SThreshold

Sets or Retrieves the minimum number of bytes in the transmit buffer below which an OnComm event is raised.

Available at design time and runtime.

MSComm32 and Comm64 have the same behavior

Syntax object.SThreshold = value     object Name of the communications control.   value A numeric expression indicating the SThreshold number of bytes     Example object.SThreshold = 0 '// No OnComm events will be raised.             object.SThreshold = n '// During transmission an OnComm event will be raised '// when less than n bytes remain in the transmit buffer.             n = object.SThreshold '// Retrieves the current setting/value

Remarks:

If this value is set to a value larger than zero then the control will raise an OnComm (evSend) event when the number of bytes remaining in the transmit buffer falls below that number.

When using event driven communications you can program your application to fill up the transmit buffer and then continue with other processing while the data is sent by the Comm64 component in the background. Comm64 will raise an OnComm (evSend) event to tell you when less than this many bytes remain in the transmit buffer - you would respond to this event by using the Output property to queue more data into the transmit buffer.

We'd recommend using only values of 0 or 1 which would simply prevent or allow the firing of OnComm evSend events.