Matlab Fopen Serial Port Error
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Open Failed: Port: Com3 Is Not Available. No Ports Are Available.
ThingSpeak Anniversary Home Post A New Message Advanced Search Help MATLAB open failed: port: com4 is not available. no ports are available. Central Community Home MATLAB Answers File Exchange Cody Blogs Newsreader Link Exchange ThingSpeak Anniversary Home Post A New instrfind matlab Message Advanced Search Help Trial software Port: COM1 is not available Subject: Port: COM1 is not available From: Julio Cesar Date: 11 Apr, 2007 10:23:37 Message: 1 of 3
Matlab Serial No Ports Are Available
Reply to this message Add author to My Watch List View original format Flag as spam Hi all, I want to use the COM-Port to get serial data from a extern electronic. But on my PC in Matlab I don't get access to the port. The message is: ----------------- >> s = serial('COM1', 'BaudRate', 9600) ----------------- >> fopen(s)
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??? Error using ==> serial.fopen Port: COM1 is not available. Available ports: COM2. Use INSTRFIND to determine if other instrument objects are connected to the requested device. ----------------- >> fwrite(s, 1) ??? Error using ==> serial.fwrite OBJ must be connected to the hardware with FOPEN. ----------------- Serial Port Object : Serial-COM1 Communication Settings Port: COM1 BaudRate: 9600 Terminator: 'LF' Communication State Status: closed RecordStatus: off Read/Write State TransferStatus: idle BytesAvailable: 0 ValuesReceived: 0 ValuesSent: 0 --------------------- I try this command without sucess: >> s = serial('COM1') Serial Port Object : Serial-COM1 Communication Settings Port: COM1 BaudRate: 9600 Terminator: 'LF' Communication State Status: closed RecordStatus: off Read/Write State TransferStatus: idle BytesAvailable: 0 ValuesReceived: 0 ValuesSent: 0 >> fopen(s) ??? Error using ==> serial.fopen Port: COM1 is not available. Available ports: COM2. Use INSTRFIND to determine if other instrument objects are connected to the requested device. -------------------- >> instrfind Instrument Object Array Index: Type: Status: Name: 1 serial open Serial-COM1 2 serial closed Serial-COM1 3 serial closed Serial-COM1 4 serial open Serial-COM2 ----------
Support Answers MathWorks Search MathWorks.com MathWorks Answers Support MATLAB Answers™ MATLAB Central Community Home MATLAB Answers File Exchange Cody Blogs Newsreader Link Exchange ThingSpeak Anniversary Home Ask Answer Browse More Contributors Recent Activity Flagged Content matlab serial port Flagged as Spam Help MATLAB Central Community Home MATLAB Answers File Exchange Cody Blogs
Matlab Read Serial Port
Newsreader Link Exchange ThingSpeak Anniversary Home Ask Answer Browse More Contributors Recent Activity Flagged Content Flagged as Spam Help Trial software 2000rogers (view profile) 4 questions 1 answer 0 accepted answers Reputation: 0 Vote0 fopen() error with serial device Asked by 2000rogers 2000rogers (view profile) 4 questions 1 answer 0 accepted answers Reputation: 0 on 20 https://www.mathworks.com/matlabcentral/newsreader/view_thread/145681 Jun 2013 29 views (last 30 days) 29 views (last 30 days) Hi,under Linux we'd like to send a text string to a serial device:% --- code ---> >> s = serial('/dev/ttyS0');% a serial object s is returned>> set(s,'BaudRate',19200); % adjust the baudrate>> fopen(s)Error using serial/fopen (line 72) Open failed: Port: /dev/ttyS0 is not available. No ports are available. Use INSTRFIND to determine if other instrument objects are connected to https://www.mathworks.com/matlabcentral/answers/79681-fopen-error-with-serial-device the requested device.% the serial device is still there>> instrfind Serial Port Object : Serial-/dev/ttyS0 Communication Settings Port: /dev/ttyS0 BaudRate: 19200 Terminator: 'LF' Communication State Status: closed RecordStatus: off Read/Write State TransferStatus: idle BytesAvailable: 0 ValuesReceived: 0 ValuesSent: 0% --- code --- here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us http://stackoverflow.com/questions/21363693/no-ports-are-available-error-while-trying-to-read-data-from-com-port-in-matlab Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up No ports are available error while trying to serial port read data from COM port in Matlab up vote 1 down vote favorite I am trying to read data from the serial port of my laptop. The data is coming from the MSP430 through COM13. When I try to access the data through MATLAB, it says - ??? Error using ==> serial.fopen at 72 Port: COM13 is not available. No ports are available. Use INSTRFIND to determine if no ports are other instrument objects are connected to the requested device. Error in ==> interfaceplot at 3 fopen(s) The code I am using is this- s = serial('COM13'); %assigns the object s to serial port set(s, 'InputBufferSize', 128); %number of bytes in inout buffer set(s, 'FlowControl', 'none'); set(s, 'BaudRate', 9600); set(s, 'Parity', 'none'); set(s, 'DataBits', 8); set(s, 'StopBit', 1); set(s, 'Timeout',100); %clc; disp(get(s,'Name')); prop(1)=(get(s,'BaudRate')); prop(2)=(get(s,'DataBits')); prop(3)=(get(s, 'StopBit')); prop(4)=(get(s, 'InputBufferSize')); disp([num2str(prop)]); fopen(s); %opens the serial port data = fscanf(s); fclose(s); %close the serial port matlab serial-port share|improve this question edited Mar 20 at 15:25 Community♦ 11 asked Jan 26 '14 at 13:02 Swathi Sham 63 What is the output of INSTRFIND? –Daniel Jan 26 '14 at 13:56 Instrument Object Array Index: Type: Status: Name: 1 serial closed Serial-COM13 2 serial closed Serial-COM13 3 serial closed Serial-COM13 –Swathi Sham Jan 26 '14 at 16:58 Is this relevant? –Notlikethat Jan 26 '14 at 17:34 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote Usually as pointed out by matlab and the Commenter, instrfind looks for objects to use your serial ports. A radical way to close all of those (unwanted) connections is: fclose(instrfindall); d