FRIENDCOM FC-302 - Page 15

FC-302 Data Radio User Manual
Page 14
Mainboard is connected to power board（J106--J107）
No. Name Type Description
1 +12V I 12V power supply，used for voltage monitoring
2 GND I/O GND
3 BUSY O
BUSY output, dent from mainboard to power board. The default output low
level
4 AUDIO_IN I Audio input, Modulation sensitivity is 100mW
5 RXD I RX data
6 MIC_IN I
Microphones signal input from power board to mainboard. Modulation
sensitivity is 10mW.
7 RSSI O
Received field strength indicator for DC voltage output, the stronger the
signal ,the higher voltage is. Transferred from mainboard to power board
8 AUDIO_OUT O Audio output, 100mW, transferred from mainboard to power board
9 SWITCH I
Programmable switch, Configurable specific function options. Input port in
mainboard.
10 PTT I
TX control. low level when transmitting from power board to mainboard.
11 POCSAG I
POCSAG modulation input from power board to mainboard.
12 SPK O
Speech output, able to drive 8 ohm speaker. Transferred from mainboard to
power board
13 CH1 I
Programmable CH1
14 TXD O
TX data
15 CH2 I
Programmable CH2
16 CH3 I
Programmable CH3
17 CH4 I
Programmable CH4
18 GND I/O
GND
19 7.5V I
Power supply from power board to mainboard
20 7.5V I
Power supply from power board to mainboard