Which MIB files are for TS 4 H MEI and TS 4 H? Dose any MIB provide the device serial number info?

I want to poll the Serial number. Software version and SNMP location of Digi TS 4 H MEI and TS 4 H by WUG. What MIB files do I need?

The MIB files can be found here:

http://www.digi.com/support/productdetail?pid=1954&type=utilities

The serial number can only be obtained from the sticker on the unit itself and is not programmed into the firmware.