VT52 MODE CONTROL SEQUENCES

The CIT101XL control sequences defined here are valid in the VT52 mode of operation. Unless otherwise noted, actions described are taken in response to receipt of the indicated control sequence.

Cursor Control Sequences Move cursor up

Erase Control Sequences Erase to end of line

Enter Special Graphics mode Exit Special Graphics mode

ESC F ESC G

Use the Special Graphic Character Set when in graphics mode.

Keypad Application Mode

Enter Keypad Application mode Exit Keypad Application mode

ESC ESC >

Use the special applications control sequences from the numeric keypad.

Bidirectional Auxiliary Port Control Enter Concurrent Auxiliary mode output cursor line to Auxiliary Enter Auxiliary Controller mode Exit Auxiliary Controller mode output full screen to Auxiliary

INTRODUCTION

The CITIOIXL terminal is general purpose display terminal which operates in one of the two most commonly used programming standards ASCII or ANSI. The mode of operation is selected in Set-up mode and is described in Chapter 4.

In the ASCII mode of operation the terminal recognizes codes as defined by the ANSI document X3.4-1977 which defines the American Standard Code for Information Interchange (ASCII).

In the ANSI mode the terminal recognizes ASCII codes and also recognizes control sequences as defined by ANSI document X3.64-1979 "Additional Controls for Use with American National standard for Information Interchange".

In this chapter application information for the ASCII mode of operation is presented. For application information in the ANSI mode of operation refer to Chapter 6.

In either mode of operation the terminal exchanges information with the host by the use of codes which are defined by the ASCII standard. These codes are categorized as either Graphic character codes or Control character codes.

Graphic character codes represent the letters of the alphabet, numbers, punctuation marks and various other symbols (such as dollar signs, plus signs, and so on). The CITIOIXL also has the capability to sUbstitute international character sets for the standard US ASCII character set.

Control character codes represent control functions and are used as instructions to the terminal or host for control functions such as a carriage return, end-of-transmission, introduce a· control code sequence

(that can include graphic character codes), or other functions common in terminal operations.

HOW INFORMATION IS PRESENTED IN THIS CHAPTER

The ASCII codes in this chapter are presented in the form of ASCII mnemonics. Refer to Appendix C which contains the ASCII code chart and also provides the binary and hexadecimal equivalents for the ASCII mnemonics. For example, the ASCII code for controlling the terminal tone is shown in this chapter and in the ASCII code chart as the ASCII mnemonic BEL. The hexadecimal equivalent is 07H and the decimal equivalent is 7.

In this chapter the key or keys required to generate a control code are indicated by <> brackets. For example the BEL code can be generated from keyboard by pressing <CTRL-G>. A complete listing of the key actions required to produce control codes from the keyboard is contained in the section titled ASCII CODES GENERATED AT THE TERMINAL. Refer to Chapter 3 for a detailed description of the CITIOIXL keyboard.

Two types of sequences are presented in this chapter: control code and escape. A control sequence can consist of ASCII control codes, graphic character codes and parameters. Escape sequences contain the ASCII control code ESC (escape) as the introducer to the sequence.

When control or escape sequences are presented in this chapter, the sequence may contain ASCII graphic characters in addition to ASCII mnemonics. The codes for this characters can also be found in the ASCII code chart.

Two types of parameters are contained in this section and are noted as Ps or Pn. Ps refers to selective parameter that selects a specified function from one of several available to a control or escape sequence.

Pn refers to numeric parameter which indicates a numeric value. For example, a specific row or column on the display screen.

ASCII KEYBOARD FEATURES AND CODES

In this section the features and functions available at the keyboard when in the ASCII terminal emulation mode are described. Also contained are the codes generated by the keyboard entries. A general description of the keyboard and the different types of keys present on the keyboard is contained in Chapter 3.

The programmable function keys are described in Chapter 4.

KEYBOARD FEATURES

In addition to the common functions available from the keyboard such as TAB, BACKSPACE, etc., which are described in Chapter 3, there are are other features available. These features allow the operator to control the terminal operating parameters without entering Set-up mode. Some of these features are intended for use by programmers or maintenance personnel.

MONITOR MODE -- <CTRL-SHIFT-l> will toggle the terminal monitor mode.

The <1> key on the numeric keypad must be used in this key sequence.

SMOOTH SCROLL RATE -- <CTRL-SHIFT-t> will increment the smooth scroll rate until the terminal reaches the jump scroll mode. <CTRL-SHIFT-~>

will decrease the scroll rate until the slowest rate is reached.

KEYCLICK MODE keyclick mode.

<SHIFT-ENTER> or <CTRL-SHIFT-ENTER> will toggle the

KEYBOARD UNLOCK -- Either the <SET-UP> key alone or <CTRL-SET-UP> will unlock the keyboard and disable all printer pass through modes.

DUPLEX TO BLOCK MODE TOGGLE -- <SHIFT-BREAK> OR <CTRL-SHIFT-BREAK> will place the terminal in the block (BLK) communication mode from the full duplex (FOX) or half duplex (HDX) communication mode.