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ISO 14230
Keyword Protocol 2000, abbreviated KWP2000, is a communications protocol used for on-board vehicle diagnostics systems (OBD). This protocol covers the application layer in the OSI model
OSI model
of computer networking. The protocol is standardized by International Organization for Standardization as ISO 14230. KWP2000 also covers the session layer in the OSI model, in terms of starting, maintaining and terminating a communications session. Commonly used physical layers[edit] One underlying physical layer used for KWP2000 is identical to ISO 9141, with bidirectional serial communication on a single line called the K-line. In addition, there is an optional L-line for wakeup. The data rate is between 1.2 and 10.4 kilobaud, and a message may contain up to 255 bytes in the data field. When implemented on a K-line physical layer KWP2000 requires special wakeup sequences: 5-baud wakeup and fast-initialisation
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Communications Protocol
In telecommunication, a communication protocol is a system of rules that allow two or more entities of a communications system to transmit information via any kind of variation of a physical quantity. The protocol defines the rules syntax, semantics and synchronization of communication and possible error recovery methods. Protocols may be implemented by hardware, software, or a combination of both.[1] Communicating systems use well-defined formats (protocol) for exchanging various messages. Each message has an exact meaning intended to elicit a response from a range of possible responses pre-determined for that particular situation. The specified behavior is typically independent of how it is to be implemented. Communication protocols have to be agreed upon by the parties involved.[2] To reach agreement, a protocol may be developed into a technical standard
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PROFIBUS
PROFIBUS (Process Field Bus) is a standard for fieldbus communication in automation technology and was first promoted in 1989 by BMBF (German department of education and research) and then used by Siemens. It should not be confused with the PROFINET standard for Industrial Ethernet. PROFIBUS is openly published as part of IEC 61158.Contents1 Origin 2 Technology2.1 Application layer 2.2 Security layer2.2.1 No data 2.2.2 Variable length data 2.2.3 Fixed length data 2.2.4 Token 2.2.5 Fields 2.2.6 Service Access Points2.3 Bit-transmission layer3 Profiles 4 Organization 5 See also 6 References 7 External linksOrigin[edit] The history of PROFIBUS goes back to a publicly promoted plan for an association which started in Germany in 1986 and for which 21 companies and institutes devised a master project plan called "fieldbus". The goal was to implement and spread the use of a bit-serial field bus based on the basic requirements of the field device interfaces
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Service Request Transport Protocol
Service Request Transport Protocol (GE-SRTP) protocol is developed by GE Intelligent Platforms (earlier GE Fanuc) for transfer of data from PLCs. The protocol is used over Ethernet
Ethernet
almost all GE automation equipment supports the GE-SRTP protocol when equipped with an Ethernet Port
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Highway Addressable Remote Transducer Protocol
The HART Communication Protocol (Highway Addressable Remote Transducer) is a hybrid analog+digital industrial automation protocol. Its most notable advantage is that it can communicate over legacy 4–20 mA analog instrumentation current loops, sharing the pair of wires used by the analog only host systems. According to Emerson,[1] due to the huge installed base of 4–20 mA systems throughout the world, the HART Protocol is one of the most popular industrial protocols today. HART protocol has made a good transition protocol for users who wished to use the legacy 4–20 mA signals, but wanted to implement a "smart" protocol. The protocol was developed by Rosemount Inc., built off the Bell 202 early communications standard in the mid-1980s as a proprietary digital communication protocol for their smart field instruments. Soon it evolved into HART and in 1986 it was made an open protocol
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SDS Protocol
Smart Distributed System (SDS) protocol was developed by Honeywell
Honeywell
and is supported by Holjeron. SDS is an open event-driven protocol used over Controller area network
Controller area network
based industrial networks. It is used for a highly reliable Smart device-level network
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HostLink Protocol
HostLink[1] is communication protocol for use with or between PLC's made by Omron. It is an ASCII-based protocol generally used for communication over RS232
RS232
or RS422. The protocol enables communication between various pieces of equipment in an industrial environment for programming or controlling those pieces of equipment. The maximum allowed message size is 30 words per message. Larger messages can be sent by 'fragmentation' process, where the same slave returns a series of messages to build up the entire response. PLC host computers can transfer procedures, and monitor PLC data area, and control the PLC using the HostLink protocol. External links[edit]Hostlink Command FormatReferences[edit]^ "Archived copy". Archived from the original on 2012-07-31
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INTERBUS
INTERBUS is a serial bus system which transmits data between control systems (e.g., PCs, PLCs, VMEbus
VMEbus
computers, robot controllers etc.) and spatially distributed I/O modules that are connected to sensors and actuators (e.g., temperature sensors, position switches). The INTERBUS system was developed by Phoenix Contact
Phoenix Contact
and has been available since 1987
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MECHATROLINK
MECHATROLINK is an open protocol used for industrial automation, originally developed by Yaskawa
Yaskawa
and presently maintained by Mechatrolink Members Association (MMA).[1] Mechatrolink protocol has two major variants:MECHATROLINK-II—Defines protocol communication schemes through serial link equivalent to RS485
RS485
with a maximum speed of 10Mbit/s and maximum 30 slave nodes. MECHATROLINK-III—Defines protocol communication schemes over Ethernet
Ethernet
with a maximum speed of 100Mbit/s and maximum 62 slave nodes.References[edit]^ "Archived copy". Archived from the original on 2013-06-07
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MelsecNet
MelsecNet[1] is a protocol developed and supported by Mitsubishi Electric for data delivery. MelsecNet supports 239 networks.[citation needed] MelsecNet protocol has two variants. MELSECNET/H and its predecessor MELSECNET/10 use high speed and redundant functionality to give deterministic delivery of large data volumes. Both variants can use either coaxial bus type or optical loop type for transmission. Coaxial bus type uses the token bus method with overall distance of 500 metres (550 yards) but optical loop type uses the token ring method and can support a distance up to 30 kilometres (19 miles). MELSECNET/H can support a maximum of 19,200 bytes/frame and maximum communication speed of 25 Mbit/s. MELSECNET/10 supports 960 bytes/frame and a baud rate of 10 Mbit/s
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Modbus
Modbus is a serial communications protocol originally published by Modicon (now Schneider Electric) in 1979 for use with its programmable logic controllers (PLCs). Modbus has become a de facto standard communication protocol and is now a commonly available means of connecting industrial electronic devices.[1] The main reasons for the use of Modbus in the industrial environment are:developed with industrial applications in mind, openly published and royalty-free, easy to deploy and maintain, moves raw bits or words without placing many restrictions on vendors. Modbus enables communication among many devices connected to the same network, for example, a system that measures temperature and humidity and communicates the results to a computer. Modbus is often used to connect a supervisory computer with a remote terminal unit (RTU) in supervisory control and data acquisition (SCADA) systems
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Optomux
Optomux [1] is a serial (RS-422/RS485) network protocol originally developed by Opto 22 in 1982 which is used for industrial automation applications. Optomux is an ASCII
ASCII
protocol consisting of command messages and response messages containing data from an Optomux unit & contain a message checksum to ensure secure communications. The serial data link is very reliable, over distances up to 4,000 feet and is suitable for extreme safety applications. An Optomux system is typically made up of three main elements:There must be a host device to poll the Optomux brain boards. There are the brain boards themselves, anywhere from one to 255 of them. Each Optomux brain board attaches to an I/O mounting rack, carrying the individual I/O modules.Limitation[edit] The primary performance limitation of the Optomux system is the slow serial data link
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PieP
Process Image Exchange Protocol (PieP) is a very simple Fieldbus protocol used for process automation. It is an application layer protocol developed over TCP/IP. PieP uses method of transferring process images between I/O Devices and the PLC which makes the protocol simple to use
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Profinet
PROFINET (profinet acronym for Process Field Net) is an industry technical standard for data communication over Industrial Ethernet, designed for collecting data from, and controlling, equipment in industrial systems, with a particular strength in delivering data under tight time constraints (on the order of 1ms or less).[1] The standard is maintained and supported by Profibus
Profibus
& Profinet International, an umbr
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Foundation Fieldbus H1
FOUNDATION Fieldbus H1 is one of the FOUNDATION fieldbus protocol versions. FOUNDATION H1 (31.25 kbit/s) is a bi-directional communications protocol used for communications among field devices and to the control system. It utilizes either twisted pair, or fiber media to communicate between multiple nodes (devices) and the controller. The controller requires only one communication point to communicate with up to 32 nodes, this is a significant improvement over the standard 4-20 mA communication method which requires a separate connection point for each communication device on the controller system. From a business standpoint, FOUNDATION Fieldbus technology delivers savings in total installation costs. H1 Fieldbus reduces instrument wiring, which means less termination and fewer screwdriver turns. The technology reduces hardware requirements and lowers Capital Expenditures (CAPEX)
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RAPIEnet
RAPIEnet
RAPIEnet
(Real-time Automation Protocols for Industrial Ethernet) is Korea's first Ethernet
Ethernet
international standard for real-time data transmission.An Ethernet-based industrial networking p
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