As far as I know yes, 9 pin port is required. If you have a computer that does not have a serial port you need a USB/Serial port adaptor but not all are guaranteed to work. Better to use a docking station if notebook to get proper 9 pin serial port. And you'll need the 2115 manual which I don't have electronically. There's a simple combination/multiple key press that initiates firmware load once all is connected correctly. Can't remember precisely what the keys are.
shalom,

Best I can recall is, you need a 25 pin to a 9 pin "Special" Configured cable to Download and Upload the 2115. 9 pin goes to the computer. I have a 9 pin male to USB adapter cable from sewelldev.com that works good on a computer with no serial (9 pin) port.

Since you said "firmware not loaded", unless you have the firmware that goes to the meter (serialized), a cable is not going to help much.

The 2120 cable will work also.

Email me and I might can help you out a little more with info on the correct cable.

A search on the internet shows cables for sale.

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