Instrument Control Toolbox

Event Types and Action Properties

The event types and associated action properties supported by serial port objects are listed below.

Table 5-5: Serial Port Event Types and Action Properties  

Event Type	Associated Properties
Break interrupt	BreakInterruptAction
Bytes available	BytesAvailableAction
	BytesAvailableActionCount
	BytesAvailableActionMode
Error	ErrorAction
Output empty	OutputEmptyAction
Pin status	PinStatusAction
Timer	TimerAction
	TimerPeriod

The break-interrupt and pin-status events are described below. For a description of the other event types, refer to Event Types and Action Properties.

Break-Interrupt Event.   A break-interrupt event is generated immediately after a break interrupt is generated by the serial port. The serial port generates a break interrupt when the received data has been in an inactive state longer than the transmission time for one character.

This event executes the action function specified for the BreakInterruptAction property. It can be generated for both synchronous and asynchronous read and write operations.

Pin-Status Event.   A pin-status event is generated immediately after the state (pin value) changes for the CD, CTS, DSR, or RI pins. Refer to Serial Port Signals and Pin Assignments for a description of these pins.

This event executes the action function specified for the PinStatusAction property. It can be generated for both synchronous and asynchronous read and write operations.

Using Events and Actions

Storing Event Information