Keywords:
Application layer, Applications, Bus systems, Buses (data processing), Circuit networks, Communication, Computer applications, Computerized control, Control, Control equipment, Control systems, Control technology, Data bus, Data communication, Data exchange, Data interface, Data line, Data link system, Data network, Data processing, Data services, Data transfer, Data transmission control procedures, Definitions, Digital, Digital data, Digital engineering, EDP, Electronic instruments, Electronic systems, English language, Field bus, Guidance systems, Industrial, Industrial facilities, Information interchange, Information processing, Information technology, Interfaces (data processing), Open systems interconnection, Operational techniques, OSI, Physical layers, Process control engineering, Services, Specification, Specification (approval), Transmission media