Bristol Standard Asynchronous/Synchronous Protocol (BSAP) is an industrial automation protocol developed by Bristol Babcock and managed by
Emerson. It is a
master-slave protocol suited to both
synchronous high speed local networks and
asynchronous
Asynchrony is the state of not being in synchronization.
Asynchrony or asynchronous may refer to:
Electronics and computing
* Asynchrony (computer programming), the occurrence of events independent of the main program flow, and ways to deal with ...
low speed
wide area network
A wide area network (WAN) is a telecommunications network that extends over a large geographic area. Wide area networks are often established with leased telecommunication circuits.
Businesses, as well as schools and government entities, us ...
s. BSAP offers high message security for communication over telephone lines and radio networks by using effective error checking method (16 bit
CRC-CCITT) and constantly exchanging the communication statistics. The polling scheme used by BSAP makes sure that each node in the network has an equal priority for requests and responses. BSAP also provides a mechanism of global addressing of all nodes connected for special messages like time synchronization apart from the normal individual addressing schemes. BSAP supports
remote database access
Remote database access (RDA) is a protocol standard for database access produced in 1993 by the International Organization for Standardization (ISO). Despite early efforts to develop proof of concept implementations of RDA for major commercial RDBM ...
methods for reading and writing the memory in groups. It also supports multiple messaging schemes in which each node can transfer the node to other networks transparently and can transmit the responses in similar manner.
Protocol layers
The protocol supports different
layers
Layer or layered may refer to:
Arts, entertainment, and media
* ''Layers'' (Kungs album)
* ''Layers'' (Les McCann album)
* ''Layers'' (Royce da 5'9" album)
*"Layers", the title track of Royce da 5'9"'s sixth studio album
*Layer, a female Maveric ...
including application, transport, network, link and physical with 1745 asynchronous character oriented messages, 2111 transparent messages and 2629 conversational mode messages. The physical layer support includes the following options.
*
RS-232
In telecommunications, RS-232 or Recommended Standard 232 is a standard originally introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a ''DTE'' (''data terminal equipment'') such a ...
*
RS-485
* Leased phone line
* Satellite
*
Ethernet
Ethernet () is a family of wired computer networking technologies commonly used in local area networks (LAN), metropolitan area networks (MAN) and wide area networks (WAN). It was commercially introduced in 1980 and first standardized in 198 ...
* Cellular
See also
*
Computer network
A computer network is a set of computers sharing resources located on or provided by network nodes. The computers use common communication protocols over digital interconnections to communicate with each other. These interconnections are ...
*
Computer science
Computer science is the study of computation, automation, and information. Computer science spans theoretical disciplines (such as algorithms, theory of computation, information theory, and automation) to Applied science, practical discipli ...
*
Computing
Computing is any goal-oriented activity requiring, benefiting from, or creating computing machinery. It includes the study and experimentation of algorithmic processes, and development of both hardware and software. Computing has scientific, e ...
External links
BSAP basic detailsBSAP Programmers Reference{{List of automation protocols
Industrial computing
Serial buses
Industrial automation