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Further to the above post, I found the problem - a lack of clearance between a conductor and the ground plane of the motherboard which stopped the direction pin of the A-axis opto-isolator from...

Sorry everyone, disregard my previous post.

I still have the problem, but I have confirmed that the fault is in the G540.

I decided to check voltages when the ESS Smoothstepper is connected...

I have Mach3 driving a G540 and have been successfully using it to generate clock parts for the last year or so.

I recently purchased a 4th (rotary) axis and wired it up, only to find that it...