User`s guide

Stackable Devices
Streaming I/O and Device Drivers 7-19
When you add an SIO stream in the Configuration Tool that uses a stacking
device, you must first enter a configured terminal device in the Device Control
Parameter property box. The name of the terminal device must be preceded
by a slash character ( / ). In the example we use /sineWave, where sineWave
is the name of a configured DGN terminal device. Then select the stacking
device (scale) from the dropdown list in the Device property. The
Configuration Tool will not allow you to select a stacking device in Device until
a terminal device has been entered in Device Control Parameter. The other
SIO streams created for Example 7-9 are outStreamSrc (output stream for
sourceTask), inStreamSink (input stream for sinkTask), and outStreamSink
(output stream for sinkTask). The devices used by these streams are the
terminal devices pip0 and printData.