EIA-530
Currently known asTIA-530-A, but often called EIA-530, or RS-530, is a balanced serial interface standard that generally uses a 25-pin connector, originally created by the Telecommunications Industry Association.
Finalized in 1987 (revision A finalized in 1992[1]), 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 signaling characteristics. Because TIA-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 interchange circuits (AKA "signals" or "leads") between the DCE and DTE are defined in TIA-530: Category I, which uses the balanced characteristics of EIA-422, and Category II, which is the unbalanced EIA-423. Most of the interchange circuits are Category I, with the exception of Local Loopback (pin 18), Remote Loopback (pin 21), and Test Mode (pin 25) being Category II.
TIA-530 originally used Category I circuits for what is commonly called "Data Set Ready" (DCE Ready, pins 6 and 22) and "Data Terminal Ready" (DTE Ready, pins 20 and 23). Revision A [2] changed these interchange circuits to Category II (para 4.3.6 and 4.3.7 of the standard[3]) and added a "Ring Indicator" on pin 22. Pin 23 is grounded in TIA-530-A.
Confusion between the revisions has led to many incorrect wiring diagrams of this interface and most manufacturers still adhere to the original TIA-530 standard[4]. Care should be taken to ensure devices are of the same standard before connecting to avoid complications.
[edit] External links
Both of these references contain errors.
- TIA-530-A Standard for Purchase
- TIA-530-A bus description and pinout
- TIA-530 (RS-530) interface pinout and signals
[edit] Notes and references
- ^ ANSI/TIA/EIA-530-A. Arlington, VA: Telecommunications Industry Association. 2003.
- ^ ANSI/TIA/EIA-530-A. Arlington, VA: Telecommunications Industry Association. 2003.
- ^ ANSI/TIA/EIA-530-A. Arlington, VA: Telecommunications Industry Association. 2003. pp. 20.
- ^ http://global.ihs.com/doc_detail.cfm?currency_code=USD&customer_id=21254E2A3B0A&oshid=21254E2A3F0A&shopping_cart_id=292558332D4B404849594D5B260A&country_code=US&lang_code=ENGL&item_s_key=00136577&item_key_date=960711&input_doc_number=TIA-530&input_doc_title=
