SR-FRS / SR110U Radio Module Programming

(pin to pin replace SA-818 Module)

My friend (W6IPA) and I developed a versatile Raspberry-Pi hat that can be used for Allstar, Echolink, APRS, or any digital modes.

We use the program in this GitHub repository to program the radio module SR-FRS or SR110U used for the Pi-Hat.

Before programming the SR-FRS SR110U module, make sure you consult the band plan for your country and transmit on a frequency you are allowed to use.

Intallation

$ git clone https://github.com/sp2ong/SRFRS

Example

[root@allstar ~]# python srfrs.py version
SRFRS: INFO: Firmware version: 110U-V223

[root@alarmpi SRFRS]# python srfrs.py radio --frequency 438.500
SRFRS: INFO: +DMOSETGROUP:0, RX frequency: 438.5000, TX frequency: 438.5000, squelch: 4, OK

[root@alarmpi SRFRS]# python srfrs.py radio --frequency 438.500 --offset -5
SRFRS: INFO: +DMOSETGROUP:0, RX frequency: 438.5000, TX frequency: 433.5000, squelch: 4, OK

[root@allstar ~]# python srfrs.py radio --frequency 145.230 --offset -.6 --ctcss 100
SRFRS: INFO: +DMOSETGROUP:0, RX frequency: 145.2300, TX frequency: 144.6300, ctcss: 100.0, squelch: 4, OK

[root@allstar ~]# python srfrs.py volume --level 5
SRFRS: INFO: +DMOSETVOLUME:0 Volume level: 5

If you use an FTDI dongle to program the SRFRS module the USB port can be specified with the --port argument

[root@allstar ~]# python srfrs.py --port /dev/ttyAMA0 volume --level 5
SRFRS: INFO: +DMOSETVOLUME:0 Volume level: 5

Usage

This program has for sections:

• radio: Program the radio's frequency, tone and squelch level
• volume: Set the volume level
• version: display the firmware version of the SR-FRS module

usage: srfrs [-h] [--port PORT] [--debug]
                {radio,volume,filters,version} ...

generate configuration for switch port

positional arguments:
  {radio,volume,version}
    radio               Program the radio (frequency/tome/squelch)
    volume              Set the volume level
    version             Show the firmware version of the SA818

optional arguments:
  -h, --help            show this help message and exit
  --port PORT           Serial port [default: linux console port]
  --debug

Radio

usage: srfrs radio [-h] --frequency FREQUENCY [--offset OFFSET]
                      [--squelch SQUELCH] [--ctcss CTCSS | --dcs DCS]

optional arguments:
  -h, --help            show this help message and exit
  --frequency FREQUENCY
                        Transmit frequency
  --offset OFFSET       0.0 for no offset [default: 0.0]
  --squelch SQUELCH     Squelch value (1 to 9) [default: 4]
  --ctcss CTCSS         CTCSS (PL Tone) 0 for no CTCSS [default: None]
  --dcs DCS             DCS code must me the number followed by [N normal] or
                        [I inverse] [default: None]

Volume

usage: srfrs volume [-h] [--level LEVEL]

optional arguments:
  -h, --help     show this help message and exit
  --level LEVEL  Volume value (1 to 8) [default: 4]

CTCSS codes (PL Tones 38 Sets)

67.0, 71.9, 74.4, 77.0, 79.7, 82.5, 85.4, 88.5, 91.5, 94.8, 97.4,
100.0, 103.5, 107.2, 110.9, 114.8, 118.8, 123.0, 127.3, 131.8, 136.5,
141.3, 146.2, 151.4, 156.7, 162.2, 167.9, 173.8, 179.9, 186.2, 192.8,
203.5, 210.7, 218.1, 225.7, 233.6, 241.8, 250.3

DCS Codes not support YET