External Interfaces

Debugging: Recording Information to Disk

While the serial port object is connected to the device, you can record this information to a disk file:

• The number of values written to the device, the number of values read from the device, and the data type of the values
• Data written to the device, and data read from the device
• Event information

Recording information to disk provides a permanent record of your serial port session, and is an easy way to debug your application.

You record information to a disk file with the record function. The properties associated with recording information to disk are given below.

Table 10-13: Recording Properties

Property Name	Description
RecordDetail	Specify the amount of information saved to a record file
RecordMode	Specify whether data and event information is saved to one record file or to multiple record files
RecordName	Specify the name of the record file
RecordStatus	Indicate if data and event information are saved to a record file

Example: Introduction to Recording Information

This example records the number of values written to and read from the device, and stores the information to the file myfile.txt

• s = serial('COM1');
  fopen(s)
  s.RecordName = 'myfile.txt';
  record(s)
  fprintf(s,'*IDN?')
  idn = fscanf(s);
  fprintf(s,'RS232?')
  rs232 = fscanf(s);
  

End the serial port session.

• fclose(s)
  delete(s)
  clear s
  

You can use the type command to display myfile.txt at the command line.

Controlling the Flow of Data: Handshaking

Creating Multiple Record Files

© 1994-2005 The MathWorks, Inc.