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| Signal | Abbreviation | DB9 |
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2 | Data Terminal Ready | DTR | 4 |
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3 | Transmitted Data | TD | 3 |
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4 | Signal Ground | SGND | 5 |
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5 | Ring Indicator | RI | 9 |
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6 | Received Data | RD | 2 |
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7 | DCD or DSR | DCD/DSR | 1 or 6 | |
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8 | Clear to Send | CTS | 8 |
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