| Pin | Signal | Pin | Signal | | 1 | Ground | 13 | 2nd CTS | | 2 | Transmit Data | 14 | 2nd TXD | | 3 | Receive Data | 15 | Transmit Clock | | 4 | Request to Send | 16 | 2nd Receive | | 5 | Clear to Send | 17 | Receive Clock | | 6 | Data Set Ready | 18 | Unassigned | | 7 | Ground | 19 | 2nd RTS | | 8 | Carrier Detect | 20 | DTR Ready | | 9 | Reserved | 21 | Signal Quality | | 10 | Reserved | 22 | Ring Indicator | | 11 | Unassigned | 23 | Data Rate Select | | 12 | 2nd CD | 24 | Transmit Clock |
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