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Connecting a multidrop 485 network. The EIA RS-485 Specification labels the data wires "A" and "B", but many manufacturers label their wires "+" and "-". In our experience, the "-" wire should be connected to the "A" line, and the "+" wire to the "B" line.
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www.bb-elec.com/tech_articles/rs485_basics.asp
www.bb-elec.com/tech_articles/rs485_basics.asp
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Network Topologies; Network configuration isn't defined in the RS-422 or RS-485 specification. In most cases the designer can use a configuration that best fits the physical requirements of the system.
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www.bb-elec.com/tech_articles/rs422_485_app_note/system...
www.bb-elec.com/tech_articles/rs422_485_app_note/system_configuration.asp
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The RS485 standard. Tutorial about the RS485 specification and use. Comparison with other interfaces. ... Introduction to RS485 ... RS232, RS422, RS423 and RS485 are serial communication methods for computers and devices. RS232 is without doubt the best known interface, because this serial interface is implemented on almost...
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www.lammertbies.nl/comm/info/RS-485.html
www.lammertbies.nl/comm/info/RS-485.html
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The modbus interface. Tutorial about the modbus specification and use. ASCII and RTU communication covered. ... The original Modbus interface ran on RS-232, but most later Modbus implementations used RS-485 because it allowed longer distances, higher speeds and the possibility of a true multi-drop network.
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www.lammertbies.nl/comm/info/modbus.html
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EIA-485 - Wikipedia, the free encyclopedia
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EIA-485 , also known as TIA/EIA-485 or RS-485, is a standard defining the electrical characteristics of drivers and receivers for use in balanced digital multipoint systems. The standard is publi...
en.wikipedia.org/wiki/EIA-485
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I'm trying to find out the limitations of RS-485. I need to get a hold of the spec or some equivilent source to find out the distance (ie 1000ft.) that a given data rate (ie 1MHz)can travel on a given wire gauge (ie 26awg).
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www.eng-tips.com/gviewthread.cfm/lev2/11/lev3/47/pid/24...
www.eng-tips.com/gviewthread.cfm/lev2/11/lev3/47/pid/240/qid/1804
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The RS-422 specification recommends 24AWG twisted pair cable with a shunt capacitance of 16 pF per foot and 100 ohm characteristic impedance. While the RS-485 specification does not specify cabling, these recommendations should be used for RS-485 systems as well.
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www.arcelect.com/485info.htm
www.arcelect.com/485info.htm
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Information and tools relating to RS-232, RS-485, and similar serial links and networks. ... Serial links and networks, including RS-232, RS-485, COM ports, and USB virtual COM ports.
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www.lvr.com/serport.htm
www.lvr.com/serport.htm
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EIA standards where previously marked with the prefix "RS" to indicate recommended standard; however, the standards are now generally indicated as ... The specification allows for data transmission from one transmitter to one receiver at relatively slow data rates (up to 20K bits/second) and short distances (up to 50Ft. @
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www.rs485.com/rs485spec.html
www.rs485.com/rs485spec.html
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