Motorola ASTRO XTL 5000 Basic Service Manual page 142

9-4
Table 9-2. J2 Rear Accessory Connector Signal and Voltage Descriptions (Continued)
Pin
12 USB PWR
13 CHAN ACT
14 GROUND
15 EMERGENCY
16 AUX PTT*
17 ONE WIRE
18 VIP OUT 1
19 VIP OUT 2
20 SPKR+
21 RX FILT AUDIO Receive Filtered Audio
22 MONITOR
23 AUX MIC
24 SW B+
25 Ignition
26 SPKR-
October 30, 2006
Function
USB Power
Channel Activity
Ground
Emergency
Push To Talk
One-Wire data
Vehicular Interface
Output
Vehicular Interface
Output
Speaker +
Out
Monitor overrides PL
Rear microphone input
Switched Battery Voltage This voltage is available when the radio is switched
Ignition Sense
Speaker -
Basic Troubleshooting: Accessory Connectors
Description
Used for USB enumeration. Five volts is applied to
this pin by the USB Host.
0-5 volt output used for indicating detection/
unsquelching of a qualified received signal. As of the
release of this manual only UHF R2 is APCO
compliant active low.
Preferred ground for any of the analog lines on the
rear connector.
Input used to detect emergency activation. This pin
must be connected to ground by a jumper on
accessory cable if emergency is disabled, even if
disabled by CPS. If enabled, this line must be
grounded via a switch, which is normally closed.
Pulling this line to ground will activate PTT function
normally selecting the AUX_MIC input.
0-2.8V bidirectional data used for identification of
smart accessories/cables. Caution, an external
source of voltage could damage the microprocessor.
High voltage open drain output used for enabling
relays used for accessories such as horn/lights.
High voltage open drain output used for enabling
relays used for accessories such as horn/lights.
Used along with SPKR- to connect an external
speaker. The audio PA is a bridge amplifier with a
3.2-ohm minimum impedance.
This is a fixed level (independent of volume level)
received audio signal, including alert tones. Flat or
de-emphasis are programmed by CPS. Output
voltage is approximately 100 mVrms per 1kHz of
deviation. The DC offset is 1.4V.
This input is used to detect when a rear microphone
accessory is taken 'off-hook', to over-ride PL to alert
the user to busy traffic prior to transmitting.
This microphone signal is independent of the
microphone signal on the front microphone
connector. The nominal input level is 80mVrms for
60% deviation when used for motorcycle, but can
also support 300 mVrms for future APCO
accessories. The DC impedance is 1560 ohms and
the AC impedance is 560 ohms, 1Vrms max. 9V DC
with no input load.
on.
Connecting this line to the ignition line of the vehicle
will allow CPS ignition features such as "ignition
required for turn on" to be used. Connecting this line
to the car battery will defeat CPS ignition features.
Used along with SPKR+ to connect an external
speaker. The audio PA is a bridge amplifier with a
3.2-ohm minimum impedance.
6871769L01-A