CableCreation CD0486 USB to Female RS-232 Adapter
Overview
USB to RS-232 with female DE9 plug (male jackscrews) amd a DCE pinout, not normally found on a PC that would typically have a male DE9 DTE pinout. When DCE is needed though, this adapter would make a null modem (crossover) cable unnecessary. If needed a DTE pinout though, you would have to go back to using a null model cable...
Wiring
This USB to RS-232 is configured as a DCE not a DTE, it is expecting to communicate with a DTE.
| DE9 Pin | Function | Direction |
|---|---|---|
| 1 | DCD | PC ← device |
| 2 | TXD | PC → device |
| 3 | RXD | PC ← device |
| 4 | DTR | PC → device |
| 5 | GND | PC ↔ device |
| 6 | DSR | PC ← device |
| 7 | RTS | PC → device |
| 8 | CTS | PC ← device |
| 9 | RI | PC ← device |
| (shield) | shield | PC ↔ device |
For more pin function information, see these Wikipedia pages:
Serial port - Wikipedia (Pinouts section)