Display; Keyboard/Display Interface Electronics; Figure 10-21: Keyboard And Display Interface Block Diagram - Teledyne 100E Instruction Manual

Theory Of Operation

10.6.1.3. Display

The main display of the analyzer is a vacuum florescent display with two lines of 40 text
characters each. Information is organized in the following manner (see Figure 10-20):
Mode Field: Displays the name of the analyzer's current operating mode.
Message Field: Displays a variety of informational messages such as warning messages,
operation data and response messages during interactive tasks.
Concentration Field: Displays the actual concentration of the sample gas currently being
measured by the analyzer
Keypad Definition Field: Displays the definitions for the row of keys just below the
display. These definitions dynamic, context sensitive and software driven.

10.6.1.4. Keyboard/Display Interface Electronics

Key Press
Detect
Keypad
Decoder
Serial
Data
Sample LED
(Green)
Cal LED
(Yellow)
Fault LED
(Red)
KEYBOARD

Figure 10-21: Keyboard and Display Interface Block Diagram

The keyboard/display interface electronics of the M?00E Analyzer watches the status of
the eight front panel keys, alerts the CPU when keys are depressed, translates data from
parallel to serial and back and manages communications between the keyboard, the CPU
and the front panel display. Except for the Keyboard interrupt status bit, all
communication between the CPU and the keyboard/display is handle by way of the
192
2
I C Interface
Maint.
Switch
2 nd Lang.
Switch
Beeper
Model 100E Instruction Manual
Display Data Display
Decoder Controller
2 x 40 CHAR. VACUUM
FLUORESCENT DISPLAY
FRONT PANEL
2
I C to Relay Board
Display Power
Watchdog
From 5 VDC
Power Supply
Optional
Maintenance
LED
045150102 Rev XB1