FC-302 Data Radio User Manual
Power board connect to external interface（J101--DB9 or DB15）
No. Name Type Description
1 BUSY O
BUSY detect output, Sent from mainboard to power board. The default output
low level. Also able to work as simulated serial and data transmission port.
2 AUDIO_IN I Audio input, Modulation sensitivity is 100mW
3 RXD I RX data
4 MIC_IN/RSSI I/O
Microphones signal input. Modulation sensitivity is 10mW. A jumper in
power board can be defined as received field strength signal.
5 AUDIO_OUT O Audio output, 100mW, transferred from mainboard to power board
6 CH1 I Programmable CH1
7 SWITCH I Programmable switch, configurable specific function options
8 PTT I TX control, low level when transmitting from power board to mainboard.
9 CH2 I
Programmable CH2
10 SPK/POCSAG O/I
Speech output, able to drive 8 ohm speaker, a jumper in power board can be
defined as POCSAG modulation input port
11 GND I/O
GND
12 CH3 I
Programmable CH3
13 TXD O
TX data
14 +12V I
+12V，supply power for whole radio
15 CH4 I
Programmable CH4
V23 modem connect to external interface (CON1---DB15)
No. Name Type Description
1 GND I/O GND
2 RXD I RX Data
3 EXT_PTT I TX control. Low level: modem in TX status
4 TXD O TX Data
5 CD_OUT O Carrier detect control. Default output low level when receiving carrier
6～11、13 NC -- Not used
12 GND I/O GND
14 +12V I Power supply input
4 Features
4.1 Power Save Mode
When user enable power save mode, the radio will work into beat status to save the energy. If detect useful
signal, the radio will start to work normally. If no useful signal detected, the radio will get into beat status.
Heartbeat interval can be programmed via PC. However, real time communication will be slightly affected.
4.2 CTCSS/DCS
When enabled, receiver only can receive useful RF signal with the same CTCSS/DCS code of the
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