UFC 3 -430-11
14 February 2001
definition of the RS -485 bus. Modbus protocol is an open industry standard that was
originally created and defined by the Modicon Company. Other industry communication
bus standards include:
Fieldbus -- A hardware and software protocol standard created and
maintained by the Fieldbus Foundation. The Fieldbus Foundation is a
not-for-profit organization that consists of more than 100 of the world's
leading control and instrumentation suppliers and end users.
DeviceNet -- A hardware and software protocol standard maintained by the
Open DeviceNet Vender Association (ODVA). The ODVA is an
independent organization that works closely with vender members, end
users, and distributors to further establish DeviceNet as an open
communications network in industry automation.
HART -- An open hardware and software protocol standard that was
originally created and defined by the Rosemount Company.
Honeywell -- A family of p roprietary hardware and software protocol
standards (e.g. the D -E bus) that are licensed products of the
Honeywell Company.
Allen-Bradley-- A family of proprietary hardware and software protocol
standards (e.g. the Data Highway + bus) that are licensed p roducts of
the Allen-Bradley Company.
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