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RS530

General
RS530 was approved in March 1987. The RS530 interface is a generic connector specification. It's not an actual interface. The connector pinning can be used to support RS422, RS423, V.35 and X.21 to name the most popular ones. The purpose is to replace the large RS449 Sub-D37 connector.

Sub-D25M Sub-D25F
MaleFemale
Pin Signal Abbr. Circuit Name DTE DCE Paired with
1 Shield         18
2 Transmitted Data TxD BA Out In 14
3 Received Data RxD BB In Out 16
4 Request To Send RTS CA Out In 19
5 Clear To Send CTS CB In Out 13
6 Data Set Ready DSR CC In Out 22
7 Signal Ground SGND Ground     21
8 Data Carrier Detect DCD CF In Out 10
9 Rtrn Receive Sig. Elmnt Timing   DD In Out 17
10 Rtrn DCD   CF In Out 8
11 Rtrn Transmit Sig. Elmnt Timing   DA Out In 24
12 Rtrn Transmit Sig. Elmnt Timing   DB In Out 15
13 Rtrn CTS   CB In out 5
14 Rtrn TxD   BA Out In 2
15 Transmit Signal Element Timing   DB In Out 12
16 Rtrn RxD   BB In Out 3
17 Receive Signal Element Timing   DD In Out 9
18 Local Loopback LL LL Out In 1
19 Rtrn RTS   CA Out In 4
20 Data Terminal Ready DTR CD Out In 23
21 Remote Loopback RL RL Out In 7
22 Rtrn DSR   CC In Out 6
23 Rtrn DTR   CD Out In 20
24 Transmit Signal Element timing   DA Out In 11
25 Test Mode   TM In Out  

RS530 implementation options

DCEDTE
RS530RS232V.35X.21
11A1
22P2
33R4
44C 
55D 
66E 
77B 
88F 
9-X 
10-- 
11-W 
12-AA 
13-- 
14-S 
1515Y 
16-T 
1717V 
18-- 
19-- 
2020- 
21-- 
22-- 
23-B 
24-U 
25-- 

Resources: