Individual Port Pinouts—DB9 and DB25 Male
RS-232
| DB9 |
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| DB25 | ||
Pin No. | Signal |
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| Pin No. | Signal |
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1 | DCD | 2 | TxD | |||
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2 | RxD | 3 | RxD | |||
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3 | TxD | 4 | RTS | |||
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4 | DTR | 5 | CTS | |||
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5 | GND | 6 | DSR | |||
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6 | DSR | 7 | GND | |||
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7 | RTS | 8 | DCD | |||
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8 | CTS | 20 | DTR | |||
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| DB9 |
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| DB25 | ||
Pin No. | Signal |
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| Pin No. | Signal |
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1 | DCD | 2 | TxD | |||
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2 | RxD | 3 | RxD | |||
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3 | TxD | 4 | RTS | |||
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4 | DTR | 5 | CTS | |||
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5 | GND | 6 | DSR | |||
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6 | DSR | 7 | GND | |||
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7 | RTS | 8 | DCD | |||
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8 | CTS | 20 | DTR | |||
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