Is Data Highway Plus supported and at what baud rate?

Data Highway Plus is a communications protocol only between Rockwell PLC controllers. Hardy Instruments controllers (including the HI 2110WI, HI 2151/30WC, HI 3010, HI 3030, HI 4050, and HI 4060) communicate using RIO, Ethernet I/P, ControlNet, or DeviceNet communications to scanner modules in the PLC backplanes. This scanner is built into some PLC's, but a scanner module is required on all others including Data Highway Plus.
NOTE:  The RIO option is no longer available for sale on the HI 3010 or HI 3030 units.

The RIO baud rates are 57.6K, 115.2K, or 230.4K.

There is additional information in the manual for the particular model Hardy Instrument you have. Manuals are available online at www.hardysolutions.com under on-line support, then manuals.  

NOTE:  Not all Hardy units have all the communications option listed above.  Check the manual for your specific model Hardy Instrument for information on available communications type.