Motorola GM pinout
1) speaker -
2) external mic
3) digital in 1 (ext.PTT use external mic/data PTT use flat Tx audio)
4) digital out 2 (external alarm)
5) flat Tx audio, sensitivity 150mV rms to 60% deviation
6) digital in 3
7) ground
8) digital in/out 4
9) digital in 5 with wakeup (emergency)
10) digital in 6 with wakeup (ignition)
11) flat/filtered Rx audio
12) digital in/out 7
13) switched battery voltage (max.1A,dropout voltage max. 1V)
14) digital in/out8
15) RSSI (radio signal strength indicator)
16) speaker +
17) BUS + (used for CFPS and Flash)
18) BOOT control
19) reserved
20) reserved
and position of pins goes: upper pins from left to right: 20,2 4,6,8,10,12,14,16,18
bottom pins from left to right : 19,1,3,5,7,9,11,13,15,17,
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