2 • Description
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2.5 Autosampler Control
The AS can be controlled locally, from the front panel keypad and display (see
Section 2.5.1
), or remotely, with a personal computer on which Chromeleon or
Chromeleon Xpress software is installed (see Section 2.5.2
). TTL input signals
from an integrator or other remote controller can also be used to control the AS.
See Appendix E
for details about TTL control.
2.5.1 Local Control
In Local mode, the AS receives commands from the front panel buttons
and screens. When the AS is powered up, it is always in Local mode.
When the AS is in Local mode, two types of control are available: Direct
and Schedule.
• In Direct control, you enter control commands and parameters on the
AS screens, and the AS executes the commands immediately.
• In Schedule control, you define a list of injections (a schedule) to be
run in sequence. The schedule can be defined, saved, and then run at a
later time.
The table below summarizes the AS Local control configurations:
Local/Direct Control Mode
You can directly control the following AS functions from the front panel:
• TTL and relay outputs
• Injection valve position
• Second injection valve position or diverter valve (if installed)
• Tray set point (if installed)
Operating/Control Mode Autosampler Operation
Local/Direct Control Commands are entered from the AS front panel
and executed immediately after being entered.
Local/Schedule Control Commands are entered from the AS front panel
and executed by running a schedule programmed
from the front panel.
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