LC Packings SWITCHOS II, User Manual

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The User Interface
3-4
D850R3
User’s Manual Switchos
The upper rear panel of the Switchos (FIGURE 3-4) includes the following:
SOLVENT SELECTION
Button
REMOTE/LOCAL
Switch
FIGURE 3-4 Control Elements on the Upper Rear Panel
• SSV (Solvent Selection Valves) Button – pressing the button will step to the
next solvent channel, from A to B, B to C, … and finally from D back to A.
• LOCAL/REMOTE Switch – used to select the control mode.
3.4 LOCAL Mode vs. Remote MODE
The control mode of the Switchos Advanced Microcolumn Switching Unit can be
set via the REMOTE/LOCAL switch on the rear panel (FIGURE 3-4):
LOCAL mode - when the REMOTE/LOCAL switch is set to LOCAL mode (the
switch is set to the upper or lower position), the unit can be controlled on a local
basis by the push buttons and switches on front and rear panel. Any change that
is made will override the present condition (regardless of whether it was set via
Local or Remote Control). When the unit is in LOCAL mode, the INPUTS
connector is disabled and the built-in LEDs in the push buttons are illuminated.
REMOTE mode - when the REMOTE/LOCAL switch is set to REMOTE mode (the
switch is in the middle position) the instrument is controlled by an external
device. In this mode, the INPUTS connector is enabled and the built-in LEDs and
the push buttons are deactivated The switching valves A and B will be positioned
according to the current signals of the INPUTS connector.
Note: If the instrument is in REMOTE control mode and the INPUTS connector
on the rear panel is not connected, switching valves A and B are “locked” in
position ‘1-2’.