60 MTM800 Enhanced Mobile Terminal Installation Manual INSTALLATION
11 RX_AUDIO This is the received RX signal. Output impedance approximate 600 Ohms;
unsymmetrical;
Output level = 775mV
RMS
12 AUDIO_PA_ENABLE This is a digital input. High level or pin enables the audio PA. Low level disables the
audio PA.
13 SWB + This voltage is available when the radio is switched on.
The max. current is 1.0A w/o GPS board and 0.8A with GPS board mounted.
14 HOOK This is a high active digital input.
Low = On hook; High = Off hook
15* SCI_DTR Data Terminal Ready, used for clock input for high speed flashing.
Reserved for Service Aids.
16 SPEAKER + Positive output of radio's audio PA (see Pin 1).
17* SCI_CTS Radio OUTPUT: Clear To Send.
Reserved for Service Aids
18* SCI_RTS Radio INPUT: Request To Send.
Reserved for Service Aids
19* SCI_RXD Radio OUTPUT: Receive Data.
Reserved for Service Aids
20* SCI_TXD Radio INPUT: Transmit Data.
Reserved for Service Aids
The 4-wire 3 Volts SCI interface on the accessory
connector (pins 17 -20) can only be used for flashing of
radio firmware and programming software features. It can
NOT be used for communication during normal radio
operation.
PIN 10: If the ignition line is not used, it needs to be
grounded for example connected to pin 7 or 8.
Interference can cause radio to hang.
Table 10 20-Pin Accessory Connector
Pin Function Description
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