Can I connect a NPN inductive home switch direct to my BOB or do I need a relay?

Hi all,

I just set up my lathe configuration with Linuxcnc.
I use the stepconf wizard with the very common cheap china 5 axis breakout board.

Can I connect a NPN inductive home switch with GND direct to the IN ports (10-15) on the BOB or do I need a relay?

The GND of the IN ports is not connected to the other GND pins on the BOB.

So I think I have to use the GND of the IN ports and +5V of the BB for the inductive proximity switch and connect the output to
an IN port (10-15).
When the switch changes to closed the IN port will be pulled to GND and Linuxcnc will recognize the homing.

Or am I wrong and will need a relay to pull the IN port to GND?

I would be very happy if someone could answer my question.

Greetings and best thanks for reading

Ralf

YOU need a RELAY
and yoiu can connect all REF / Limit to one PIN

wirering is
12-24V to A1 of the Relay
A2 from the Relay to the BLACK cable of the NPN (LJ12A3 BX)
the Broun cable of the NPN is 12-24V
the blue one goes to Gnd


COM RELAY goes to BOB left side GND
NO of the Relay is P10-P15

PLEASE REMEMBER THAT THIS BOB NEEDS TO BE CONNECTED to 12-24V on the RIGHT SIDE to get the INPUTS tp work
SEE my YT channel


and