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Size of the output buffer in bytes


You configure OutputBufferSize as the total number of bytes that can be stored in the output buffer during a write operation.

An error occurs if the output buffer cannot hold all the data to be written. You write text data with the fprintf function. You write binary data with the fwrite function.

You can configure OutputBufferSize only when the serial port object is disconnected from the device. You disconnect an object with the fclose function. A disconnected object has a Status property value of closed.


Read only

While open

Data type



The default value is 512.