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Looking for some guidance on best practice for Servo Enable for the 12A8 servo drives.  The original control has an AC transformer that sends 50V AC to a PCB that contains a rectifier bridge for DC voltage, has the connectors for the motors and tach signals, an interface for the -10/+10V control signals, as well as 3 relays.  One relay for the inhibit circuit for each drive and one to connect the DC drive voltage to the servo drives.  However, all three relays are driven by one 12V control signal.  I was hoping to reuse the existing power supply and pcb and plan to interface with it via the Mesa 7i97T.    From what I've read though, you cannot have two output signals connected to one physical pin, for example X Servo and Y Servo enable both driven by X servo enable circuit.  

Here are the options I'm considering:
1. Wire both enables from X and Y to the 12V relay, not sure if this would cause issues on the Mesa board if for some reason one servo was enabled and the other was not. Although, from reading the 7i97T manual, it seems like the enables are all switched in common?
2. Bypass the circuit board for enables and go straight to the drives with the enable circuit  (However, I would still need to enable the relay to connect drive power, so not sure which signal I could use for this.)  Perhaps I could make a new signal that would send 12V from the Mesa board if either of the X or Y drive enable commands are enabled, or route this to the estop switch and control it outside of the 7i97T.
3.  Any better ideas?
 

I attach 2 images of different boards Pcie.La board that has Kernel Driver parport_serial(Linuxcnc boots clean without the alarm in question). The board that has the Kernel Driver Serial (Triggers the Alarm in question). Both plates work perfectly.
I insist on the concept of a parallelized serial port. The PCEI architecture is serial and the expansion boards are responsible for parallelizing so that we can have an LPT port at the end. LinuxCNC should contemplate this situation to boot clean without the alarm. Because everything works perfectly.

You lucky b....
Leave the small one in, yank the big one out.
Nice that i do not have to explain more as the physically small is also capacity small.
Reason for it being, the small one seems to be M-SATA only, so it will not work on some normal mainboards, while the big one works on anything with a normal SATA connector. Or you can buy an external case for the big one at usually 7-15$ (insist on finding a USB-C or USB 3.0) and use it for whatever you like, even installing LinuxCNC on it and testing any PC you come near to, since Linux boots from anything and on anything (well almost, for me 99% of the time)

Focus is a bit off but it's exactly the same as mine. If you disconnect at the elbow you will see what I mean about the tube going to the rotary joint being free to spin.
The way they are set up means you couldn't extent the Y quill for a special machining set up as the elbow would jamb on the rear of the Y slide.
Maybe you could shine a torch down the hole to see if there is anything else stopping the tube pulling out with the quill.
I haven't had a chance to figure out if there is an anti rotation slot and pin on the quill. You have to remove the one on the Z quill to remove that quill.
Cheers,
David

Just got my BRIX i7-7557 delivered and I pulled it apart to just look inside as the listing said 256gb SSD. Well it has 2 SSDs, one mounted to the board and the other mounted to the back cover like normal. Both of them Samsung with the small board mounted one being 500gb and the cover mounted o e being 1TB and it’s an 850 EVO which shocked me. I only paid $110 for this computer and wasn’t expecting this much coin in SSDs to be inside. 

what do you recommend, pull one and just use the board  mounted SSD ok keep them both? Seams kinda over kill to use such a nice SSD for just LinuxCNC QRplasmaC.
Thank you for any advice you can provide on setting this up for optimal performance.