PPC2 AF OPERATION AND MAINTENANCE MANUAL
© 1998 DH Instruments, Inc. Page 18
3.1.2 GENERAL OPERATING PRINCIPLES
3.1.2.1 MAIN KEYPAD LAYOUT AND PROTOCOL
The PPC2 AF has a 4 X 4 keypad for local operator access to direct functions,
function menus and for data entry.
1. The Function/Data keys allow very
commonly used functions to be
accessed directly by a single
keystroke when pressed from the
main run screen. The name of the
function is on the bottom half of the
key (see Section 3.2). These keys
enter numerical values when editing.
2. The Menu/Data keys provide access
to function menus when pressed
from the main run screen. The menu
name is on the bottom half of the
key. The SETUP menu is for more
frequently used functions (see
Section 3.3). The SPECIAL menu is
for functions that are not generally
used as a part of normal operation
(see Section 3.4). These keys enter
numerical values when editing.
3. The Editing and Execution keys are for causing execution, suspending execution, backing up
in menus and editing entries.
Keypad
The ENTER key generally causes execution or forward movement in the menu tree.
ENTER from the main run screen allows an automated pressure control
command to be given.
The ESCAPE key moves back in the menu tree and/or causes execution to
cease or suspend. Pressing ESCAPE repeatedly always eventually brings you
back to the main run screen and from there will allow a momentary viewing of the
PPC2 AF introduction screen.
The
key changes a numerical sign when editing. It also toggles through
multiple screens when available.
The
and keys allow reverse and forward cursor movement when editing
data entry.
Some screens go beyond the two lines provided by the display. This is
indicated by a flashing arrow in the second line of the display. Use the
and
→ arrow keys to move the cursor to access the lines that are not
visible or directly enter the number of the desired menu choice if you know it.
3.1.2.2 DIRECT PRESSURE CONTROL KEYS
Direct Pressure Control Keys
The direct pressure control keys provide direct manual control of pressure
increase, decrease and vent. They can be useful in adjusting pressure when
automated pressure control to a target value is not needed.
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