TM9100 Service Manual Description 41© Tait Electronics Limited August 20052.3.7 Microphone ConnectorThe microphone connector of the control head is an RJ45 socket.When the control head is connected to the control-head connector of theradio body using the loom provided, the microphone connector uses thefollowing eight control-head connector signals:Table 2.6 Microphone connector – pins and signalsPinout Pin Signal name Description Signal type1 MIC_RX_AUD Receive audio output. Analog2 +13V8a Power supply output. Switched offwhen radio body is switched off.Power3 MIC_TXD Asynchronous serial port -Transmit data.3.3V CMOS4 MIC_PTT PTT input from microphone. Also carrieshookswitch signal.Digital5 MIC_AUD Fist microphone audio input. Analog6 AGND Analog ground. Analog ground7 MIC_RXD Asynchronous serial port - Receive data. 3.3V CMOS8 MIC_GPIO1 General purpose digital input/output. Open collector out3.3V CMOS ina. Can be switched or unswitched. For more information refer to “Connector Power Supply Options” on page 85.BIfront view
