![background image](http://html.mh-extra.com/html/omron/nt21/nt21_setup-manual_744541199.webp)
Appendix A
Specifications
188
Performance Specifications
Display Specifications
Item
Specification
Display device
Monochrome STN LCD (with backlight)
Number of dots (resolution)
260 dots horizontally
140 dots vertically
Dot pitch
0.45
0.45 mm
Dot size
0.42
0.42 mm
Size of a standard character
Height 7.2 mm
Displa panel
Effective display area
117 mm horizontally
63 mm vertically
Display panel
View angle
Up/Down:
"
30
_
Left/Right:
"
30
_
Display color
White, black 2 color (blue mode)
Life expectancy
(until brightness reduced by half)
50,000 hours minimum
The contrast can be adjusted with the contrast adjustment on the
Contrast adjustment
The contrast can be adjusted with the contrast adjustment on the
b
k f th NT21
Contrast adjustment
j
j
back of the NT21.
Life expectancy*
1
50,000 hours minimum
Backlight
(white cold
Replacement
Not user serviceable
(white cold
cathode tube)
Brightness adjustment
Not user serviceable
cathode tube)
Automatic turn-OFF function
Can be set to turn OFF in 1 to 255 minutes, or to remain ON
Indicators
RUN
Lit green: Running normally, Memory Unit automatic transmission
done
Flashing green: Memory Unit automatic transmission being
executed, Memory Unit automatic transmission error
Indicators
RUN
executed, Memory Unit automatic transmission error
Lit orange during operation: Low battery voltage (when a battery is
installed)
Lit red when NT21 is stopped: Low battery voltage (when a battery is
installed)
*1: Time taken for brightness to reduce to half at normal temperature and humidity
Panel Specifications
Item
Specification
Type :
Resistive type
Number of switches:
91 (13 horizontally
7 vertically)
Maximum number that can be registered on one screen: 256
Touch panel
Cell size:
Approx. 9
9 mm
Touch panel
Input:
Pressure-sensitive type
Operating force: 1 N minimum
Life expectancy: One million operations minimum
External Interface Specifications
Item
Specification
Serial communication
Serial ports A and B
Conforms to EIA RS-232C
D-SUB 9-pin connector (female)
+5 V output at pin No. 6 (Total output 150 mA max. from ports A and B)
Expansion interface
Dedicated connector
Note When using the +5 V output of pin No. 6, check that the total current required by the devices connected to
ports A and B is less than 150 mA. The NT21 su5 V
"
5% (150 mA max.) to pin 6 of these ports.