cursor
6-54
top and bottom margins (scrolling region) are selected.-!£.!. the
Tests and Adjustments
Function buffers. Select terminal self-test using the following sequences.
NOTE: Test results are shown on the ke board and screen. The test modem interface connector.
EIA loop back test. Uses test connector on the modem interface connector.
Printer loop back test.
Uses test connector on the
printer interface
connector.
Repeat power up test
continuously until failure or power off.
Repeat data loopback test continuously until failure or power off. Uses test connector on the modem
interface connector.
Invoke DECTST ESC [ 2 ; 1 2 Y Repeat EIA loopback test Confidence fiB 3 133 062 073 061 062 171 continuously until failure
Test or power off. Uses test
connector on the modem interface connector.
Invoke DECTST ESC [ 2 ; 2 4 Y Repeat printer loop back Confidence 033 133 062 073 062 064 171 test continuously until
Test failure. Uses test
connector on the printer interface.
Screen DECALN ESC i 8 This command fills the Al ignment "33 043 070 complete screen area with
Display uppercase E's for screen
focus and al ignment. This command is used by DEC manufacturing and Field Service personnel.
6-56
VT52 COMPATIBLE SEQUENCES
The VT52 compatible sequences meet private DIGITAL standards.
Therefore, the VT131 terminal can use existing software designed for previous terminals (such as the VT52). VT52 compatibility is selected from the keyboard in SET-UP (refer to Chapter 2) or by the computer using a sequence (refer to the ANSI Compatible Sequences section of this chapter).
Mode Selection
While in VT52 mode, most of the features of the terminal can not be selected using sequences. However, the following three modes can be selected using sequences:
ANSI mode
Alternate Keypad mode on
Alternate Keypad mode off (Numeric mode selected) ANSI/VT52 Compatibility
The VTl31 terminal is an upward and downward software compatible terminal. The terminal is compatible wi th both ANSI standard and private DIGITAL standards. Therefore, new software which meets the ANSI standards and existing software designed for previous terminals (such as the VT52) can be used. The ANSI compatible sequences meet standards X3. 64-1979 and X3. 41-1974. The features of the terminal selected in ANSI mode are also used while in VT52 mode. However, these features usually can not be changed in VT52 mode. Therefore, ANSI mode must be used to select most of the VT131 features. Select ANSI compatibility using the following sequence.
Name
ANSI mode
Mnemonic Sequence DECANM ESC
<
033 074
Keypad Character Selection
Function
All sequences are
interpreted according to ANSI Standards X3. 64-1979 and X3. 41-1974. The VT52 escape sequence descr ibed in this section are not recognized.
The auxiliary keypad can be used to generate either numeric characters or control functions. When the keypad is used to generate control functions; alternate (application) keypad mode is selected. When the keypad is used to generate numeric characters, exit alternate keypad mode (select numeric keypad mode). Refer to Table 6-14 for the characters generated by the keypad keys. Enter and exit alternate (application) keypad mode using the following sequences.
NOTE: Power up or reset causes the terminal to exit alternate
~~YE~~_~~~~_l~~l~£!_~~~~Ei£_E~YE~~_~~~~l~_~l~~L_i~_~ll
Table 6-14 VT52 Keypad Codes
Alternate Keypad Alternate Keypad Key Mode Off (Numeric Mode On
Keypad Mode)
~ ESC ? P
~6~ ~33 ~77 16~
1 1 ESC ? q
~61 ~33 ~77 161
2 2 ESC ? r
~62 ~33 ~77 162
3 3 ESC ? s
~63 ~33 ~77 163
4 4 ESC ? t
~64 ~33 ~77 164
5 5 ESC ? u
~65 ~33 ~77 165
6 6 ESC ? v
~66 ~33 ~77 166
7 7 ESC ? w
~67 ~33 ~77 167
8 8 ESC ? x
97~ ~33 ~77 17~
9 9 ESC ? Y
971 933 ~77 171
-(minus) -(minus) ESC ? m
~55 ~33 ~77 ISS **
, (comma) , (comma) ESC ? 1
~54 ~33 ~77 154 **
• (per iod) • (period) ESC ? n
~56 12133 ~77 156
ENTER* CR CR LF ESC ? M
~15 or ~15 12112 12133 12177 115
PF1 ESC P ESC P
~33 12~ 933 12~
PF2 ESC Q ESC Q
~33 121 933 121
6-58
Table 6-14 VT52 Keypad Codes (Cont)
Alternate Keypad Alternate. Keypad Key Mode Off (Numeric Mode On
Keypad Mode)
PF3 ESC R ESC R
r;,33 122 r;,33 122
PF4 ESC S ESC S
r;,33 123 r;,33 123 **
*
When numeric keypad mode is select (alternate keypa"d mode is off), the ENTER key generates the same characters as the RETURN key. The RETURN key character code can be changed by the line feed/new line feature. When off, this feature causes the key to generate a single control character (CR, octal ~15)~ When on, this feature causes the key to generate two characters (CR, octal r;,15 and LF, octal r;,12).** These sequences are not generated by the VT52.
communication except full duplex no modem control (FDX A), numeric kelpad mode is selected during a communication line connection.
Re er to Chapter 7 for more information about communication. generate characters that corresponding to the numeric, comma, period and minus sign keys of the main keyboard.
NOTE: In VT52 mode, the alternate and numeric keypad modes generate-alffirentcharacEers-Fl1"an-T n ANS I mode.
Character Sets and Selection
While in VT52 mode, the terminal can use either the character set
~ommunication line conn!..£t.!..£.!!..!...;Refe£~.£~~.E!!.£_~.-!.££~£!.
lnformation about communTcatlon.
Name Sequence
Table 6-15 Special Character and Line Drawing Set and Graphics
L-Special Character and Line Drawing Set
Blank Diamond
Checkerboard (error indicator) Hori zontal tab
one column to the right when a character is displayed. ASCII characters whose codes are the octal number plus octal "37. For exampl e , I ine I col umn 8 parameters are octal 04"
(first line) and octal 950
Reverse Line Feed
Erasing removes characters from the screen. When characters are erased from the screen, the characters are lost. Erase characters including the cursor posi tion. The cursor does the following sequences.
Name Sequence Function
NOTE: Auto print operation can be turned on or off at any time, however auto printing is not performed while in edit mode.
Auto operation. Therefore, printer controller can be selected and characters printed while auto print Is on.
controller operation. All characters received by the
controller operation. The printhaed should be moved
Print Screen
Reports
ESC V 033 126
Causes the serial printer to print the screen.
Depending on the print extent (DECPEX) sequence, either the full screen or just the scrolling region is pr inted. The scroll ing region is selected using the DECSTBM sequence. The print screen operation ends when the screen is printed.
Reports are generated by the terminal in response to a request from the computer. The terminal generates only one report in VT52 mode. The following sequences are the request for a report and the
response to the report request.
Identify
Identify
ESC Z 033 132
ESC / Z 033 057 132
This sequence causes the terminal to send an identify sequence to the computer.
VT131 response to Identify.
CHAPTER 7 COMMUNICATION
GENERAL
This chapter describes how the VT131 terminal communicates wi th the computer and optional serial printer. The chapter is divided by the type of interface, modem or printer. A detailed description of each connector and its signals 'is provided. Also, this chapter describes 'the c~mmunication features used by the terminal.
NOTE: The 20 mA current loop interface option (V~lXX-CA) is
aii"Cr-r6eaTn-cnapter~'§"
.:.
CONNECTING
10
THE COMPUTERThe VT13l termi'nal can be physically connected to a computer directly or' through a common carrier facility (telephone line) as snown in Figure 7-1. In both appl icatioris, either the modem interface provided with the terminal or the VTIXX~CA 29 mA current
loop interface option are used. '
-When connecting the terminal to the computer using a modem, three steps are ~eededr
1)
2)
3)
Select a modem. ~hemodem used by the terminal must be compatible wi~h the modem used by the computer. Several types of modems can be used with the VT131terminal. Table 7-1 lists the · possible modem configurations used on public swi tched
teleph6n~ lines. Table
7-2
lists the possible modem configurations used on dedicated telephone lines.Select the communication SET-UP features. The SET-UP features must be selected to match the' type of communication used wi th the computer. The communication features are described in the Modem Serial Characters ,Break and Modem Control sections of this chapter. Refer to . Chapter 4 for more information about thecoQU\\unication SET-UP features.
Select the internal communication swi tches of the terminal.
Compare the interface information provided with the modem, to the interface' information provided' in the' Modem Control
s~ction of· this chapter • Determine which lines of the terminal are not used by' the modem and disconnect these signals using tl1e internal communication swi tche.s. . .
•
COMPUTER
TERMINAL
MA-7776A
Figure 7-1 Connecting,to the Computer
7-2