Computer Hardware Terms, Glossary and Dictionary

EIA-530, also known as RS-530 or TIA-530, is a balanced serial interface standard that generally uses a 25-pin connector. The specification defines the cable between the DTE and DCE devices. It is a replacement for EIA-449, which uses 37-pin connector. EIA-530 refers to two electrical implementations of EIA/TIA-449: RS-422 for balanced transmission and RS-423 for unbalanced transmission.

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EIA-530