This KB explains how to identify the eWON type using the last 2 digits of its serial number, so using the Product Code digits.
How many Tags can I create on my eWON?
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