Published by pchipkin April 23rd, 2007
in Andover Continuum.
BACnet clients must respect the servers report of supported services
In BACnet when a client connects to a server it has the responsibility of enquiring what services the server supports and then only using the supported services. In BACnet a server should be driven to a failed state if it receives a message requesing a […]
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Published by Steven Smethurst April 13th, 2007
in RS485.
EIA-485 (formerly RS-485 or RS485) is a specification for the physical layer of a network that uses the difference in voltages between two wires (Three wire) to conveys data.
One polarity of voltage indicates a logic 1, the reverse polarity indicates logic 0. The difference of potential must be at least 0.2 volts for valid operation, […]
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Published by Steven Smethurst April 12th, 2007
in BACnet MSTP and RS485.
RS485 needs 3 conductors and a shield. Many people say its a two wire network but it is not.
Two conductors are used to carry the RS485 Differential voltage signal.
The Shield is connected to earth/ground at one end only and provides shielding against induced noise.
So why the 3rd conductor ?
The driver sends data by modulating the […]
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Published by Steven Smethurst April 11th, 2007
in Site.
We are looking for people to write short (400+ word) articles about industrial and building automation, Industrial communication protocols, BACnet, Lonworks, Modbus, Metasys N2, Tridium, Continuum etc
All articles will have an author statement at the bottom that credits you for your work. A lot of employers search the internet for applicant’s names before hiring them. […]
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