Shenzhen Friendcom Technology Development Co., Ltd.
24
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
：
GMSK/9600 modem
，
9600, 8N1
。
AT command
FC-302-GMSK
Remark
AT+TEST=PN9/r
send PN9 code
Used for deviation
adjustment of the
GMSK modem
AT+TEST=CODE01/r
send code 01
AT+TEST=EXIT/r
Quit from test
AT+WORKMODE=?/r
Data rate query
AT+WORKMODE=M9600/r
-----
As for GMSK modem, the radio need to be programmed as AC coupling (Low speed mode) and start to send
PN code. Then user can adjust the frequency deviation to 3.3-3.5KHz by adjusting VR2 and reading the
deviation value on comprehensive test instrument.
Note: user can set the parameters of the radio via modem’s external serial port (TXD/RXD) by our
PC software(FC-302 QuickSet En v0.1.11.exe)
The debugging is the same with the GMSK modem. But the sending code is 01.
Debugging method-2
Comprehensive tester
DC power supply
Radio
