Intermec CV30 Intermec Terminal Emulator (ITE) Programmer's Reference Manual - Page 27

Data Stream Commands and Orders, Screen Design Aid, Applications, Data Stream Command Structure

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Chapter 1 - About 3270 and 5250 Programming 5250 Data Stream Commands and Orders This section describes the following: • Host 5250 display data stream commands the host sends to computers. • Host 5250 data stream orders the host sends to computers. Orders govern format and data expectations within the Write to Display command. • Asynchronous 5250 prefixes. • System messages and parameter errors that show in the computer display. This chapter is not intended as a programming guide, but as a comparison with your existing system. It helps identify differences between your screen-generating utilities and the features the computers support. Screen Design Aid This section, along with your Screen Design Aid (SDA) documentation, can help you resolve occasional questions regarding attribute selection and the capabilities of the computers. You can use your SDA to do much, if not all, of the programming to handle commands and orders for the network. This chapter is provided to ensure you have the most accurate and detailed information available and to describe variations from the 5250 data stream where they occur. If you are comfortable using the SDA on your host computer, this chapter will tell you which commands and orders the computers support. For more information on extended commands, see "About Extended Commands" on page 86. Applications If you need to write applications specifically for the computer, Intermec recommends that you use the corner mode window onto the IBM Display Station and write programs using the portion of the display available without moving the window. This is the most efficient method for developing custom applications for the computer. Data Stream Command Structure The 5250 command structure enables the computer to display prompts and accept keyboard or scanner input. A second kind of command, called an order, works with the Write-To-Display command to define display characteristics, buffer sizes, and acceptable data types. Display data stream commands form two categories: the input commands and the output commands. For more information, see the IBM 5250 Information Display System Functions Reference Manual (IBM P/N SA21-9247-6). Intermec Terminal Emulator (ITE) Programmer's Reference Manual 15

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Chapter 1 — About 3270 and 5250 Programming
Intermec Terminal Emulator (ITE) Programmer’s Reference Manual
15
5250 Data Stream Commands and Orders
This section describes the following:
•
Host 5250 display data stream commands the host sends to computers.
•
Host 5250 data stream orders the host sends to computers. Orders govern
format and data expectations within the Write to Display command.
•
Asynchronous 5250 prefixes.
•
System messages and parameter errors that show in the computer display.
This chapter is not intended as a programming guide, but as a comparison with
your existing system. It helps identify differences between your screen-generating
utilities and the features the computers support.
Screen Design Aid
This section, along with your Screen Design Aid (SDA) documentation, can help
you resolve occasional questions regarding attribute selection and the capabilities of
the computers. You can use your SDA to do much, if not all, of the programming to
handle commands and orders for the network. This chapter is provided to ensure
you have the most accurate and detailed information available and to describe
variations from the 5250 data stream where they occur.
If you are comfortable using the SDA on your host computer, this chapter will tell
you which commands and orders the computers support. For more information on
extended commands, see
“About Extended Commands” on page 86.
Applications
If you need to write applications specifically for the computer, Intermec
recommends that you use the corner mode window onto the IBM Display Station
and write programs using the portion of the display available without moving the
window. This is the most efficient method for developing custom applications for
the computer.
Data Stream Command Structure
The 5250 command structure enables the computer to display prompts and accept
keyboard or scanner input. A second kind of command, called an order, works with
the Write-To-Display command to define display characteristics, buffer sizes, and
acceptable data types.
Display data stream commands form two categories: the input commands and the
output commands. For more information, see the
IBM 5250 Information Display
System Functions Reference Manual
(IBM P/N SA21-9247-6).