Use the 35900E Event Configuration dialog to assign a TTL I/O state to a selectable action in the method editor event table. Only configured events can be selected in a method.
Each 35900E channel has a dedicated TTL I/O connector with 16 signal lines. Of the 16, eight are bidirectional configurable as inputs or outputs (for such functions as valve control) and the remaining eight lines are input-only signals, not supported by the data system. Eight TTL I/O signals are assigned to channel A and eight are assigned to channel B. Each of the channel’s 8 bidirectional TTL I/O line states can be controlled by the data system methods using the event table.
By marking the pin check box, you are enabling a data system method to remotely control the state of the TTL I/O signal attached to this pin. When a data system event requests a high TTL state, the wire attached to this marked pin number maintains a high voltage output signal. When an event requests a low TTL state, the wire attached to this marked pin number maintains a low voltage output signal. An external device monitoring this signal wire can, for example, open a valve when it receives a high voltage signal and close the valve when it receives a low voltage signal.
For each enabled pin, provide a unique descriptive label for the operational states of the external device in both the High and Low TTL I/O states. These labels are used to describe the available events in the drop-down list of the method’s event table. For example, a high state label of "sample valve open" and a low state label of "sample valve closed" could be used to describe The data system can trigger these events at a time relative the 35900E channel’s start run time.