How Many Pins Are Used In a Serial Port?
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A serial port typically uses nine pins:
1. Transmitted Data (TXD)
2. Receive Data (RXD)
3. Data Terminal Ready (DTR)
4. Signal Ground (SG)
5. Data Set Ready (DSR)
6. Request To Send (RTS)
7. Clear To Send (CTS)
8. Ring Indicator (RI)
9. Carrier Detect (CD)