variable = Bfree(channel, bufferType

This function will return the number of free bytes in a receive or send buffer. When sending data, this command can be used to avoid overflowing the buffer. When receiving data, this command can help the program wait for a specified amount of data to be received before taking action.

Dim A As Byte
OpenCom 1,19200,0, 100, 50
If Bfree(1,1)>10 Then
     Put "TECHNOLOGY"
End If

If the size of the buffer is set to 50, up to 49 bytes can be returned. When the buffer is empty, Bfree will return 1 less than the buffer size.

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