CableCreation CD0486 USB to Female RS-232 Adapter
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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.
| Pin No | Direction | Function |
|---|---|---|
| 1 | PC ← device | DCD |
| 2 | PC → device | TXD |
| 3 | PC ← device | RXD |
| 4 | PC → device | DTR |
| 5 | PC ↔ device | GND |
| 6 | PC ← device | DSR |
| 7 | PC → device | RTS |
| 8 | PC ← device | CTS |
| 9 | PC ← device | RI |
For more pin function information, see these Wikipedia pages:
Serial port - Wikipedia (Pinouts section)