INSTALLATIONMTM5400 Mobile Terminal Installation Manual59
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| Table 9 |
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Pin | Function | Description |
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14 | RX_AUDIO | RX audio output |
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15 | MIC2 | MIC2 for noise cancelling dual mic input |
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16 | GND_MIC | Ground (for MIC) |
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17 | EXTERNAL_PTT | PTT input (pulled via 4K7 to 5V) |
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18 | UART2_DTR / | RS232 or UART1 / UART2 DTR / 2nd USB2.0 (OTG) ID |
| USBy_ID |
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19 | HOOK_PA_EN | HOOK_PA_EN input (or programmable 5V GPIO) |
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20 | UART2_TXD / | RS232 or UART2 TXD / 2nd USB2.0 (OTG) D+ |
| USBy_TX |
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21 | UART2_RTS / | RS232 or UART2 RTS / 2nd USB2.0 (OTG) VBUS – 100mA |
| USBy_VBUS |
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22 | UART2_RXD / | RS232 or UART2 RXD / 2nd USB2.0 (OTG) D- |
| USBy_RX |
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23 | EMERGENCY | Emergency Input (Pulled via 24K9 to A+) – Pull low to power on |
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24 | UART_CTS | RS232 or UART1 / UART2 CTS input |
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25 | IGNITION | Ignition input (through series 15K) – Pull > 5V to power on |
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26 | EXTERNAL ALARM | External Alarm input (Pulled via 4K7 to A+) |
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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.
