Instrument Control Toolbox

stopasync

Stop asynchronous read and write operations

Syntax

• stopasync(obj)
  

Arguments

obj	An instrument object or an array of instrument objects.

Description

stopasync(obj) stops any asynchronous read or write operation that is in progress for obj.

Remarks

You can write data asynchronously using the fprintf or fwrite functions. You can read data asynchronously using the readasync function, or by configuring the ReadAsyncMode property to continuous (serial port, TCP/IP, UDP, and VISA-serial objects). In-progress asynchronous operations are indicated by the TransferStatus property.

If obj is an array of instrument objects and one of the objects cannot be stopped, the remaining objects in the array are stopped and a warning is returned. After an object stops,

• Its TransferStatus property is configured to idle.
• Its ReadAsyncMode property is configured to manual (serial port, TCP/IP, UDP, and VISA-serial objects).
• The data in its output buffer is flushed.

Data in the input buffer is not flushed. You can return this data to the MATLAB workspace using any of the synchronous read functions. If you execute the readasync function, or configure the ReadAsyncMode property to continuous, then the new data is appended to the existing data in the input buffer.

See Also

Functions

fprintf, fwrite, readasync

Properties

ReadAsyncMode, TransferStatus

spoll

tcpip