If your device isn't listed try playing with the parameters. The chance is quite good (As most multimeter are rebranded) that you get it working with the settings for a different multimeter or by manually adjusting the parameters. If you find a new working device, please report to firstname.lastname@example.org. This way future users of this device can benefit from your help.
For a list of the currently supported multimeters go here.
If you really need to implement a new protocol start reading the documentation for DMMClass.