User's Manual

3-4 Indicators and Connectors Rear Panel
1
Pulling this line to ground activates the PTT function, thus activating the AUX_MIC input.
2
Fixed level (independent of volume level) received audio signal, including alert tones. Flat or de-emphasis are
programmed by CPS. Output voltage is approximately 330 mVrms for 1 kHz of deviation.
3
This input is used to detect when a rear microphone accessory is taken off-hook.
4
This microphone signal is independent of the microphone signal on the front microphone connector. The nominal
input level is 80 mVrms for 60% deviation. The DC impedance is 660 ohms and the AC impedance is 560 ohms.
Table 3-1 Rear Accessory Connector Pin Functions
Pin
No.
Pin Name Pin Function
Pin
No.
Pin Name Pin Function
1 D+ USB + (Data) 14 Rx Audio Receive Live Audio
2
2 D - USB - (Data) 15 AUX Audio 2 PUBLIC Address 2
3 VBUS
USB Power (5V from USB
accessory/cable)
16 GND Ground
4 USB/MAP_ID GND USB/MAP_ID Ground 17 GP5-1 (PTT) 5V Level GPIO, PTT Input
1
5 MAP_ID_2 Accessory Identifier 18 GND Ground
6 MAP_ID_1 Accessory Identifier 19 GP5-2 (Monitor) 5V Level GPIO, Monitor Input
3
7 SW B+ Switched Battery Voltage 20 GP5-6 5V Level GPIO
8 PWRGND Ground 21 GP5-3
5V Level GPIO, Channel
Activity Function
9 SPKR-
Speaker - (3.2 ohm minimum
impedance)
22 GP5-7 5V Level GPIO
10 SPKR+
Speaker + (3.2 ohm minimum
impedance)
23 EMERGENCY Emergency Switch Input
11 Tx Audio
Rear External Microphone
Input
4
24 GP5-8 No connection
12 Audio GND Audio Ground 25 IGN SENSE No connection
13 AUX Audio 1 PUBLIC Address 1 26 VIP-1
12V Tolerant, 5V GPIO,
External alarm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
D+
Vbus
SW B+
Spkr-
Tx Audio
A
ux Audio Out 1 / RxD
Aux Audio Out 2 / TxD
GP5_1 (PTT)
GP5_2 (Monitor)
GP5_3 (Chan Act)
Emerg Sw
Ign Sense
D-
USB / MAP_ID Ground
MAP_ID_1
Power Ground
Spkr+
Audio Ground
Rx Audio
Ground
Ground
GP5_6
GP5_7
GP5_8
VIP_1 (Ext Alarm)
MAP_ID_2