Rockwell Automation 1746-BAS BASIC LANGUAGE - Manual (Page 47)

Publication 1746-RM001A-US-P
BASIC Commands 4-7
Control-S Purpose
Use the
[CTRL-S]
command to interrupt the scrolling of a BASIC program during
the execution of a LIST command. [CTRL-S] stops output from the transmitting
port if you are running a program. In this case XOFF ( [CTRL-S] ) operates as
follows:
•
XOFF only operates on PRINT statements.
•
When received during a PRINT, data output is suspended immediately but
program execution continues.
•
When received at any other time, the program continues until encountering a
PRINT statement. At this time data output is suspended. The program
continues to fill the output buffer until the buffer is full.
•
XON (
[CTRL-Q]
) is required to resume data output operation.
Syntax
[CTRL–S]
Example
> LIST
1 REM EXAMPLE PROGRAM
10 A = 1
20 DO
[CTRL–S]
.
.
.
[CTRL–Q]
30 A = A+1
40 PRINT A
50 WHILE A < 20
READY
>
In this example, the output is suspended when [CTRL–S] is pressed. The output is
continued after
[CTRL–Q]
is pressed.
IMPORTANT
[CTRL-S] only works if you have enabled software
handshaking on the program port.