INSTALLATION MTM800 Enhanced Mobile Terminal Installation Manual 59
Connectors and Pin Assignment of the Radio
Transceiver Rear Side - Pin Function
Figure 26 Location of Accessory Connector - Rear Side
This section gives a description of the Accessory Connector pin functions.
The accessory connections shown are not compatible to
some other models of Motorola radios. Check the
appropriate accessory or technical manual for further
information.
Table 10 20-Pin Accessory Connector
Pin Function Description
1 EXTERNAL
SPEAKER -
Speaker - and Speaker + (Pin 16) are used to connect an external speaker. The audio
PA is a bridge amplifier with a minimum load resistance of 3.2 ohms.
2 EXTERNAL MIC
AUDIO
External-, Emergency-, or Hot-Microphone; depends on CPS programming. This
microphone signal is independent of the microphone signal on the microphone
connector. The DC impedance is 660 ohms and the AC impedance is 560 ohms.
3 EXTERNAL PTT This is a digital input to trigger external PTT; active low; non active high
4 EXTERNAL ALARM This is a digital output for External Alarm/Fault Indication; active low; open collector
with 4k7 Ohms pull up to B+.
5 TX_AUDIO This input is intended for injecting signals into the transmit path. Input impedance > 10
k Ohms;
Input level = 775mV
RMS
6 KEYFAIL/FLASH This line supports the encryption module and the flash mode.
Service Aids: 12 volts at this pin during power up/on brings the radio into the flash
mode.
7 ANALOG GROUND Analogue Ground (the same as pin 8)
8 DIGITAL_GROUND Digital Ground (the same as pin 7)
9 EMERGENCY To activate this functionality the pin has to be connected to ground. This will turn on the
radio.
10 IGNITION Connecting this pin to the ignition line of the vehicle that will automatically turn on the
radio if ignition of the vehicle is turned on. High active.
1816141210
1715
13119753
1
19
864220
*Note the location of Pin 1
Accessory Connector
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