DB-9 Port Pin Assignments
EIA Circuit | CCITT | Description | Switch’s DB9 | PC DB9 DTE | Modem DB25 | Signal |
| Signal |
| DTE Pin # | Pin # | DCE Pin # | Direction |
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CF | 109 | DCD (Data | 1 | 1 | 8 | |
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| Carrier |
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| Detected) |
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BB | 104 | RxD | 3 | 2 | 3 | |
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| (Received |
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| Data) |
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BA | 1033 | TxD | 2 | 3 | 2 | |
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| (Transmitted |
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| Data) |
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CD | 108 | DTR (Data | 6 | 4 | 20 | |
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| Terminal |
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| Ready) |
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AB | 102 | SG (Signal | 5 | 5 | 7 | |
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| Ground) |
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CC | 107 | DSR (Data | 4 | 6 | 6 | |
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| Set Ready) |
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CA | 105 | RTS | 8 | 7 | 4 | |
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| end) |
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CB | 106 | CTS | 7 | 8 | 5 | |
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| d) |
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CE | 125 | RI (Ring | 9 | 9 | 22 | |
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| Indicator) |
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Console Port to 9-Pin COM Port on PC
Switch’s | CCITT Signal |
| PC’s |
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1 DCD | 1 | ||
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2 TXD | 2 | ||
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WGS3 Layer 3 Switch User’s Manual | - 253 - |