INFICON STM-1 LabView Manual - Manual (Page 6)

1.6 Analog Output Tab
The STM-1 is equipped with an Analog Output feature that is capable of producing a voltage of approximately zero to ten (0-10)
volts, varying slightly between units.
On the Analog Output tab there is a slide control and a set button. The user can adjust the voltage using the VOLTAGE slider or
digital indicator. If the TRACK button is depressed, the VI will automatically update the STM-1 at the port and address indicated
on the CONFIGURE tab continuously. The TRACK button should then be clicked to the off position and the STM-1 will
maintain that voltage. Alternately, the VOLTAGE SLIDER can be moved without changing the output voltage of the STM-1 if
the TRACK button is off. In this case, the output voltage can be set to a new value by pressing the SET button. This is more
useful in an instance where a specific, known output voltage is desired, and it is desirable to transition between the current voltage
and that new output as quickly as possible.
The STM-1 is equipped with a safety watchdog feature on the Analog Output. This feature will return the output voltage to 0% if
the watchdog has not been “tickled” in more than 5 seconds. Under normal operation, the VI will tickle the watchdog
approximately once per second, but be aware that if something in your system (loading another application, checking email, etc.)
starves it of adequate bandwidth to perform this task, the output voltage will drop to 0%, and your VI will still be displaying its
former voltage.
It is also important to note that unlike density and tooling settings, which can be kept separate on different SLAVE ADDRESS or
COM PORT numbers, only one STM-1 can be given an output voltage at a time. If SLAVE ADDRESS or COM PORT is
changed to correspond to a second STM-1, the watchdog of the first will time out. If the TRACK button is depressed, the second
unit will begin to output the specified voltage.
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