Pitney Bowes J640 - Manual (Page 106)

This table assumes that the defined Immediate Control
character is ^ and that the defined Status Polling Control
character is d. You may define these characters to suit your
needs.
Example ^CB
This command immediately cancels the batch currently
printing.
n
To use the Immediate Control character or the Status Polling
character within your data, use the tilde sequence.
J640 Programmer’s Manual
5-20