Instruction Manual

252 Language Reference • Reference
Publication 1398-PM601A-EN-P — October 2000
WORDS
Remarks Numbers are always displayed justified to the right side of the field. However, the field
will be overrun if the number of characters in the variable exceeds the specified field
width.
Control codes can be sent to a serial port using the standard PRINT statement. The
control codes may be used to position the cursor, print other text, or perform special
functions. These control codes are normally used with a generic terminal rather than
an Allen-Bradley Operator Terminal. The syntax of the PRINT statement to send the
code is:
PRINT "^code"
where
code is a two digit hexadecimal representation of the character to be printed.
An example that prints a message to a generic display device is shown below. The
example prints a blank line using the control codes ‘0D’(carriage return) and ‘0A’(line
feed) then prints the message on the next line:
PRINT “^0D^0ASpeed=“ ,G23
Control codes may be embedded anywhere in a message text string but must always be
preceded by the caret character (^).
Other control codes have specific functions when sent to the Allen-Bradley Operator
Terminal. The codes available are:
Code
Function
D0 Begin character blink field
D1 End character blink field
D2 Turn Fkey Mode display ON
D3 Turn Fkey Mode display OFF
D4 Lock Fkey Mode ON
D5 Lock Fkey Mode OFF
C0 Display Fkey Mode 1
C1 Display Fkey Mode 2
C2 Display Fkey Mode 3
C3 Display Fkey Mode 4
C4 Display Fkey Mode 5
C5 Display Fkey Mode 6
C8 Write to main program display
C9 Write to Xkey display
CA Write to Fkey display
CB Write to Error routine display
0D Carriage Return
0A Line Feed
1B Escape
The codes C8, C9, CA, and CB are used to print to different Operator Terminal screens
without affecting what your program is displaying. For example, use the code C9 in a
PRINT statement in an Xkey routine to display information while in the Xkey routine.
When the Xkey routine ends, the Operator Terminal will display what was shown
before the Xkey routine began.
Note: If Lock Fkey menu is used in a program, the lock will be turned OFF when the
program ends.
Print statements are not allowed in Scanned Event routines.
See Also READ