i can not read data from serial

the program is design as follow:

g=serial('com5')
set(g,'baudrate',38400)
g.inputbuffersize=131072
g.outbuffersize=5120
g.outputbuffersize=5120
g.timeout=30
g.readasyncmode='continuous'
g.bytesavailablefcnmode='byte'
g.bytesavailablefcncount=48
g.terminator='cr'
fopen(g)
fread(g,4,'uint16')

com5 is ready,but

Warning: The specified amount of data was not returned within the Timeout period. 

 I cannot read the data ,please help me

the parameter of g is:

 g
   Serial Port Object : Serial-COM5
   Communication Settings 
      Port:               COM5
      BaudRate:           38400
      Terminator:         'LF'
   Communication State 
      Status:             open
      RecordStatus:       off
   Read/Write State  
      TransferStatus:     idle
      BytesAvailable:     0
      ValuesReceived:     0
      ValuesSent:         1

[Raju Purohit]

Most possibly because there isn't any data being received.

[Chago Rodriguez]

MuDondong,

How did you resolved your issue. I have the same problem.

Thanks!

Chago

Answer 1

[Mu dongdon]

when com5 is connected correctly, I use others soft to read data successfully, but I cannot use matlab read it,how can i do?

 The data consists of four bytes， a byte is used as data start, expressed with 'FF', the other three is data， they are all hexadecimal