# Serial (PC 9)

Also known as EIA/TIA 574

(at the Computer)

9 PIN D-SUB MALE at the Computer.

Pin | Name | RS232 | V.24 | Dir | Description
--- | --- | --- | --- | --- | ---
1 | CD | CF | 109 |  | Carrier Detect
2 | RXD | BB | 104 |  | Receive Data
3 | TXD | BA | 103 |  | Transmit Data
4 | DTR | CD | 108.2 |  | Data Terminal Ready
5 | GND | AB | 102 |  | System Ground
6 | DSR | CC | 107 |  | Data Set Ready
7 | RTS | CA | 105 |  | Request to Send
8 | CTS | CB | 106 |  | Clear to Send
9 | RI | CE | 125 |  | Ring Indicator

Note: Direction is DTE (Computer) relative DCE (Modem).
Note: RS232 column is RS232 circuit name.
Note: V.24 column is ITU-TSS V.24 circuit name.

Contributor: Joakim Ögren

Source:
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May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2000-07-09