Thermo Scientific Dionex, Operator'S Manual

Page: 179 / 228

C • TTL and Relay Installation Instructions
Doc. 065250-06 03/2020
167
Assign TTL Input Control Types (Optional)
If you connected a TTL input, verify that the correct input action and
control type are selected. Select different settings, if necessary.
The SP TTL inputs respond to four types of signals. The default control
type,
Normal Edge
, is compatible with the output signals provided by
Dionex modules.
If the device connected to the SP does not send a normal edge signal,
follow the steps below to select the appropriate control type. To determine
the correct type, refer to the documentation provided with the controlling
device and to the information in
“TTL Input Control Types” on page 167 .
To select an input control type:
1. Open the Chromeleon 7 Instrument Configuration Manager.
2. Double-click the SP icon under the instrument name. The Properties
dialog box appears.
3. Click the TTL Inputs tab.
4. Select the name of the input and press the F2 key. The Device
Configuration dialog box for the TTL input appears.
5. Select the Mode and click OK .
TTL Input Control Types
•
Normal Edge : In normal edge
operation, the negative (falling)
edge of a signal turns on the
action.
The function of the positive
(rising) edge depends on the action: For actions that have two options
(for example, on/off), the rising edge turns off the action. However,
for functions with only one option, the rising edge has no effect.
For example, for the Bypass Streams , Panel Light , and Relay Out
actions, the action remains on as long as the TTL input is low. If the
input returns to high, the action is turned off. For example, if an
external device triggers a panel light, the light remains on as long as
the input is at 0 V (open). When the input returns to +5 V (closed), the