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EIA/TIA-530 Reference
Pin # Source Description Comments
1 - Shield
2 DTE Transmit Data A Balanced
3 DCE Receive Data A Balanced
4 DTE Request To Send A Balanced
5 DCE Clear To Send A Balanced
6 DCE DCE Ready A Balanced
7 - Signal Ground AB
8 DCE Received Line Signal Balanced
Detect A
9 DCE Receiver Timing B Balanced
10 DCE Received Line Signal Balanced
Detect B
11 DTE External Transmit Timing B Balanced
12 DCE Transmit Timing B Balanced
13 DCE Clear To Send B Balanced
14 DCE Transmit Data B Balanced
15 DCE Transmit Timing A Balanced
16 DCE Receive Data B Balanced
17 DCE Receive Timing A Balanced
18 DTE Local Loopback Unbalanced
19 DTE Request To Send B Balanced
20 DTE DTE Ready A Balanced
21 DTE Remote Loopback Unbalanced
22 DCE DCE Ready B Balanced
23 DTE DTE Ready B Balanced
24 DTE External Transmit Timing A Balanced
25 DCE Test Mode Unbalanced
Connector:
DB-25 Connector. DTE devices normally use a male connector, DCE devices normally use a female connector.
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