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Dionex ED50A Electrochemical Detector
D.3 TTL Input Operation
D.3.1
TTL Input Signal Modes
The Dionex ED50A TTL inputs respond to four types of signals to
accommodate different types of device output signals. The default signal
mode, normal edge, is compatible with the output signals provided by
Thermo Scientific Dionex modules. If the device connected to the Dionex
ED50A outputs a different signal type, select the appropriate signal mode
from the
TIME FUNCTION IN
SUPPRESSOR
METHOD NUMBER INCR:
Help Message
The four input signal modes are:
•
•
•
D-4
TIME FUNCTION IN
MODE:
OFFSET:
HOLD/RUN:
ON/OFF:
MARK:
RANGEx10:
Figure D-3. Time Function In Screen
Normal Edge: In normal edge operation, the negative (falling) edge of
a signal turns on the function and the positive (rising) edge turns off
the function (see Figure D-4).
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.
The minimum pulse width guaranteed to be detected is 50 ms. The
maximum pulse width guaranteed to be ignored as noise or invalid is
4 ms. The action of the Dionex ED50A is undefined for pulses less
than 50 ms or greater than 4 ms.
screen (see Figure D-3).
NORMAL EDGE
TTL
1
TTL
2
TTL
3
CELL:
TTL
4
DE
CR:
TTL
-
TTL
-
T
T
L
-
T
T
L
-
Doc. 065551-01 6/13
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