The EMS-i manual for your console should have the pin out / socket in connection details for the scale.
Looking briefly at one of the manuals I hoovered up when considering buying an EMS-i system the scales appear to be standard TTL level quadrature output types. Unfortunately the D type connector pin assignments aren't completely standard between makes so you will need to verify that any scale of a different make has either the same pin-outs as the original or, if its different, that you can get an adapter cable.
M-DRO list the connector pin assignments for the scales they sell and have a range of adapter cables so it should be possible to sort out a suitable replacement. As far as I'm aware the scales M-DRO supply have the most common connector pin layout.
Clive