Starting over

andypugh wrote: Because the pin allocation is set in firmware, and not HAL, it turns out that the HAL code is almost (and sometimes exactly) the same even if the firmware and physical pins change. So you can use the settings for a probotix breakout as long as your actual firmware is G540.

So, in PNCConf choose the 5i25 internal data and prob_rfx2 option (which is a simple dumb breakout). and choose "accept component changes"
Then configure connector 3. (which is the DB25 connector on the 5i25) and you will see "unused stepgens" numbered 0, 1, 2 and 3. Choose axes for these to suit how you want to wire the G540, for example 0 = X, 1 = tandem X, 2 = Y, 3 = Z.

I think that GPIO 000 is charge pump on the G540? If so then choose GPIO 000 as control-> charge-pump

This setup should be really very close:

I have had some success getting the axis working and the X2 set up correctly however PNCCONF doesn't seem to offer a limit/home for X2.

Did I miss something in PNCCONF?

It seems that Pncconf does not know how to add a limit switch for the tandem actuator.

You might want to consider switching to version 2.8 (not that Pncconf can do the tandem limit switch there either) but some elements of a gantry configuration are much simpler there.

(If you scan through the changes you might get some feel for how much better-suited for a gantry it now is)
linuxcnc.org/docs/devel/html/getting-sta..._configuration_files

andypugh wrote: You might want to consider switching to version 2.8 (not that Pncconf can do the tandem limit switch there either) but some elements of a gantry configuration are much simpler there.

I took the safe route and bought the hard drive with 2.8 preinstalled to eliminate at least one potential configuration goof up.

To my eye the HAL doesn't appear to have 2.8 features for the gantry.

andypugh wrote: (If you scan through the changes you might get some feel for how much better-suited for a gantry it now is)
linuxcnc.org/docs/devel/html/getting-sta..._configuration_files

If I an interpreting the 2.8 documentation correctly, neither my HAL nor my INI appear to take advantage of the 2.8 joints_axes structure. Is there a argument I need for pncconf?

it may be that your particular 2.8 is from before the merge of JA.

Does the Synaptic package manager "see" LinuxCNC?

It is installed:



but it is not in sources.list

You might want to get a newer 2.8 from the Buildbot

buildbot.linuxcnc.org/