BOM-DAT/CONN-DAT/DB9-dat/DB9-dat.md
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# DB9-dat
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-| - | DB9 | RS232 | RS422 | RS485 |
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-| --- | --- | ----- | ----- | ----- |
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-| | 1 | DCD | T- | DATA- |
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-| | 2 | RX | T+ | DATA+ |
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-| | 3 | TX | R+ | NC |
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-| | 4 | DTR | R- | NC |
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-| | 5 | GND | GND | GND |
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-| | 6 | DSR | RTS- | NC |
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-| | 7 | RTS | RTS+ | NC |
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-| | 8 | CTS | CTS+ | NC |
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-| | 9 | RI | CTS- | NC |
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-| | 10 | NC | NC | NC |
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+- [[RS232-dat]] - [[RS485-dat]]
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+
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+| - | DB9 | RS232 | RS422 | RS485 |
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+| --- | --- | ----- | ------- | ---------- |
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+| | 1 | DCD | T- = A+ | DATA- = A+ |
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+| | 2 | RX | T+ = B- | DATA+ = B- |
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+| | 3 | TX | R+ = A+ | - |
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+| | 4 | DTR | R- = B- | - |
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+| | 5 | GND | GND | GND |
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+| | 6 | DSR | RTS- | - |
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+| | 7 | RTS | RTS+ | - |
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+| | 8 | CTS | CTS+ | - |
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+| | 9 | RI | CTS- | - |
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+| | 10 | - | - | - |
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![](21-42-14-27-03-2023.png)
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![](2024-08-09-16-21-14.png)
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## ref
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- [[DB9]]
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Tech-dat/tech-dat.md
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## Category
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+### CONN
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+
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+- [[db9-dat]]
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+
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### Processing
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- [[mcu-dat]] - [[SBC-dat]] - [[RPI-dat]]