Omron NT20, User Manual

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138
Outline of Functions Section 4-2
• Reverse and Flashing Display
Reverse display: The display brightness of the character and
the background is reversed comparing with
the normal display.
Flashing display: Characters are displayed as they flash. The
normal display alternates with no-display.
Reverse and flashing display: The reverse display alternates with the nor-
mal display.
Types and Attributes of the Figures
The following types of figures can be input by using the Support Tool and be
displayed during operation. Continuous straight lines including up to 256 verti-
ces can be drawn (up to 255 straight lines can be connected).
4-2-3 Communications with the Host
Communications Using Host Link/NT Link/C200H Direct Communications
The NT20 can communicate with the PLC through the host link/NT link. Bits
and words are allocated to areas of the PLC memory (selectable without
restriction) and the NT20 can write data to them or read from them directly.
This makes the following functions possible:
• Control/Notification of display elements
• Control/Notification of the NT20 status
• Screen switching
• Ascertaining the number of the screen currently displayed
• Memory table operations
For details on actual operations, refer to SECTION 5 How to Use the Host
Link/NT Link .
Communications through
RS-232C The NT20-ST128 can communicate with the host through the RS-232C inter-
face. In other words, it can receive and send commands through the RS-232C
interface, which allows various types of host to utilize the functions of the
NT20:
• Control/notification of display elements
• Control/notification of the NT20 status
• Memory table operations
• Screen operation
• Display/deletion of characters/graphics
For details on actual operations, refer to SECTION 6 Using RS-232C Commu-
nications .
Controllable NT20 Functions
The following NT20 status can be controlled:
• Screen switching: Screen is displayed or cleared.
• Continuous/intermittent buzzer: Buzzer operation is started or stopped.
• Back light mode: Back light is lit or made to flash.
For details on how these NT20 functions are actually controlled, refer to 5-4
NT20 Status Control on page 203, and Buzzer Control on page 228.
Continuous straight lines
Circle