UNImig/Jasic RazorCut CNC Interface Pinout

Unimig/Jasic has fitted a CNC interface to their lineup of plasma units.

This is great news however it’s so new that it’s not yet documented.

Here is the info we have ascertained, NOTE that this info specifically relates to the 45A unit, Unimig have given us this info for the 80A and we are going to be testing the 80A Razor Cut, we will report if it all goes well or … bricks the cutter.

Any information on this page is just discussion and notes, if it’s in an orange border then It came to us in writing from Unimig and we guess it can be trusted, otherwise it’s simply thoughts and experiences!  Please if you find more info in your travels that we have not documented here, email to [email protected] so we can include it here to help others!

Confirmed with Unimig -22/09/2017 – This information provided is 100% valid for the 80A jobbie as well.  Confirmed 1/10/2017 by testing the plasma on a CNC with the Masso – works as they promised.

 Schematic diagram as follows:

(Source Unimig Australia)

Razor Cut CNC Interface Pinout1 

3DTek Note: that we only have 4 pins on the RazorCut 80’s left-hand side socket.  Also the pinout on the plug is ascending in a clockwise direction, not anticlockwise as per Unimigs Drawing above

Confirmed with Unimig -22/09/2017 –  the pinout for pins 1-4 is the same and we just ignore the fact that the 5th pin is not present.

As shown: (with 5th pin;)



2 pin socket (XS12K2P)used for output interface of the Arc voltage signal

(Source Unimig Australia)

Pin no




Arc voltage feedback“+”

Arc voltage feedback value is a fixed proportion of output,initial setting is 20:1,Can be adjusted according to user requirements


Arc voltage feedback “-”


3DTek Assumptions: We assume that its a simple voltage divider and that it’s not galvanically isolated?  We will be playing with one this week and may have a peek inside to find out! –

This output will be for the torch height controller, we will test with the Proma 150.

20:1 voltage division is not so exciting, 50:1 is more common and so most torch height controllers might not accept such a high voltage. The Proma 150 unit we are going to use has a max voltage input of 10V (although being tested to 60v) and can only manage working with a 1:50 divider.  Seems strange that there is not a settable parameter to allow for other divider ratios.  We may have to add a second voltage divider between the plasma and Proma 150 or look at tapping off and using the full arc voltage which… we don’t want to do;(

Update – 21/9/17 – Upon opening the Unimig Raxor Cut 80 we found clearly labelled ring terminals for the full arc voltage that we were able to tap off.  Highly not recommended and will not likely be documented here.  An additional voltage divider to further split the Unimigs 1:20 division out to Promas required 1:50 division would be a better/safer/warranty protecting idea.


5 pin socket (XS12K5P)used for Starting signal (input) and arc starting success signal (output). 

(Source Unimig Australia)

Pin no




Starting signal input

normally open, The open circuit voltage is 5 VDC; Needing dry contact closure activation at startup


arc starting success signal output

Relay normally open contacts, closed after start arc successfully. load capacity is 1A/30VDC,0.5A/125VAC





3DTek Notes:

This plug will need to be connected to a CNC controller, not a torch height controller.  We will be using the Masso by Hind Technology.  

Note that we only have 4 pins on the RazorCut 80’s left-hand side socket. We have confirmed with Unimig that the pinout for 1-4 is the same and we just ignore the fact that the 5th pin is not present.

More assumptions,

Pins 1,2, Plasma Fire Input:  It appears to call for us to short the two wires on pins one and two together when we want to fire the plasma.  And there is mention that there is 5v DC hanging around on this circuit so we guess that one of the pins one or two is the control line and is likely pulled up to the internal 5v logic in the plasma control unit, the other might be a ground line and so when they are connected the control line drops to ground which is the signal for the unit to fire.  

Pins 3,4, Arc OK Output:  These appear to be a normally open output that will close to give us the Arc OK signal.  So we guess that this will be our ground and ok signals and that there will not be any polarity between the two.  For the Masso, we intend to connect our 12-24V to one of these pins and a spare Masso input, of which there are so many;), to the other. There is also an Arc ok output signal available from the Proma, which to use?

Pin 5: looks to be No Connect (NC)?  Yes – Confirmed with Unimig, if the 5th pin is even there at all,  it’s not used!