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 to be used in conjunction with EIA-422 and EIA-423, which define the electrical signalling characteristics. Because EIA-530 calls for the more common 25 pin connector, it displaced the similar EIA-449, which also uses EIA-422/423, but a larger 37-pin connector.

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.

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