MODBUS communication for the controlling of peristaltic pump,

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Kang Soo Lee
Kang Soo Lee 2019-5-31
评论： Kang Soo Lee 2021-2-6
Hi,
I am working on the MODBUS communication to control my peristaltic pump. I am using the following code:
peri_pump = serial('COM7');
set(peri_pump,'BaudRate',9600,'DataBits',8,'StopBits',1,'Parity','Even','Timeout',10);
fopen(peri_pump);
% start the pump
request = uint8(hex2dec(['01'; '06'; '03'; 'F0'; '00'; '01'; '48'; '7D']));
fwrite(peri_pump, request);
% stop the pump
request = uint8(hex2dec(['01'; '06'; '03'; 'F0'; '00'; '00'; '89'; 'BD']));
fwrite(peri_pump, request);
% set the flow rate 50 ml/min
request = hex2dec(['01'; '10'; '03'; 'EC'; '00'; '02'; '04'; '42'; '48'; '00'; '00'; '7D'; '2C']);
fwrite(peri_pump, request);
fclose(peri_pump)
'start' and 'stop' commands are working, however 'set the flow rate' is not working (nothing happens). In the manufacturer's instruction (link; page 5), 'start/stop' uses 'unsigned short int format' and 'set the flow rate' uses 'float format'. Anyone knows how to make 'set the flow rate' work? Any input would be appreciated.
Thanks!
Kang

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Gustavo Dacanal
Gustavo Dacanal 2019-6-3
Dear Kang,
I will reccomend you try to send the hex command using "SimpleModbus software" and verify if your pump is regulating and working well.
If you get a satisfatory pump command with SimpleModbus but your matlab code still not working, then, you could try to insert the matlab commands fread and/or fclose after an input fwrite. *you will need to open the COM port every time you close it.
Tell me if you get any progress.
Regards
Gustavo
  1 个评论
Kang Soo Lee
Kang Soo Lee 2021-2-6
Sorry for being late! I decided to use only "on" and "off" functions, as I did not need to frequently change the flow rate. But, your reply inspired my curiosity. I will check and see if your suggestion works. When I have an update, I will write again in this post for future users.
Thank you!
Best regards,
Kang

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