User's Manual

Shenzhen Friendcom Technology Development Co., Ltd.

Figure T2: User activate the modem launching 01 code or PN9 code by TRS pin.

Debugging method-1

Connect the devices according to the figure T1 shows. The VFF (Voice Frequency Filter) should be

programmed as 20Hz-15KHz. DC power supply provide a voltage of 12V/2A. A serial debugging software

sends the AT command to the radio.

Serial port settings：4FSK：9600/19200, 8N1。

AT command

FC-302-4FSK

Remark

AT+TEST=CODE01/r

send code 01

Used for deviation

adjustment of the

4FSK modem

AT+TEST=EXIT/r

Quit from the test

AT+WORKMODE=?/r

Data rate query

AT+WORKMODE=M9600/r

Program the data

rate as 9600bps

Debugging method-2

The second method is easy to conduct. But the channel and coupling mode. The radio should be under

wide band channel spacing for frequency deviation calibration.

Debugging：

Connect the devices according to the figure T2, SW (Switch) is connected between the STS (Pin 12) and

GND.

Close the SW in 30 seconds after the radio is powered up. Then the radio starts to transmit. User adjust the

frequency deviation to 3.3-3.5KHz by adjusting VR2 and reading the deviation value

Comprehensive tester

DC power supply

Radio