User`s guide

Introduction to DX LCD Display 2-3
• Indicates alarms both visually and audibly.
• Maintains an Alarm Summary of points currently in an alarm state.
• Maintains an Alarm Log of the last 96 alarm and return-to-normal
Changes-of-State (COSs) with time and date stamp. For the Alarm
Log feature to operate as described, the DX LCD Display must be
permanently connected to one DX controller.
• Displays Trend Data collected in the DX controller (if supported
by the controller).
• Allows you to define and change Time Schedule parameters.
• Allows you to define and change Optimal Start/Stop parameters.
• Allows you to set the system clock, date, and daylight saving
times.
• Includes sealed membrane keypad.
• Provides backlit, 240 by 128 pixel Liquid Crystal Display (LCD)
(equivalent to 16 lines of text with 40 characters per line).
• Displays graphical Home Pages with selected ‘live’ data that can
be customized according to Original Equipment Manufacturer
(OEM) or end user requirements.
• Allows use of the DX LCD Display as either a portable, hand-held
device or permanently mounted in a panel or on the wall. A wire
stand pulls out of the back of the display to set it at an angle on a
table top or hang it on a door panel during portable operation.
Theory of Operation
The DX LCD Display works with the DX-9100 (Version 2.0 or later)
and DX-9120 Series of digital controllers. The display connects
directly to the built-in RS-232 serial port of the DX controller,
allowing easy access to all of the system functions available at the
user’s password level.
A DX LCD Display unit with an earlier firmware version (2.x) can
communicate directly with one DX controller by a direct connection,
but not via the N2 Bus. The DX LCD Display with firmware starting
from Version 3 can use an RS-232/RS-485 converter (with plug
adapter) to communicate, via the N2 Bus, with one of up to eight DX
controllers working in standalone mode (that is with no supervisory
system monitoring the N2 Bus).
The DX LCD Display is operated through a keypad and menu system
to provide access to the data and parameters stored in the DX
controller.