DCE / DTE Connection Description
Device’s Connector Pin # | Cable | |||||||||
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DCE DTE DCE DTE | 25/25 or | DCE DTE | ||||||||
| 9/25 pin | |||||||||
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3 | 1 | 1 |
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| (PG) | 1 | 1 | |||
2 | 3 | 2 Tx |
| Rx | 2 | 3 | ||||
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3 | 2 | 2 | 3 | Rx |
| Tx | 3 | 2 | ||
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8 | 7 | 5 | 4 RTS | CTS | 4 | 5 | ||||
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7 | 8 | 4 | 5 CTS | RTS | 5 | 4 | ||||
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6 | 6 | 6 | 6 |
| (DSR) | 6 | 6 | |||
5 | 5 | 7 | 7 |
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| SG |
| 7 | 7 | |
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1 | 1 | 8 | 8 |
| (CD) | 8 | 8 | |||
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| 9 | 9 |
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| 9 | 9 | ||||
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| 10 | 10 |
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| 10 | 10 | ||
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| 11 | 11 |
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| 11 | 11 | ||
12 12 (SCD) 12 12
13 13 (SCS) 13 13
14 14 (STD) 14 14
| 15 | 15 | (TC) | 15 | 15 | ||
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| 16 | 16 |
| (SRD) | 16 | 16 |
17 | 17 |
| (RC) | 17 | 17 | ||
| 18 | 18 |
| 18 | 18 | ||
| 19 | 19 |
| (SRS) | 19 | 19 | |
4 | 4 | 20 | 20 |
| (DTR) | 20 | 20 |
| 21 | 21 |
| (SQD) | 21 | 21 | |
9 | 9 | 22 | 22 | (RI) | 22 | 22 | |
23 23 (DRS) 23 23
24 24 (XTC) 24 24
25 25 | 25 25 |
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