Control Techniques UD70, User Manual

Page: 94 / 154

UD70
Issue code: 70nu2
7-18 Reference
PRINT
Syntax PRINT Expression list separated with a “,”.
The
PRINT
instruction outputs strings or values to the
PC RS232
serial port of
the
UD70
. All items in the expression listing must be separated by commas.
Strings are enclosed in double quotes (“ ”).
A tab character (
ASCII
09) is automatically printed between each character
separated by a comma. Negative values are prefixed by a – – sign; positive
values have no prefix.
Operation in
various
tasks The way this instruction operates depends on the task, as follows:
In
BACKGROUND
Task, the
PRINT
instruction halts program execution until all
characters are transmitted. It is recommended to use the
PRINT
instruction
in the
BACKGROUND
task only.
In the
CLOCK
and
ENCODER
Tasks, program execution continues without
waiting. At 19200 baud rate, it takes 0.5ms to transmit one character. The
PRINT
instruction would then quickly over-run the
CLOCK
or
ENCODER
Task.
If another
PRINT
instruction is executed before the previous
PRINT
instruction is finished the remaining characters are not printed.
The string can contain non–printable characters by using an escape
sequence. This begins with a back-slash [\] character followed by the non–
desired character.
The available characters are as follows:
Character Function ASCII Character
\b Backspace 8
\p Line feed 9
\t Tab 10
Table continued...
Character Function ASCII Character
\f Form feed 12
\r Carriage return 13
\v Vertical tab. 11
\\ Single back-slash 92
\NNN (N is an octal number)
Example
PRINT
“Hello\r\n Goodbye\r\n”
This prints the following words:
Hello
Goodbye