PC Serial Port (25 pin)
(Diagram shows D25 male as on computer)
Pin number |
Description |
| 1 | Protective ground |
| 2 | TX (transmit data) |
| 3 | RX (receive data) |
| 4 | RTS (request to send) |
| 5 | CTS (clear to send) |
| 6 | DSR (data set ready) |
| 7 | SG (signal ground) |
| 8 | CD (carrier detect) |
| 9-19 | not used |
| 20 | DTR (data terminal ready) |
| 21 | not used |
| 22 | RI (ring indicate) |
| 23-25 | not used |
