Sending hex from matlab to longer pump device
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Hello everybody
First of all, I am a beginner in communication protocols
I recently started to try to control LongerPump BT1002J with matlab. I'm able to control it with a special software (pictures 1), everything works

I would like to use Matlab to be able to send the same thing to my device, but I think the format of the pin in not correct and the pump seems to not understand what I am sending to it.
I used the folowing code:
clear all
instrreset
s = serialport('COM6',1200);
fopen (s)
Str = 'E9 01 06 57 4A 00 0A 01 01 10';
D = sscanf(Str, '%2x');
fwrite(s, D, 'uint8')
I tried to remove blanks between E9 01 etc, but it is not effective. The line is sent ( I can see it with my RS485 converter, the led lights up.
Can anyone could correct the mistake in this code please?
Thank you for your help
10 件のコメント
Walter Roberson
2023 年 3 月 7 日
Well, let us do a test:
Str = 'E9 1F 06 57 4A 00 0A 01 01 0E';
D = sscanf(Str, '%2x').'
filename = tempname + ".txt";
%write process you are using now
fid = fopen(filename, 'w');
fwrite(fid, D, 'int8');
fclose(fid);
fid = fopen(filename, 'r');
stored = fread(fid, [1 inf], 'uint8');
fclose(fid);
disp(stored)
%write process with greater certainty
D2 = typecast(uint8(D), 'int8');
fid = fopen(filename, 'w');
fwrite(fid, D2, 'int8');
fclose(fid);
fid = fopen(filename, 'r');
stored = fread(fid, [1 inf], 'uint8');
fclose(fid);
disp(stored)
This suggests that your use of write() with 'int8' is equivalent to first doing int8(D) and writing the result -- which is not going to work because some of your values are greater than 127. The type specification you use in write() or fwrite() does not do a typecast() of the data, it does a cast() of the data
採用された回答
Daniele Sportillo
2023 年 3 月 21 日
移動済み: Walter Roberson
2023 年 3 月 30 日
Hi,
this should work
s = serialport('COM8',1200,'Parity','Even','DataBits',8,'StopBits',1); %open the serial port
Str = 'E9 1F 06 57 4A 00 0A 01 01 0E';
D = sscanf(Str, '%2x').';
write(s,D,"uint8");
その他の回答 (2 件)
JOUDI ARMOUCH
2023 年 5 月 19 日
If its possible, can I know which software you used in picture 1?
5 件のコメント
JOUDI ARMOUCH
2023 年 6 月 15 日
Thank you for your answer and time, really appreciated..
I have a project related to this type of longerPump, if you do not mind can I have a way to communicate with you and ask some questions.
Florian Mueller
2023 年 7 月 11 日
Dear Mathieu,
I also try to use a Longer pump ... and failed.
Would you mind sharing what software you used (and maybe you have a better user manual than I found).
Thanks a lot already!
5 件のコメント
Florian Mueller
2023 年 7 月 18 日
Mathieu, THANK YOU.
Thanks to this thread and all the replies, I finally managed to get this to work ... Longer pumps are nice and cheap, but the documentation is not very clear.
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