66 | MTM5400 Mobile Terminal Installation Manual | INSTALLATION |
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| 25 | 14 |
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| Figure 29 View of the Enhanced Control Head’s rear connectors | ||||||
| Table 14 | ||||||
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Telco Connector Pin | Function |
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| Description | ||
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1 | AUDIO + |
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| Balanced Audio + (Bidirectional) | ||
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2 | NC |
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| Not Connected | ||
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3 | BUS + | This is used for communication between the radio and an | |||||
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| Enhanced Control Head. | ||
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4 | AUDIO - |
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| Balanced Audio - (Bidirectional) | ||
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5 | NC |
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| Not Connected | ||
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6 | GND |
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| Ground | ||
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7 | Radio On/Off Control | This is the Enhanced Control Head service request input. | |||||
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| A level of 5 volts indicates that the Enhanced Control Head | |||||
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| needs to communicate with the radio. In addition it | |||||
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| switches on the radio's voltage regulators. The idle state is | |||||
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| a level below 0.6V. | ||
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8 | SCI_TX | This if for communication between the radio and the | |||||
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| Enhanced Control Head. | ||
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9 | FLT_A + | This voltage is at battery voltage level and is available as | |||||
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| long as the radio is connected to the supply voltage. The | |||||
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| maximum current is 300mA. A fuse in the radio prevents | |||||
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| further circuit damage in case of shorting this pin to | |||||
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| ground. | ||
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10 | Analog Ground |
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| Analog Ground | ||
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