191
System Maintenance Section 6-11
On completion of communications condition/confirmation method setting, the
NT31/NT31C returns to the memory switch setting screen (4/4).
To set other memory switches, select the relevant screen using the [ ] (next
screen) or [ ] (previous screen) touch switch, then make the setting.
• To confirm the settings and quit the memory switch setting screen, press
the Quit touch switch. The settings made last will be set and the NT31/
NT31C will return to the MAINTENANCE MODE MENU screen.
• To quit the memory switch setting screen without confirming the settings,
press the Abort touch switch. The NT31/NT31C will return to the MAIN-
TENANCE MODE MENU screen with the previous settings still in effect.
6-11 System Maintenance
The NT31/NT31C has the following maintenance and check functions.
This section describes how to use these functions.
6-11-1 I/O Settings
This function is used to adjust the contrast of the display panel and the bright-
ness of the backlight.
With the NT31/31C, you can adjust the contrast and brightness settings using
either of the following two methods.
Setting from the System Menu
Adjusting the contrast: Select System Menu/Maintenance Mode/I/O Settings/
Contrast Adjust.
Adjusting the brightness: Select System Menu/Maintenance Mode/I/O Set-
tings/Brightness Adjust.
Setting Using Special Screen During PT Operation
You can set the brightness and contrast by displaying the screen with the fol-
lowing number, using a touch switch with a switch screen function, or by spec-
ifying the display screen in the PT status control area.
Screen number 9030: Brightness and contrast adjustment screen.
Contrast Adjustment The NT31/NT31C allows the contrast to be adjusted in 100 steps. The CON-
TRAST ADJUST screen enables you to make the adjustment while actually
checking the contrast on the screen. Once the contrast has been set, it
remains in effect even if the power is turned OFF or the NT31/NT31C is reset
(and even if the voltage of the built-in battery becomes low).
Setting from the System Menu
Adjust the contrast of the display panel by following the menu operation from
the System Menu shown below.
Item Function Page
I/O Settings Adjustment of display panel contrast and brightness of the backlight. 191
Calendar Check Display and setting of the time data of the NT31/NT31C clock function. 195
PT Settings Direct connection setting of the screen data in the NT31/NT31C and display of the
setting statuses of the serial ports.
197
Display history record Display and printing of display history record data. 198
Alarm history record Display and printing of alarm history record data. 200
Screen data check Display of each screen stored in the NT31/NT31C. 202
I/O
check
Device check Checking of the I/O functions of the NT31/NT31C. 205
I/F check Checking of the communications functions of the NT31/NT31C. 214
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