- RS-449
The RS-449 specification, also known as EIA-449 or TIA-449, defines the functional and mechanical characteristics of the interface between data terminal equipment and data communications equipment.
The electrical signaling standards intended for use with RS-449 are RS-422 for balanced signals, and
RS-423 for the unbalanced signals, with data rates to 2 Mbit/s. The standard specifies DC-37 and DE-9 for the primary and secondary data circuits. Though never applied onpersonal computer s, this interface is found on some network communication equipment. The full title of the standard is "EIA-449 General Purpose 37-Position and 9-Position Interface for Data Terminal Equipment and Data Circuit-Terminating Equipment Employing Serial Binary Data Interchange".EIA-449-1 was rescinded in January, 1986. Superseded by EIA/TIA-530-A, the final version EIA-449-1 was withdrawn in September, 2002. [cite web |url=http://www.tiaonline.org/standards/catalog/search.cfm |title= TIA Standards Documents |accessdate= 2008-01-19]
External links
* [http://www.tiaonline.org/standards/ EIA/TIA Standards]
* [http://pinouts.ru/SerialPorts/eia449_pinout.shtml RS-449 interface pinout and signals]References
* Electronics Industries Association, "EIA Standard 449" November 1977, reprinted in Telebyte Technology "Data Communication Library" Greenlawn NY, 1985, no ISBN, no Library of Congress card number
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