Motorola MTM5400

INSTALLATION MTM5400 Mobile Terminal Installation Manual 67
Table 15 25-Pin Back Connector
Back
Connector
Pin
Function Description Default
1 GPIO_9 GPIO Output: Active for duration of call (car
radio mute)
2 GPIO_6 GPIO PTT Input, TX audio from
MIC_REAR_2
3 GPIO_8 GPIO Disabled
4 GPIO_3 GCAI PIN 2 PTT Input, TX audio from
MIC_REAR_1
5 VBUS_1B GCAI PIN 6: 5V Supply Disabled
6 REAR_D - GCAI PIN 4: USB D -, GPIO_2
(Shared with the front MMP)
Disabled
7 REAR_D + GCAI PIN 8: USB D +, GPIO_1
(Shared with the front MMP)
Disabled
8 GPIO_0 GCAI PIN 10: GPIO Input: GCAI detection / Select Line
9 VBUS_2 Second USB 5 V Supply Disabled
10 TX 4-wire RS232 TX
11 RX 4-wire RS232 RX
12 MIC_REAR_2 Second Rear Microphone Disabled
13 GND Ground
14 GPIO_5 GPIO Disabled
15 GPI_7 4-Level Analogue Input Enabled
16 1_WIRE GCAI PIN 1: Bi-directional Serial Bus Disabled
17 HANDSET GCAI PIN 3: Handset Audio Output Parallel to front GCAI
18 GND GCAI PIN 5: Ground
19 MIC_REAR_1 GCAI PIN 7: Microphone Input Disabled
20 GPIO_4 GCAI PIN 9: GPIO Hook Input
21 USB_D + Second USB D +
22 USB_D - Second USB D -
23 RTS 4-wire RS232 RTS
24 CTS 4-wire RS232 CTS
25 PWR_ON Enhanced Control Head Power On
Input