Waters 2690 - Controlled by Operate Gradient by Event in

12 Preparing the Separations Module for Operation
Refer to the Waters 2690 Separations Module Operator’s Guide , Section 5.2, Making
Automatic Runs Under Millennium Control, for details on making runs under Millennium
control.
Controlled by Operate Gradient by Event In
In the Operate Gradient by Event In mode, an external autosampler (a Waters 2700
Sample Manager, for example) signals the Solvent Management System of the
Separations Module to begin a gradient. In this mode, the Separations Module has no
control of IEEE-488 devices, however, the Separations Module
can control non-IEEE
devices using the I/O connections on the rear panel.
To set the Separations Module to the Operate Gradient by Event In mode:
1. Select the
System
field in the Configuration screen, then press
Enter
to display a
list of choices.
2. Select
Operate Gradient by Event In
, then press
Enter
.
3. Press the
Events In
screen key to display the Events In dialog box. If you need
more detailed steps on defining Events In conditions, refer to the
Waters 2690
Separations Module Operator’s Guide
,
Events In
discussion, Section 3.2.1,
Setting Configuration Parameters.
4. Set the Stop Flow field to the appropriate condition (
Ignore
,
High
, or
Low
), then
press
Enter
.
• Choose
Ignore
if the Stop Flow I/O terminals of the Separations Module are
not used.
• Choose
High
if the output connection from the external autosampler to the
Stop Flow I/O terminals of the Separations Module changes to a high (more
positive) TTL-level.
• Choose
Low
if the output connection from the external autosampler to the Stop
Flow I/O terminals of the Separations Module changes to a low (more negative)
TTL-level.
5. Set the Hold 1 field to the appropriate condition (
High
or
Low
), then press
Enter
.
• Choose
High
if the output connection from the external autosampler to the
Hold 1 Inject terminals of the Separations Module changes to a high (more
positive) TTL-level to initiate a chromatographic run (and prevent an injection by
the Separations Module).
• Choose
Low
if the output connection from the external autosampler to the Hold
1 Inject terminals of the Separations Module changes to a low (more negative)
TTL-level to initiate a chromatographic run (and prevent an injection by the
Separations Module).
Note:
If you are configuring the Separations Module with a Waters 2700 Sample
Manager, choose
Low
.