![](/images/new-backgrounds/1319190/319190259x1.webp)
Standards and Specifications
External Connectors
External Connectors
RS-232 Serial Port
Conforms to
Pin Number | Function |
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1 | DCD |
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2 | RXD | 1 | 2 | 3 | 4 | 5 |
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3 | TXD |
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4 | DTR |
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5 | Ground |
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6 | DSR |
| 6 | 7 | 8 | 9 |
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7 | RTS |
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8 | CTS |
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9 | R1 |
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