Discussion between tlfong01 and Adrian Maire

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2:39 PM

Ah, the following three things you found out is very important, should save me a lot of time doing trials and errors: (1) Reading and testing about UART, it transmit 10bits for each (8bit) byte of data: (2) First it transmit a "10" and then the data.
(3) Also, it transmit first the less significant bits and after the most. But I don't seem to find this protocol in the LewanSoul command user guide. I need to read the guide one more time and update my summary shown below。

I am also considering the test command strings I should try use first. I found you use of the broadcast address 0xfe a bit confusing. I need to think again to see 0xfe is a good address to test. I am studying the following to get to know more.

I think the simplest commands I might try first is 0x26, 0x27, and 0x28, (1) Read Temperature, (2) Read Vcc, and (3) Read Position (I can move the servo by hand and see if Position changes).

For your suggestion on testing the offline tester board, let me make some comments first.

(1) The BusLinker V2.4 is for old version LX-16A, so it says Vin = 6V ~ 8.4V, so there should be no problem if I set Vin to 8V and send a rotate commend. I will do that later, but as you have guessed, the logic output should be 5V. Anyway, I will try that and let you know if your guess if correct.

You said my screen capture is "x55 x55 x01 x03 x1B xE0". I need to read the command table to see what this means, but I will also try to use my terminal emulator Win10 RealTerm, or RpiCuteCom, or Rpi python to send this string, and also your decoded command "10-10101010 10-10101010 10-10000000 10-11000000 10-11011000 10-00000111" and see what happens. I will also try read temperature, Vin, and Pos as I suggested earlier.

Ah, bed time. Call it a day. See you tomorrow. Cheers.

You said perhaps the following: "The servo expect 12V signal (HV version)". I think this is very unlikely, but I will, as you suggest, try Vin = 8V and see what happens. Anyway, will carry on tomorrow. Cheers.