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INSTALLATION
Pin
Function
14
RX_AUDIO
15
MIC2
16
GND_MIC
17
EXTERNAL_PTT
18
UART2_DTR /
USBy_ID
19
HOOK_PA_EN
20
UART2_TXD /
USBy_TX
21
UART2_RTS /
USBy_VBUS
22
UART2_RXD /
USBy_RX
23
EMERGENCY
24
UART_CTS
25
IGNITION
26
EXTERNAL ALARM
MTM5400 Mobile Terminal Installation Manual
Table 9 26-Pin Accessory Connector
RX audio output
MIC2 for noise cancelling dual mic input
Ground (for MIC)
PTT input (pulled via 4K7 to 5V)
RS232 or UART1 / UART2 DTR / 2nd USB2.0 (OTG) ID
HOOK_PA_EN input (or programmable 5V GPIO)
RS232 or UART2 TXD / 2nd USB2.0 (OTG) D+
RS232 or UART2 RTS / 2nd USB2.0 (OTG) VBUS – 100mA
RS232 or UART2 RXD / 2nd USB2.0 (OTG) D-
Emergency Input (Pulled via 24K9 to A+) – Pull low to power on
RS232 or UART1 / UART2 CTS input
Ignition input (through series 15K) – Pull > 5V to power on
External Alarm input (Pulled via 4K7 to A+)
PIN 25: If the ignition line is not used, it needs to be
grounded for example connected to pin 8. Interference can
cause radio to hang.
Description
59
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