EIA-530
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EIA-530, or RS-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. It is to be used in conjunction with EIA-422 and EIA-423.
Two types of EIA-530 are defined: the Category 1, which uses the balanced characteristics of EIA-422, and Category 2, which is the unbalanced EIA-423.