This KB explains how to identify the eWON type using the last 2 digits of its serial number, so using the Product Code digits.
The eWON comcfg.txt file contains information about the modem type which eWON tries to detect at eWON boot. (Parameters ModExpType and ModFrcType).
Maximum distances for a Leased Line connection
How to change the IP address of an Omron PLC using CX-Programmer
To customise the alarm notification process even further, for example sending different information depending on the alarm state, you can use scripting.