There are currently four connection strings defined, all of which are ethernet related. DMX delivered via RS-485 transmission is not defined. While it may be a bit illogical to use RS-485 DMX transmission if a network connection is also available for CITP communication, it is not disallowed.
A DMX E1.11 connection string should be added. Since a fixture/server is ignorant of "universe" and only has start "channel" information, the string would be something like "DMXE111/<channel>".