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C • TTL and Relay Control
Doc. 065291-01 3/09 243
To select TTL input functions and the control type from the touch screen,
go to the
INPUT/OUTPUT touch screen page (see Figure C-4).
TTL Input Control Types
The ICS-2100 TTL inputs respond to four types of
signals to accommodate different controlling devices.
The default control type,
Normal Edge, is compatible
with the output signals provided by Dionex modules.
If the device connected to the ICS-2100 does not send a normal edge
signal, select the appropriate control type. Refer to the documentation
provided with the controlling device and the information below to select
the correct type.
• Normal Edge: In normal edge
operation, the negative (falling)
edge of a signal turns on the
function. For example, for the
Load/Inject function, the
negative edge switches the
injection valve position to Load.
Figure C-4. Input/Output Page: Selecting TTL Functions
Select a
Function
Select a
Control
Type