Accessory Connector Pin Functions - Motorola GM1200E Installation Manual

Accessory Connector Pin Functions

7.0 Accessory Connector Pin Functions
This section gives a description of the accessory connector pin functions.
CAUTION:
Pin Function
1 External
Speaker -
2 External Mic
Audio
3 External PTT
4 External Alarm
5 Flat_TX_Audio
(NPD Data Out)
6 SCI Data In
(Bus+)
7 Ground
8 SCI Data Out
9 Programmable
Input
(Emergency/
NPD Call RQS)
10 Ignition Detect
1-12
1. The accessory connections shown are not compatible to some other models of Motorola
radios. Check the appropriate accessory or technical manual for further information.
2. The output of pin 13 may be configured by a solder link within the radio. Switched B+ is the
default. The current limiting resistor (R0425) default is 22Ω, therefore extreme care must be
taken to avoid short circuiting this output to ground, which will damage the resistor. The
maximum continuous current allowed is 20mA.
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.
External or Emergency Mic depends on dealer programming.
This microphone signal input is common with the microphone signal input on the
microphone connector and is connected to the microphone path input of the
ASFIC. The nominal input level is 80mV for 60% deviation. The DC impedance is
1100 ohms and the AC impedance is 1000 ohms
Note: Only one microphone should be connected at any one time.
This is a digital input only and the primary use for this pin is external PTT.
(See Note 1).
This is a digital output only and the primary use for this pin is as an external
alarm output (See Note 3).
This input is intended for injecting signals into the transmit path that should not
be filtered, e.g. the digital output of a modem.
The nominal input level is 150mVRMS for 60% deviation. The impedance is
greater than 25kohms.
This connects to the radio's SCI serial bus which is used for programming and
tuning the radio. The line is also available at the microphone connector Pin 7.
Used as ground for both analogue and digital signals
This is a low power output and is not buffered. (See Notes 4).
This output is shared with the serial bus data line. It can be used as a normal
output, but will be overridden by serial data when the programming lead is
plugged in. To restore general purpose output operation, the programming lead
must be removed and the radio turned off, then on again.
This is a digital input only. Emergency can be enabled via the DPS. To activate,
this line must be connected to ground; this will turn on the radio. The DPS details
which functions may be assigned to this pin by the codeplug. (See Note 5).
Connecting this line to the ignition line of the vehicle will automatically turn the
radio on when the ignition of the vehicle is turned on. When ignition is connected,
the radio cannot be turned off as long as the ignition is active. When this line is at
0V or not connected, power on/off is under manual control. Resistor R0452,
10kΩ, which is not fitted as standard will cause the radio to be permanently on
whenever 12V is connected to the main power connector.
Description
Radio Installation