Troubleshooting bluetooth over serial

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Raymond Chiu 2015년 10월 26일

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https://kr.mathworks.com/matlabcentral/answers/251127-troubleshooting-bluetooth-over-serial

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The exercise is to retrieve the model number of a Bluetooth device.

Win10 Bluetooth connection:

Not sure why serial port object s7 fails to fopen. Any actionable suggestions or diagnostic questions are appreciated.

>> s6 = serial('COM6', 'BaudRate', 9600);
>> s7 = serial('COM7', 'BaudRate', 9600);
>> s6
     Serial Port Object : Serial-COM6
     Communication Settings 
        Port:               COM6
        BaudRate:           9600
        Terminator:         'LF'
     Communication State 
        Status:             closed
        RecordStatus:       off
     Read/Write State  
        TransferStatus:     idle
        BytesAvailable:     0
        ValuesReceived:     0
        ValuesSent:         0
>> s7
     Serial Port Object : Serial-COM7
     Communication Settings 
        Port:               COM7
        BaudRate:           9600
        Terminator:         'LF'
     Communication State 
        Status:             closed
        RecordStatus:       off
     Read/Write State  
        TransferStatus:     idle
        BytesAvailable:     0
        ValuesReceived:     0
        ValuesSent:         0
>> fopen(s6)
>> fopen(s7)
Error using serial/fopen (line 72)
Open failed: Port: COM7 is not available. Available ports: COM3.
Use INSTRFIND to determine if other instrument objects are connected to the requested device.
>> fopen(s7)
Error using serial/fopen (line 72)
Open failed: Port: COM7 is not available. Available ports: COM3.
Use INSTRFIND to determine if other instrument objects are connected to the requested device.
>> s6
     Serial Port Object : Serial-COM6
     Communication Settings 
        Port:               COM6
        BaudRate:           9600
        Terminator:         'LF'
     Communication State 
        Status:             open
        RecordStatus:       off
     Read/Write State  
        TransferStatus:     idle
        BytesAvailable:     0
        ValuesReceived:     0
        ValuesSent:         0
>> s6
     Serial Port Object : Serial-COM6
     Communication Settings 
        Port:               COM6
        BaudRate:           9600
        Terminator:         'LF'
     Communication State 
        Status:             open
        RecordStatus:       off
     Read/Write State  
        TransferStatus:     idle
        BytesAvailable:     0
        ValuesReceived:     0
        ValuesSent:         0
>> fprintf(s6, '*IDN?')
Error using serial/fprintf (line 144)
Unexpected error: A timeout occurred during the write operation..
>> fopen(s7)
Error using serial/fopen (line 72)
Open failed: Port: COM7 is not available. Available ports: COM3.
Use INSTRFIND to determine if other instrument objects are connected to the requested device.