The pinout of the M110 DB9 accessory connector is the same as the MC Micro, but external alert is not switchable (permanent in the M110).
J5(DB9)
PIN     DESCRIPTION
1       PTT INPUT
2       AUDIO GND INPUT
3       GND (Hang up optional with jumper)
4       SPEAKER Hi Pot OUTPUT
5       SPEAKER Lo Pot OUTPUT
6       MICROPHONE Hi Pot INPUT
7       BUFFERED RX AUDIO OUTPUT
8       EXTERNAL ALERT OUTPUT
9       EMERGENCY SWITCH INPUT

The pinout of the DB15 Control Head connector is as follows:
J4(DB15)
PIN     DESCRIPTION
1       CALL(Spare)
2       PTT
3       Vol Cont HI
4       Audio GND
5       Spkr Hi
6       B+
7       HUG/PGM
8       F1/F2(DATA2)
9       Tx Busy (RESET)
10      Mic Hi
11      Vol Cont Wiper
12      Spkr Lo
13      SW B+
14      GND
15      CSQ/UNSQ(DATA1)

The pinout of the Mic connector is as follows:
J1001 (RJ12)
PIN     DESCRIPTION
1       HUB(HOOK)/PGM
2       RX audio
3       PTT
4       Mic Hi 
5       AUDIO GND
6       GND

Count from the dot (1 is closest) at the front of the microphone connector. Or, cable inlet going away from you locking tab upwards, contacts facing down count from left to right.