How to read COM port caption

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Parth-Raj Singh
Parth-Raj Singh 2019-3-1
评论： Parth-Raj Singh 2022-2-7
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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采纳的回答

Abhishek Singh
Abhishek Singh 2019-3-5
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

更多回答（2 个）

Madhu Govindarajan
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.
Parth-Raj Singh
Parth-Raj Singh 2019-3-21
I found a solution using Python. Please find below the script:
function scpInfo=getSCPInfo
scpInfo=struct();
if isempty(seriallist)
error('SCP:InvalidSCP','No Serial Communication Port Detected.');
else
scpLis=py.serial.tools.list_ports.comports();
scpLisLen=size(scpLis,2);
if scpLisLen>0
scpInfo=repmat(struct(),[scpLisLen,1]);
for scpi=1:scpLisLen
fnSCP=sort(fieldnames(scpLis{scpi}));
for fnscpi=1:length(fnSCP)
scpInfo(scpi).(fnSCP{fnscpi})=char(scpLis{scpi}.(fnSCP{fnscpi}));
end
end
end
end
To run the above script, Python should be installed with pyserial package (pip install pyserial) and python location should be registered in the environment variable setting so that MATLAB can find it.
  2 个评论
chrisw23
chrisw23 2022-2-4
编辑：chrisw23 2022-2-7
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
Parth-Raj Singh
Parth-Raj Singh 2022-2-7
Thanks @chrisw23, it works for me as well and seems like a better solution.
BR,
Parth

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