| 词条 | OpenWebNet | |||||||||||||||||||||||||
| 释义 |
OpenWebNet is a communications protocol developed by Bticino since 2000. The OpenWebNet protocol allows a "high-level" interaction between a remote unit and Bus SCS of MyHome domotic system. The latest protocol evolution has been improved to allow interaction with well-known home automation systems like KNX and DMX512-A system, by using appropriate gateways. The OpenWebNet protocol is disclosed on MyOpen community. OpenWebNet ProtocolThe protocol is thought to be independent from the used technology. For example, it is possible to use a supervisor software connected via Ethernet, via serial RS-232 or via USB to a gateway that is directly connected to a domotic system. Everyone can require protocol message extension. It is enough to propose your own RFC. It will be examined and disclosed if it respects OpenWebNet syntax. SyntaxAn OpenWebNet message is structured with variable length fields separated by the special character '*' and closed by '##'. The characters admitted in the fields are numbers and the character “#”. The structure of a message is therefore:
The following fields are admitted: WHO WHAT WHERE DIMENSION VALUE WHOIt characterizes the domotic system function to which the OpenWebNet message is referred. For example: WHO = 1, characterizes the messages for lighting system management. WHATIt characterizes an action to do or a status to read. For every WHO (and therefore for every function) there is a specific WHAT table. The field WHAT can also contain optional parameters: WHAT#PAR1#PAR2… #PARn. Example of actions: switch ON light, dimmer to 75%, switch DOWN shutter, radio ON, etc. Example of status: light ON, active alarm, battery unload, etc. WHEREIt characterizes the set of objects to which the OpenWebNet message is referred. It can be a single object, a group of objects, a specific environment, the entire system, etc. For every WHO (and therefore for every function) there is a specified WHERE table. The tag WHERE can also contain optional parameters: WHERE#PAR1#PAR2… #PARn. Example of where: all the lights of group 1, sensor 2 of zone 1 of alarm system, etc. DIMENSIONIs a range of value that characterizes the dimension of the object to which the message is referred. For every WHO (and therefore for every function) there is a specific DIMENSION table. It’s possible to require/to read/to write the value of one dimension. Every dimension has a prefixed number of values, described in VALUE field. Example of dimension: sensor temperature, loudspeaker volume, firmware version of a device, etc. VALUEIt characterizes the read/written value of a written/required/read dimension. MessageThere are 4 types of OpenWebNet Message:
Request: Read: Write: Acknowledge MessageACK: NACK: Gateway OpenWebNetIt is possible to interact with the SCS home automation bus by using a specific gateway. There are two typologies of gateways that allow a connection to the field bus by using different standard protocols:
Gateway EthernetThe current implementation by BTicino is also an embedded web server. It works as a translator between OpenWebNet messages via TCP/IP and the SCS messages transmitted on the SCS bus. It is possible to control three different kinds of buses:
The Ethernet gateway offers two modes of authentication:
Gateway USB or RS232The gateway is an interface that works as a translator between the OpenWebNet messages transmitted on USB or serial and the SCS messages transmitted on the SCS bus. Functions
ExampleOpenWebNet message examples Command MessageSwitch Off of light 77 WHO = 1 WHAT = 0 WHERE = 77 Status MessageScenario 1 of scenario unit 23 activated. WHO = 0 WHAT = 1 WHERE = 23 Request status messageStatus request of probe 1 WHO = 4 WHERE = 1 Request Dimension MessageRequest of Temperature Measured, probe 44 WHO = 4 WHERE = 44 DIMENSION = 0 Read Dimension MessageTemperature Measured, probe 44 WHO = 4 WHERE = 44 DIMENSION = 0 VALUE1 = 0251 (T=+25,1 °C) VALUE2 = 2 (System in "cooling mode") Write Dimension MessageVolume set at 50%, environment 2 WHO = #16 WHAT = #2 WHERE = #1 DIMENSION = 1 VALUE1 = 16 See also
References
External links
3 : Computer buses|Building automation|Home automation |
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