Thermo Scientific Dionex Aquion RFIC Operator's Manual page 150

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TTL and Relay Control
TTL and Relay Connections
134 Dionex Aquion RFIC Operator's Manual
TTL Input Control Types
The Dionex Aquion RFIC TTL inputs respond to four types of signals. The default control
type, Normal Edge, is compatible with the output signals provided by the Dionex modules.
If the device connected to the Dionex Aquion RFIC does not send a normal edge signal, select
the appropriate control type. To select the correct control type, refer to both the
documentation provided with the controlling device and the information below.
Control 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.
The action of the positive (rising) edge depends on
the function:
• Load/Inject switches the injection valve to the
Inject position.
• Pump On turns off the pump (and suppressor).
• Autozero and Mark have no effect.
Inverted Edge: The inverted edge mode works
identically to the normal edge mode, except that the
positive and negative edges are reversed in function.
Normal Pulse: In normal pulse operation, the
negative (falling) edge of the TTL signal is the
active edge and the positive (rising) edge is ignored.
A pulse width of 50 ms or more is guaranteed to be
detected. A pulse width of 4 ms or less is guaranteed
to be ignored. The action for pulse widths that are
greater than 4 ms and less than 50 ms is undefined.
Inverted Pulse: The inverted pulse mode operates
identically to the normal pulse mode, except that
the positive and negative edges are reversed in
function.
Schematic
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