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Parallel Port breakout boards, motherboards, and dedicated accessories / Will a PMDX-126 rev C work to replace this BOB which came with

« on: March 09, 2016, 11:36:03 PM »

I purchased a PMDX 126 rev c and a pmdx 107. I tried to install these boards to replace my current BOB. I could not get the install to work correctly, there was movement but very jerky and unstable, so I had to put the old one back in. I'm trying to figure out why it didn't work, I think I know why, but would like to ask for confirmation from a more experienced user, because experienced I am not. Here is why I think it didn't work. In the notes in the manual it says a 24V totem pole to GND system is incompatible with the PMDX 126 that all 24V signals must be PNP-style (I don't know what that means) where the signal is either driven to 24V or left floating (don't know what that means either). I'm assuming I have a compatibility issue here but am unsure and would like verification. Ive attached a pic of my current BOB so you can see what I'm looking at (the 24V and GND connections next to eachother).  If I do have compatibility issues are there any options that I can pursue to get myself to an upgraded BOB (PMDX 126), spindle control, (PMDX 107) and smoothstepper? Thanks for your time and help in advance.