Motorola MTM800 Installation Manual page 60

60
Pin Function
11 RX_AUDIO
12 AUDIO_PA_ENABLE
13 SWB +
14 HOOK
15* SCI_DTR
16 SPEAKER +
17* SCI_CTS
18* SCI_RTS
19* SCI_RXD
20* SCI_TXD
MTM800 Enhanced Mobile Terminal Installation Manual
Table 10 20-Pin Accessory Connector
This is the received RX signal. Output impedance approximate 600 Ohms;
unsymmetrical;
Output level = 775mV
This is a digital input. High level or pin enables the audio PA. Low level disables the
audio PA.
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.
This is a high active digital input.
Low = On hook; High = Off hook
Data Terminal Ready, used for clock input for high speed flashing.
Reserved for Service Aids.
Positive output of radio's audio PA (see Pin 1).
Radio OUTPUT: Clear To Send.
Reserved for Service Aids
Radio INPUT: Request To Send.
Reserved for Service Aids
Radio OUTPUT: Receive Data.
Reserved for Service Aids
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.
Description
RMS
INSTALLATION