Thermo Scientific Dionex ICS-5000, Operator'S Manual

Page: 109 / 482

2 • DC Description
Doc. 065342-06 12/11
93
controlling device and the information below to determine the correct type.
Select the input control type in the Device Configuration dialog box for each
TTL input (see
Figure 2-38 ).
•
Normal Edge : In normal edge
operation, the negative (falling)
edge of a signal turns on the
function.
The action of the positive (rising)
edge depends on the function: For on/off or other functions that have two
options, the rising edge turns off the function. However, for functions with
only one option, the rising edge has no effect.
For example, for the injection valve position, the falling edge switches the
valve to Load and the rising edge switches the valve to Inject. Similarly,
for the
detector start/stop, the falling edge starts the detector and the rising
edge stops it. For the detector mark and offset functions, the falling edge
turns on the function and the rising edge has 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.
Action On
Action Off or No Effect
+5 V
+0 V
TTL
NORMAL
EDGE
Action On
Action Off or No Effect
+5 V
+0 V
TTL
INVERTED
EDGE
Action On Action Off
+5 V
+0 V
TTL
NORMAL
PULSE
Action On Action Off
+5 V
+0 V
TTL
INVERTED
PULSE