How to read COM port caption
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Parth-Raj Singh
le 1 Mar 2019
Commenté : Parth-Raj Singh
le 7 Fév 2022
I want to connect a device with multiple COM ports at different baud rate. However, every time I change HW or USB port, the COM port changes and I have to look into the device manager and then change COM ports in my script to make it work. However, I noticed that in the device manager the COM ports have captions which don't change with COM port number. I would like to know how can I automatically select the COM ports based on their captions.
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Abhishek Singh
le 5 Mar 2019
Hello Parth,
It is not possible to address the COM ports with the captions.
However as a work-around for this problem, before your actual code on your devices, you could continuously publish a particular value.
Simulink can search for these values across all COM ports and assign the COM ports accordingly.
For example, if you have an Arduino Uno and an Arduino Mega, you could publish '1' continuously from the Uno and '2' continuously from the Mega.
Simulink can sniff through all COM ports and look for a '1' or a '2', and assign the COM port to the device
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Madhu Govindarajan
le 5 Mar 2019
seriallist command is used to detect additions to the COM port #s (only available starting R2017a). However in this technique you are assuming that no other COM port devices gets added at the time of addition and you know the order in which you are adding the devices in. If these two can be guaranteed, then seriallist command output can be saved as a variable and see how it is changing and assign COM ports to appropriate devices based on the order.
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Parth-Raj Singh
le 21 Mar 2019
2 commentaires
chrisw23
le 4 Fév 2022
Modifié(e) : chrisw23
le 7 Fév 2022
asm = NET.addAssembly("System.Management");
mngmtQuery = System.Management.ObjectQuery();
mngmtQuery.QueryString = "SELECT * FROM Win32_PnPEntity WHERE Name LIKE '%(COM%'";
mngmtSearcher = System.Management.ManagementObjectSearcher(mngmtQuery);
mngmtObjColl = mngmtSearcher.Get();
comRep = repmat("",mngmtObjColl.Count,2);
enMngmtObjColl = mngmtObjColl.GetEnumerator;
i = 0;
while enMngmtObjColl.MoveNext()
i = i + 1;
com = enMngmtObjColl.Current;
caption = com.GetPropertyValue("Caption");
comRep(i,1) = string(caption).extract("COM" + digitsPattern);
comRep(i,2) = string(com.GetPropertyValue("Description"));
end
disp(comRep)
...works for me
Best regards
Christian
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