Chapter 2 Configuring the
Another method using a text editor would be to do a CHANGE command replacement to convert the characters to ASCII characters. This is shown as:
\ADD 1
1ESC&142WabcdefghijklmnopqrstuvwxyzABCDEFGHIJ
2//
\CHANGEQ 7/7 TO ’00 \CHANGEQ 8/8 TO ’05 \CHANGEQ 9/9 TO ’00
.
.
.
\CHANGEQ 48/48 TO ’06
This could also be input by not entering the letters, but simply changing the specific column to the desired ASCII character. In the above example the “abc... HIJ” would not be entered and the CHANGE command would be used as follows:
\CHANGEQ 7 TO '00 \CHANGEQ 8 TO '05
.
.
.
As you can see, the escape sequence for the Programmable VFC can be quite complicated. This should only be used after attempting to satisfy VFC requirements using the standard (computed) VFC and the TEXT and PAGE LENGTH escape sequences.
The most common errors in successfully implementing the Programmable VFC escape sequence usually involve improper VFC byte counting or attempting to manipulate “unprintable” characters and getting confused. Converting these “unprintable” characters to printable ones is the easiest way to avoid data entry confusion.
Summary of Recommended Steps to Implement Programmable VFC
1.Layout the required VFC in a standard channel
2.Reverse the resulting bit image so that channel 1 is now where channel 16 was and channel 16 is now where channel 1 was.
3.Divide this 16 bit image into two
4.Decode these
5.Enter these characters into the Programmable VFC escape sequence as the VFC data. This data MUST be an even byte count and is CASE SENSITIVE (upper/lower). As in all escape sequences, do not include the brackets ([ ]); they are for clarification only.
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