Keypad Control Functions - MTS Systems Level Plus Operation And Installation Manual

7

Keypad Control Functions

During measurement mode the keypad allows the user to control the different display modes
supported by the Level Plus Monitor software. In addition, the user can use the keypad to over-
ride the default scan order and access individual tank gauge measurement data directly. This sec-
tion describes the key functions that are currently supported.
In measurement mode, the Level Plus software defaults to a sequential scan order based on the
tank gauges currently programmed in the system. Direct access to tank data is accomplished by
depressing the numeric key corresponding to the tank number. For example, tank #6 data can be
called to the LCD screen by depressing the numeric "6" key. The data will be displayed for three
seconds and then the DISPLAY processor will automatically go back to scan mode. If the data
requires viewing for longer periods, the DISPLAY scan hold function can be activated. This is
done by first depressing a tank # and then depressing the numeric "9" key within three seconds.
DISPLAY scan hold is indicated by two moving asterisks on the fourth line of the LCD display.
See example screen below.
During DISPLAY scan hold, other tanks can be called to the screen by depressing their respective
numeric key. The DISPLAY scan hold function is deactivated by depressing the "9" key again,
causing the display processor to default back to sequential scan mode.
The hardware SCAN processor can also be controlled by the keypad, allowing the hardware
SCAN to be fixed on a selected tank gauge. This forces continuous updates for the currently
selected gauge.
The hardware SCAN hold function is activated by first depressing a tank # and then depressing
the "+/-" key within three seconds. A warning message is then displayed indicating that the auto-
matic hardware SCAN processor has been disabled. See example screen below.
18
T A N K # 1 :
I N T E R :
T E M P :
*
Moving asterisks (on screen) indicate
DISPLAY scan hold is active
Level Plus Screen - DISPLAY SCAN HOLD ACTIVE
CAUTION
When the hardware SCAN hold function is active,
processing of all other gauge data (other than the
selected gauge) is suspended. The system will display
a warning message when the hardware SCAN hold
function is activated.
W A R N I N G ! ! !
A U T O M A T I C S E N S O R
S C A N H A S B E E N
D I S A B L E D
Level Plus Screen - HARDWARE SCAN HOLD WARNING MESSAGE
9 6 . 6 6 7 i n .
2 . 6 6 7 i n .
7 2 . 0 °F
*