12 ASCII Escape Sequences

This chapter summarizes the ASCII escape and control Sequences that the VT510 recognizes when it is operating in its ASCII emulation modes.

12.1 ASCII Communications

Table 12–1 lists the serial port control functions for each mode. The word "same" in Table 12–1 signifies the same control sequence as the WYSE 160/60 column.

12.2 Terminal Management

Table 12–2 lists the terminal management control functions. The word "same" in Table 12–2 signifies the same control sequence as in the WYSE 160/60 column.

12.3 Keyboard Processing

Table 12–3 lists the keyboard processing control functions. The word "same" in Table 12–3 signifies the same control sequences as in the WYSE 160/60 column.

Table 12–4 lists the redefinable keys.

Table 12–4 Redefinable Keys

Emulation	Redefinable Keys
WYSE 160/60, WYSE 150/120, WYSE 50+, TVI925, and TVI 910	Unshifted	Shifted	VT Keyboard	EPC Keyboard
	SP	%		ESC
	!	&	Tab	Tab
	"	´	Backspace	Backspace
	#	(	Remove
	$	)	Return	Enter
	*	/	Select	Home
	+	0
	,	1
	-	2
	.	3
	s	4	Enter	Enter (keypad)
	q	p	PF4	Insert
	r	w		Page Down
	}	z	PF3
	5	6	PF2	Delete
	7	8	PF1
	R	X		Print Screen
	:	;		Page Up
	\	]		End
	Q	W	F17
	S	Y	F18
	T	Z	F19
	P	V	F20
TVI 950	Fkey	Fkey	VT Keyboard	Enhanced PC Keyboard
	1	<	F1	F1
	2	=	F2	F2
	3	>	F3	F3
	4	?	F4	F4
	5	@	F5	F5
	6	A	F6	F6
	7	B	F7	F7
	8	C	F8	F8
	9	D	F9	F9
	:	E	F10	F10
	;	F	F11	F11
	G	L	F12	F12
	H	M	F13
	I	N	F14
	J	O	F15
	K	P	F16
WYSE 160/60 PCTerm	Fkey Unshifted		VT Keyboard	EPC Keyboard
	1	!	F1	F1
	2	@	F2	F2
	3	#	F3	F3
	4	$	F4	F4
	5	%	F5	F5
	6	^	F6	F6
	7	&	F7	F7
	8	*	F8	F8
	9	(	F9	F9
	0	)	F10	F10

12.4 Screen Processing

Table 12–5 lists the screen processing control functions. The word "same" in Table 12–5 signifies the same control sequences as in the WYSE 160/60 column.

Table 12–6 lists the data protection control functions. The word "same" in Table 12–6 signifies the same control sequences as in the WYSE 160/60 column.

Table 12–7 lists the cursor control functions. The word "same" in Table 12–7 signifies the same control sequences as in the WYSE 160/60 column.

Table 12–8 lists the ASCII editing control functions. The word "same" in Table 12–8, Table 12–10, and Table 12–11 signify the same control sequences as in the WYSE 160/60 column.

In local edit mode, instead of sending keycodes to the host, some function keys send codes directly to the terminal to speed up the editing process. Table 12–9 lists these local edit functions and their operating keys for both the VT keyboard and the Enhanced PC keyboard.

Table 12–10 lists the tab stop control functions.

Table 12–11 lists the page edit control functions.

Table 12–12 lists the rectangle area control functions.

12.5 Printing/Sending Data

This section describes commands to print and send data.

12.5.1 Sending Data

This section describes commands to send a defined area of data on the screen through the main communication port using ASCII control functions. Individual commands address the specific data to be sent.

In send operations, delimiter characters are sent along with data to mark a line end, transfer complete, or the protect data and its area. Table 12–13 lists the possible delimiter types. Depending on the scope of data (line, page) and the type of data (protected, unprotected) that has been sent, different delimiter characters are enclosed. The individual commands explain which delimiter should be sent with each command.

Table 12–13 lists the types of delimiters to send data.

All the send data actions in this section, except "Send the Cursor Character" command, use the following rules:

• The attributes are not sent along with their data. But a Space character (Hex 20) is inserted between two distinct attribute data to indicate the attribute difference.
• During the process of sending characters, the cursor moves to the location of the character being sent.
  • Protect mode on: The cursor does not move.
  • Protect mode off: The cursor moves to the left margin of the next line.
• Null characters on the screen are not sent.
• Delimiter characters:
  • TVI modes and WYSE 160/60 PCTerm modes: Defined by command "Define Delimiters" (Refer to the command for details.)
  • Other personalities: See Table 12–14.

• If any line on the screen is locked, then the line is not sent; however, the end of line delimiter is still sent to indicate a line has been skipped.
• If the first character sent is a protected character, then the ESC ) sequence is not sent before the first character; if the last character sent is a protected character, then the ESC ( sequence is not sent before the terminator.
• If the cursor position is located at the right margin of the bottom margin line and the Protect mode is off:

  Autopage	Autoscroll	Page Mode	Cursor moves to . . .
  On	–	Single	Home position of the active page.
  On	–	Multiple	Home position of the other page.
  Off	On	Multiple	Left margin of the bottom line after a scroll is performed.
  Off	Off	Multiple	Home position of the active page.

Table 12–15 lists the print/send control functions.

ASCII emulations do not send:

• Initialization codes
• Ending sequences to designated character sets and display attributes
• "Fallbacks" to represent data that cannot be printed by the attached printer

The only factors that affect printing data are data and parity settings.

Table 12–16 lists the printing data control functions.

12.5.2 Graphics Characters

Table 12–17 lists the graphic characters.

With Graphics mode on, all received codes in the range of 00 to 7E are displayed as characters in the range of Hex 00 to Hex 1F in the same character set.

This is done by stripping off the highest 3 bits of the code. For example:

Most character sets in ASCII emulation contain characters in the range of Hex 00 and Hex 1F. For example, the Native character set contains 16 line-drawing graphics characters from Hex 10 to Hex 1F and 16 CRM characters from Hex 00 to 0F. But in most of the cases, Hex codes 00 to 1F are treated as control codes. To display these graphic characters, Graphic mode has to be turned on.

When the Graphic mode is on, new characters entered have normal attributes regardless of the state of the Write-Protect mode attribute. With Protect mode on, all the entered characters, except CRM characters, are protected.

To design a character font, see Chapter 13.