VT420 to Raspberry Pi (USB Serial)

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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