Elecraft K3 E1a and E2a mic cables

[K1IKE-Joe]

I'm working on an Elecraft K3 remote setup.  I was looking at the two factory cables for the microphones connections and they both have the RJ45 pin 7 wired to the mike jack pin 5.  The drawings in the USER MANUAL do not show this connection.  Pin 5 of the K3 is used by the button on the microphone and is a programmable feature (OFF or ON).  Is this feature supported by the 1258?

73, Joe, K1ike

[sm2o]

Only Mic audio and PTT are supported in the K3 setup

73 de mike