INSTALLATION
CM5000 TETRA Mobile Repeater/Gateway Installation Manual
41
Connectors & Pin Assignment of the Radio
Transceiver Rear Side - Pin Function
Figure 16
Location of Accessory Connector and Expansion Connector - Rear Side
This section gives a description of the Accessory Connector and Expansion Connector pin
functions. The Expansion Connector provides a 4-wire RS232 interface for connecting Data
Devices.
The accessory connections shown are not compatible to
some other models of Motorola radios. Check the appro-
priate accessory or technical manual for further informa-
tion.
Table 6
20-Pin Accessory Connector
Pin
Function
Description
1
EXTERNAL
SPEAKER -
Speaker - and S (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.
7
ANALOG GROUND
Analogue Ground
8
DIGITAL_GROUND
Digital Ground
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.
18
16
14
12
10
17
15
13
11
9
7
5
3
1
19
8
6
4
2
20
*Note the location of Pin 1
Accessor y Connector
7 pin RS232 connector
