Motorola TLN4868A Tone Remote

[TomzWW]

I was wondering, if anyone can tell me which one of these connections, if any, would be the channel busy (CAS, RUS, or BUSY) connection to attatch the encoder busy sensor too on my Motorola TLN4868A Tone Remote?

1 GRD (system ground)
2 Mic Lo
3 Mic Hi
4 Quik Call
5 Signal Tones
6 Aux Rec
7 SP
8 DC Line +
9 DC Line -
10 12 VDC +
11 12 VDC -
12 8 Ω Grd
13 8 Ω Hot
14 8 Ω Mute
15 DS PTT
16 Mic PTT
17 Alt Line +
18 Alt Line -
19 PL - Dis
20 LOS Reset
21 Audio "A"
22 SP
23 Page PTT
24 TEL
25 Audio Line -
26 Audio Line +
27 DS Mic Lo
28 DS Mic Hi
29 SP
30 Supv Cont +
31 Supv Cont -

I know what some of these are ,
however, if anyone can also shed light on items, 4,5,6,7,12,13,14,17,18,20,21,2 2,23,24,25,26,29,30 and 31.

yea,, i dont know more of them than i do,, LOL

Thanks for anyone that can shed light on the primary question here,, and to anyone that can offer some fill in explanations.

Regards
Tom