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Determining Clone/Serial Port Baudrate

A project log for Reverse Engineering The Midland WR120-EZ

Attempting to re-band the radio into the ham band as well as develop a tool for backup and restore via serial using the built-in clone port.

Signals Everywhere/KR0SIVSignals Everywhere/KR0SIV 07/20/2017 at 03:370 Comments

She speaks serial! Let's hook it up to a UART.

Once I have the radio hooked up to a UART I attempt several times to capture data, unable to find the correct baudrate.

RealTerm - Guessing BaudrateHaving a hard time guessing the baudrate

Alright maybe there is a better way....

I found this website online and it worked out quite nicely.. https://www.kumari.net/index.php/random/37-determing-unknown-baud-rate

Baudrate / Oscilloscope Chart
Using my Oscilloscope I was able to measure the shortest burst as suggested in the above link/website. This gave me a reading of about 800.0us in width which should round out to about 1200 baud.

Does she look good now?

Serial DumpCaptain, we haz data!


Data obtained from clone

[17/07/2017 19:26:00] Read data (COM4) 
    ee 07 90 03 85 90 03 35 90 03 55 90 03 55 91 03   î..….5.U.U‘. 
    aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa   ªªªªªªªªªªªªªªªª 
    aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa   ªªªªªªªªªªªªªªªª 
    aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa   ªªªªªªªªªªªªªªªª 
    aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa aa   ªªªªªªªªªªªªªªªª 
    aa aa aa aa aa aa aa aa aa aa aa 2d 2d 2d 2d 2d   ªªªªªªªªªªª----- 
    2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 00 2d 2d 2d 2d 2d   ----------.----- 
    2d 2d 2d 2d 2d 2d 00 2d 2d 2d 2d 2d 2d 2d 2d 2d   ------.--------- 
    2d 2d 00 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 00 2d   --.-----------.- 
    2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 00 2d 2d 2d 2d 2d   ----------.----- 
    2d 2d 2d 2d 2d 2d 00 67 f9 71 ff 3b fe f0 03 00   ------.gùqÿ;þð.. 
    02 02 02 02 02 02 ff ff 00 03 26 06 00 07 b2 b1   ......ÿÿ..&...²± 
    ff c0 ff ff ff ff ff ff ff ff ff ff ff ff ff ff   ÿÀÿÿÿÿÿÿÿÿÿÿÿÿÿÿ 
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff   ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ 
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff   ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ 
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 64   ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿd 
    5a                                                Z                
[17/07/2017 19:26:04] Read data (COM4) 
    05                                     

Alright! We're not off to a bad start.

Stay tuned for more.

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