Motorola GM Series, Installation Manual

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Accessory Connections 1-13
6.0 Accessory Connections
6.1 Accessory Connector Pin Functions
This section gives a description of the accessory connector pin functions.
CAUTION: 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 1-4 Connector Pin Functions
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
Ω
.
The internal speaker can be disabled by removing the control head.
Disconnect the internal speaker and assemble the control head back to the
radio.
2 External Mic
Audio External or Emergency Mic depends on dealer programming. This
microphone signal is independent of the microphone signal on the
microphone connector. The nominal input level is 80mV for 60% deviation.
The DC impedance is 660
Ω
and the AC impedance is 560
Ω
.
3 Digital In 1 This is a digital input only and the primary use for this pin is external PTT. This
pin must be used if fast DATA PTT is required.
(See Note 1).
4 Digital Out 2 This is a digital output only and the primary use for this pin is as an external
alarm output (See Note 3).
5 Flat_TX_Audio
(NPD Data Out) This input is intended for injecting signals into the transmit path that should
not be filtered; for example, the analog output of a modem.
The nominal input level is 150mVrms for 60% deviation. The impedance is
greater than 25k
Ω
.
6 Digital In 3 This is a digital input only. Function depends on dealer programming.
(See Note 4).
7 Ground Used as ground for both analog and digital signals
8 Digital In/Out 4 This is a digital input/output depending on dealer programming.
(See Notes 1, 2).
9 Digital In 5 with
Wakeup
Emergency
(NPD Call RQS) This is a digital input only. Emergency can be enabled via the CPS. To
activate, this line must be connected to ground; this will turn on the radio. The
CPS details which functions may be assigned to this pin by the codeplug.
10 Ignition Detect 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.
!