Firewall Reference Guide

Is there a reference guide that explains lists the keywords & syntax for the digi transport firewall rules?

Example:
pass in break end proto tcp from 1.1.1.1/30 to 2.2.2.2/24

What are the different keywords that can be used?

Try page 471 of the user guide.

http://ftp1.digi.com/support/documentation/90001019_K.pdf