The start and stop characters are ASCII 203 and 204 in decimal, or CB
and CC in hexadecimal, as defined by the Interleaved 2 of 5 Barcode
(ITF) standard:
http://www.idautomation.com/itffaq.html

If you look at the end of the Make2of5Barcode function in Builtins.js
(line 2233 in my copy), you can see these codes being applied:

  barcode = "\xCB" + barcode +  "\xCC";  

The checksum digit, if requested, is placed before the ending "stop"
character.  Note that, while the stop and start characters are always
included by the Make2of5Barcode function, whether the checksum is
calculated or not, the template rule will strip off the start and stop
characters if the box is left unchecked (although I think that removing
these characters is non-standard).

Again, this is all based on the standard.  However, one of the great
things about standards is that there are so many of them!  So it's
possible that your client may be expecting a different variation.  If
you need different start and stop codes, or any different algorithm, I
suggest converting your rule to JavaScript, and then copying-and-pasting
the code from the Make2of5Barcode function in Builtins.js into your own
JavaScript function and modifying the logic as needed.  But please do
not modify the installed Builtins.js file, or the installed rule
template XML files.

Dan


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