MIDI Start-Up Errors

Am a novice with Linux CNC, and have a XYZA mill with Limit Switches configured at end of travel on axes X, Y, & Z. Axis A is not configured with any Limit Switch. When use Ver 2.6, in Axis, I home all axes, then jog to Touch Off position, and try to assign G54 offsets, but program prevents me & issues error message "Can't issue MIDI command when not homed".

In Ver 2.7, I Hit F1 to clear any E-Stops, then F2 to toggle Machine On, and the error message "Joint 2 on Limit Switch Error" appears locking me out from the program completely.

Can anyone suggest how to diagnose & fix what appears to be wrong?

Mak sure your homing offset moves your axis off the limit switch in the homing offsets. You have a shared limit switch so when it comes out of home, the limit switch is still enabled. Anyway, that is what I found on my shared switch.

Thx for the reply rodw, but I do not believe that is the cause of my problems. Should've clarified my desktop mill is driven by a Gecko 540 and communication to/from PC is via parallel port. The three limit switches use separate par-port pins #11, 12, & 13. And all switches are configured to 1) trip the switch then 2) back off to open the switch and finally 3) back off further another 0.1" equal to homing offset. Plus when I ran the homing sequence in Ver 2.6, all axes responded flawlessly & I can see daylight between switch and carriage when final home position was reached.

My Gecko is equipped with an external (hard) E-Stop. I used BigJohn's E-Stop latch routine to accommodate both the soft E-Stop in LinuxCNC & the hard E-Stop on my Gecko.

Not being a HAL expert, is there someone out there I can send my .int & .hal files plus my par_port pin configuration to - who can help me further troubleshoot the problems? I have spent numerous days trying to get my system running - looking thru many pages of LinuxCNC and Wiki documentation and forum threads and still am unable to configure my machine to to load its first G-Code file.