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RS/EIA/TIA-423 is a standard for serial communications. It defines an unbalanced (single-ended) interface (similar to RS-232), with a single, unidirectional sending driver, and allows for up to 10 receivers (similar to RS-422). It is normally implemented in integrated circuit technology and can also be employed for the interchange of serial binary signals between DTE & DCE. There is no common pinout for RS-423. The BBC Micro computer used a 5-pin DIN connector. DEC used it extensively with a Modified Modular Jack connector. This was sometimes called "DEC-423". Use of a common ground is one weakness of RS-423 (and RS-232): if devices are far enough apart or on separate power systems, the ground will degrade between them and communications will fail, resulting in a condition that is difficult to trace. In this respect, balanced serial connections such as RS-422 or RS-485 are better,〔(National Semiconductor Application Note AN-1031 "TIA/EIA-422-B Overview", January 2000, National Semiconductor Inc. ) page 2 - evaluate the combination of cable length and data rate.〕 and Ethernet over twisted pair connections are better yet, because of the galvanic isolation provided by the signal transformers. ==See also== * Electronic Industries Alliance * RS-232 * RS-485 * Profibus * Fieldbus * List of network buses 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「RS-423」の詳細全文を読む スポンサード リンク
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