hat comes with a full duplex serial port driver.

So in summary, I still like the 7C81 option best, also because I like the form factor, I have several Raspberries lying around, and it is one of the few boards that are in stock in the EU...

Though I do like the simplicity of the HAL driver (.comp) for the serial port, this was easy to follow even for me, and I think I understand how HAL works now . My initial confusion came from thinking I would have to translate G commands into servo driver commands in the HAL driver, which I understand now is of course not needed.

andypugh wrote:

Ah, I see! That makes sense now. Then I'll try the serial option - that would seem to be both the easiest and cheapest approach.

Thanks for all the help!