Omron NT21 User Manual

5-2SectionExamples of Actual Applications of Memory Link
413
• Explanation
• Numeral memory table entry number: 142
• Input numeral: 00000000F0
H
(240 in decimal)
• Checksum: 19H
It is ascertained that 240 is input to numeral memory table entry 142. With nu-
meral input notify command, input numeral data is expressed as binary. Here,
input data (240) is expressed as binary (000000F0
H
).
2. When numeral is written to PT (numeral memory table write command (sent
from host to PT) )
• Command
8
1B 57
[ESC] W
31
30
0
34
4
4E
N0
3038
1
0
30
0
04
34 42
B0
303030 0D
[CR]
(3)
(1)
0
30
32
2
(2)
• Explanation
• Checksum present/absent: None (writing 1 word)
• First numeral memory table entry written: 142
• Data of written numeral memory table entry: 000004B0
H
(1200 in decimal)
In this way, numeral data that is input from the PT is processed at the host and
the result is notified to the PT.
Suggestions
• Same as numeral, character string input notify command (sent from PT to
host) is issued from the PT for the character string that is input at PT. (Refer to
page 391.)
• Character string that is input from bar code reader is also notified to the host.
(Refer to page 210.)
• Data of numeral/character string memory table entry can be cleared by
memory table clear command. (Numerals are cleared to 0, and character
strings are cleared to the space code 20 H.) (Refer to pages 386 and 387.)

Omron NT21 Specifications

General

Display Type	STN monochrome LCD
Display Size	5.7 inches
Resolution	320 x 240 pixels
Touch Panel	Analog resistive
Communication Ports	RS-232C, RS-422/485
Power Supply	24 VDC
Operating Temperature	0 to 50°C
Storage Temperature	-20 to 60°C
Weight	0.8 kg
Memory	512 KB

Summary

SECTION 1 General

1-1 Role and Operation of the PT

Introduces the fundamental role and operation of Programmable Terminals (PTs).

1-2 Functions of the NT21, NT31/NT31C and NT631/NT631C

Details the features, comparisons, and principal functions of the NT series terminals.

1-3 System Configuration

Explains the system configuration and peripheral devices connectable to the PTs.

1-4 Communications with the Host

Covers various communication methods for connecting the PT to a host system.

1-5 Communication by Using Memory Links

Describes communication using memory links, a method other than direct connection.

1-6 Before Operating

Provides essential steps and considerations before operating the PT.

SECTION 2 PT Functions

2-1 PT Screens

Describes the PT screens which form the basis of PT functions.

2-2 Areas for Control/Notification

Explains the areas provided for PT control and status notification between PT and host.

2-3 Memory Tables

2-7 Touch Switches

Details input from the touch panel, allowing screen switching and bit information transmission.

2-8 Numeral Display

2-9 Character String Display

2-11 Alarm List, Alarm History

Explains monitoring host bits and displaying messages or image/library data when a bit changes to ON.

2-12 Inputting Numeric Values

Details the procedure for inputting numeric values using numeral input fields or thumbwheel switches.

2-13 Inputting Character Strings

Explains inputting character strings using touch switches or a bar code reader.

2-14 Recipes

Describes writing and reading data in table format to/from the host, allowing multiple settings to be managed.

2-15 Window Function

2-16 Special Functions

Covers display history, alarm history, resume, screen saver, buzzer, clock, print, contrast/brightness, programming console, and device monitor.

2-17 Device Monitor Function

Details the Device Monitor function for reading/changing PC data and displaying PC error logs.

2-18 Mathematical Function

2-19 PT Configuration Settings

SECTION 3 How to Use the PT

3-1 Screen Creation Procedure

3-2 Buzzer, Backlight, and Display Control

3-3 Screen Display and Notification

3-4 Display and Control of Windows

3-7 Input of Numeric Values and Character Strings

3-8 Using the Alarm List/History Function

3-9 Using the Display History Function

3-10 Display and Setting of Calendar Clock

3-11 Printing Data and Checking the Printer Status

3-12 Enabling/Disabling PT Operations

SECTION 4 Using Memory Link

4-1 Operation of the Memory Link

4-2 Outline of Communications

4-3 Commands/Responses

4-4 Memory Link Online Transfer Function

SECTION 6 Troubleshooting and Maintenance

6-1 Troubleshooting

Guides on actions to take when PT errors occur, by matching symptoms to remedies.

6-2 Responding to Displayed Error Messages

Details how to respond to various error messages displayed on the PT.

Appendix B Compatibility with Screen Data of Other PT Models

Appendix C NT20S and NT30/620 Compatible Modes