| Pin | Assignment | |
| 1 | DCD | Data Carrier Detect |
| 2 | RD | Receive Data |
| 3 | TD | Transmit Data |
| 4 | DTR | Data Terminal Ready |
| 5 | SG | Signal Ground |
| 6 | DSR | Data Set Ready |
| 7 | RTS | Request to Send |
| 8 | CTS | Clear to Send |
| 9 | RI | Ring Indicator |
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