EIA-530 / 530-A Pin-Out


DB-25 Connector Pin Out

Pin Name   Function EIA-530                    Function EIA-530-A
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1          Shield                              Shield
2    BA    Transmitted Data (A)                Transmitted Data (A) 
3    BB    Received Data (A)                   Received Data (A) 
4    CA    Request To Send (A)                 Request To Send (A) 
5    CB    Clear To Send (A)                   Clear To Send (A)
6    CC    DCE Ready (A)                       DCE Ready 
7    AB    Signal Common                       Signal Common 
8    CF    Received Line Signal Detector (A)   Received Line Signal Detector (A)
9    DD    Receive Signal Timing (B)           Receive Signal Timing (B)
10   CF    Received Line Signal Detector (B)   Received Line Signal Detector (B)
11   DA    DTE Transmitter Timing (B)          DTE Transmitter Timing (B)
12   DB    DCE Transmitter Timing (B)          DCE Transmitter Timing (B)
13   CB    Clear to Send (B)                   Clear to Send (B)
14   BA    Transmitted Data (B)                Transmitted Data (B)
15   DB    DCE Transmitter Timing (A)          DCE Transmitter Timing (A)
16   BB    Received Data (B)                   Received Data (B)
17   DD    Receiver Signal Element Timing (A)  Receiver Signal Element Timing (A)  
18   LL    Local Loopback                      Local Loopback
19   CA    Request to Send (B)                 Request to Send (B)
20   CD    DTE Ready (A)                       DTE Ready  
21   RL    Remote Loopback                     Remote Loopback
22   CC    DCE Ready (B)                       Ring Indicator 
23   DA    DTE Ready (B)                       Signal Common 
24   DA    DTE Transmitter Timing (A)          DTE Transmitter Timing (A)
25   TM    Test Mode                           Test Mode