INSTALLATIONMTM5400 Mobile Terminal Installation Manual63
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| Table 10 |
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Pin | Function | Description |
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1 | Audio + | Balanced Audio + (Bidirectional) |
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2 | Not Connected |
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3 | BUS+ | This is used for communication between the radio and an Enhanced Control Head. |
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4 | Audio- | Balanced Audio - (Bidirectional) |
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5 | Not Connected |
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6 | Ground | Ground |
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7 | Radio On/Off Control | This is the Enhanced Control Head service request input. A level of 5 volts |
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| indicates that the Enhanced Control Head needs to communicate with the radio. In |
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| addition it switches on the radio's voltage regulators. The idle state is a level below |
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| 0.6V. |
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8 | SCI_TX | This if for communication between the radio and the Enhanced Control Head. |
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9 | FLT_A+ | This voltage is at battery voltage level and is available as long as the radio is |
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| connected to the supply voltage. The maximum current is 300mA. A fuse in the |
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| radio prevents further circuit damage in case of shorting this pin to ground. |
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10 | Analog Ground | Analog Ground |
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25-Pin subD Connector
Data Expansion Head Enhanced:
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| Table 11 |
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Pin | Function | Description |
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1 | GND | Ground |
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2 | RS232_SCI_TX | Transceive data (RS232 line with RS232 level) |
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3 | RS232_SCI_RX | Receive data (RS232 line with RS232 level) |
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4 | RS232_RTS | Request to Send (RS232 line with RS232 level) |
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5 | RS232_CTS | Clear to Send (RS232 line with RS232 level) |
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6 | FLT_A+ | Filtered unswitched UB+ / 200mA |
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7 | Signal_GND | Ground for RS232 |
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9 | NC | Not Connected |
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10 | NC | Not Connected |
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11 | NC | Not Connected |
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12 | SW_B+ | Switched UB +/100mA |
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13 |
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