Correcting Command Entry Errors; Understanding Error Messages - Tektronix 4106 Operator's Manual

Computer display terminals
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HOW TO USE
SETUP COMMANDS
CORRECTING COMMAND ENTRY ERRORS
If you notice a mistake
in
a Setup command before you press the Return
key,
press
the Rub Out
key
to back up and erase the
error.
You can also enter Ctrl-X to erase
the entire
command
line
,
and then reenter the
command
.
To enter
Ctrl-X,
hold down
the Ctrl key
and
press the X key - don
't
type the hyphen
.
If you make a mistake and you 've already pressed the Return key, just reenter the
command
correctly.
For instance,
if
you discover that you entered the wrong
parameters for a
command
,
simply
enter the command again with the correct
parameters. The last entry overrides any previous entry
for
the
same command
(unless it is
a DRAW or BEGIN PANEL command - see Correcting Segment and
Panel Definition Errors
in
Section 2)
.
UNDERSTANDING ERROR MESSAGES
When you enter a Setup command
incorrectly,
the terminal displays an error
message that helps you
identify the
type of
error.
In many cases
,
the terminal
displays a
string
of
asterisks
below the
incorrect
portion of the command to help
you locate the
error.
For example
,
suppose you want to change the size of the dialog area and
you
accidentally enter DALANES instead of DALIN ES
.
The terminal would display
the
following error message
:
DALANES
6
*******
>>Terminal
Detects
Error:
Nonexistent Command
*
Should you make an error entering the parameters of a command
,
the
terminal
may display asterisks below
the
parameter that caused
the
error.
For example, say
you enter a DALIN ES command with two parameters instead of one
.
DALIN ES
requires only one
parameter,
so the error message appears as follows:
DALINES
20,8
**
>>Terminal
Detects
Error
:
Extraneous Input
*
The message tells you that you entered
too
many parameters for the command
;
the
asterisks locate the extraneous
input -
the comma and the
8.
Now, suppose you accidentally enter a parameter value that
is
out of
the
range for
the command
.
To illustrate
,
assume you want to set the size of the dialog area to 20
lines, and you enter 200 for the parameter value
instead
of 20. The following error
message would
appear:
•DALINES
200
>>
Terminal Detects Error LL
11:
»
Invalid
Value
in
Parameter
1
of
(ESC)(L)(L) Command .
..
In this case, the terminal displays an error code (LL
11)
instead of asterisks to
identify the parameter
error.
If you need more information about valid values for a
parameter,
refer
to your 41061410714109/CX Programmers Reference Guide.
3-4
4106/4107/4109
OPERATORS

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