| Pin 1 | Chassis Ground |
|---|---|
| Pin 2 | Transmit Data |
| Pin 3 | Receive Data |
| Pin 4 | Request To Send |
| Pin 5 | Clear To Send |
| Pin 6 | Data Set Ready |
| Pin 7 | Signal Ground |
| Pin 8 | Carrier Detect |
| Pin 9 | Unused |
| Pin 10 | Unused |
| Pin 11 | Unused |
| Pin 12 | Unused |
| Pin 13 | Unused |
| Pin 14 | Unused |
| Pin 15 | Unused |
| Pin 16 | Unused |
| Pin 17 | Unused |
| Pin 18 | Unused |
| Pin 19 | Unused |
| Pin 20 | Data Terminal Ready |
| Pin 21 | Unused |
| Pin 22 | Ring Indicator |
| Pin 23 | Unused |
| Pin 24 | Unused |
| Pin 25 | Unused |
| Pin 1 | Chassis Ground |
|---|---|
| Pin 2 | Transmitted Data |
| Pin 3 | Received Data |
| Pin 4 | Request To Send |
| Pin 5 | Clear To Send |
| Pin 6 | Data Set Ready |
| Pin 7 | Signal Ground |
| Pin 8 | Received Line Signal Detector |
| Pin 9 | Unused |
| Pin 10 | Unused |
| Pin 11 | Unused |
| Pin 12 | Unused |
| Pin 13 | Unused |
| Pin 14 | Unused |
| Pin 15 | Unused |
| Pin 16 | Unused |
| Pin 17 | Unused |
| Pin 18 | Unused |
| Pin 19 | Unused |
| Pin 20 | Data Terminal Ready |
| Pin 21 | Signal Quality Detector |
| Pin 22 | Ring Indicator |
| Pin 23 | Data Signal Rate Selector |
| Pin 24 | Transmit Signal Element Timing |
| Pin 25 | Unused |
| Pin 1 | Carrier Detect |
|---|---|
| Pin 2 | Receive Data |
| Pin 3 | Transmit Data |
| Pin 4 | Data Terminal Ready |
| Pin 5 | Signal Ground |
| Pin 6 | Data Set Ready |
| Pin 7 | Request To Send |
| Pin 8 | Clear To Send |
| Pin 9 | Ring Indicator |