HI.
Can someone please tell me what kind of plug goes in here?
Thanks.
Pretty sure it’s a 3.5mm pitch pluggable screw terminal.
https://www.mouser.com/Mobile/Connectors/Terminal-Blocks/Pluggable-Terminal-Blocks/_/N-7rqe3/?P=1z0wxmnZ1yx0y8x
3.5mm, 7 conductor, 14-30 AWG plug.
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ahhhhaaa.
the beauty of open source.
I haven’t actually used any of these, but from various manufacturer’s datasheets it appears that they are not stackable.
https://discuss.inventables.com/t/plug-question/48731/9?u=darrin1200
If its a new Xcontroller, it should have come with one. I just recieved and assembled mine before Christmas, and it included all 4 plugs. I actually just hooked up an Iot Relay to that very plug.
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Note - that one is 5.08mm pitch, it will not fit the X-controller!
Also, I have 10 of those if anyone needs one 
I’m having a bitch of a time sourcing the 3.5mm kind that doesn’t involve a slow boat and 3 weeks wait.
Why couldnt they have gone with the 5.08mm version that’s all over the place…
I dont have the Xcontroller so dont know the plug dimensions for that one - but for those who use other drivers like DM542 and the likes need the 3.81mm pitch plugs.
Add some ferrules to that and you are good to go 
Based on the information in this thread:
3.5mm pitch, 7position Phoenix Contact connector, I found this product on digi-key:
https://www.digikey.com/product-detail/en/phoenix-contact/1840418/277-5770-ND/2527983
It’ll arrive in a few days, hopefully I can confirm this works with the xcontroller.
Did it work?