External Interfaces/API Reference

instrcallback

Display event information when an event occurs

Syntax

• instrcallback(obj,event)
  

Arguments

obj	An serial port object.
event	The event that caused the callback to execute.

Description

instrcallback(obj,event) displays a message that contains the event type, the time the event occurred, and the name of the serial port object that caused the event to occur.

For error events, the error message is also displayed. For pin status events, the pin that changed value and its value are also displayed.

Remarks

You should use instrcallback as a template from which you create callback functions that suit your specific application needs.

Example

The following example creates the serial port objects s, and configures s to execute instrcallback when an output-empty event occurs. The event occurs after the *IDN? command is written to the instrument.

• s = serial('COM1');
  set(s,'OutputEmptyFcn',@instrcallback)
  fopen(s)
  fprintf(s,'*IDN?','async')
  

The resulting display from instrcallback is shown below.

• OutputEmpty event occurred at 08:37:49 for the object: 
  Serial-COM1.
  

Read the identification information from the input buffer and end the serial port session.

• idn = fscanf(s);
  fclose(s)
  delete(s)
  clear s
  

get (serial)

instrfind