IEC 60935:1996

Defines a modular data-bus system for data acquisition, data
processing and control. Gives mechanical, signal, electrical and
protocol specifications that are sufficient to assure compatibility
between units from different sources of design and production.
Applies to systems consisting of modular electronic instrument
units that process or transfer data or signals, normally in
association with computers or other automatic data processors. Is
used for nuclear instrumentation and control systems and other
applications. See IEC 61052.