| VT420 (25-pin) |
USB Serial (9-pin) |
| 2 – Transmit Data | 3 – Receive Data |
| 3 – Receive Data | 2 – Transmit Data |
| 7 – Ground | 5 – Ground |
| 6 – Clear to Send | 7 – Ready to Send |
| 20 – Data Terminal Ready | 4 – Data Carrier Detect |
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| VT420 (25-pin) |
USB Serial (9-pin) |
| 2 – Transmit Data | 3 – Receive Data |
| 3 – Receive Data | 2 – Transmit Data |
| 7 – Ground | 5 – Ground |
| 6 – Clear to Send | 7 – Ready to Send |
| 20 – Data Terminal Ready | 4 – Data Carrier Detect |
