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Mike sent the information on how to access the data:

The attached photo shows the connections that will give you the voltage as
it is presented to the A/D. These are real time readings that have not been
linearized or massaged at all by the CPU. There are logging voltmeters that
can be connected to serial ports. I'm sure Cornell has these around
somewhere.

The other method that we discussed was to log the data via modbus. We use a
program called Modbus Poll. I have provided the link below. The cost is $99
for a single license, but it is free fro a limited period, I'm not sure how
long that period is.

http://www.modbustools.com/index.asp

If anyone there knows programming and is familiar with modbus they can write
something to get the data.

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If you need RS485 converters we use B & B (bb-elec.com). For RS485 to RS232 we recommend Part #485D9TB
$74.95 for RS485 to USB we recommend Part # USOTL4 $139.95.