CableCreation CD0486 USB to Female RS-232 Adapter
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Overview
USB to RS-232 with female DE9 plug (male jackscrews) and a mostly 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 mostly configured as a DCE not a DTE, it is expecting to communicate with a DTE. Mostly because pins 1 and 9 have the wrong direction, they are not outputs, whether or not they are actually inputs needs to be verified...
| DE9 Pin | Function | Direction | Note |
|---|---|---|---|
| 1 | DCD | PC ← device | supposed to be an output for DCE? |
| 2 | RXD | PC → device | |
| 3 | TXD | 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 | supposed to be an output for DCE? |
| (shield) | shield | PC ↔ device |
For more pin function information, see these Wikipedia pages:
Serial port - Wikipedia (Pinouts section)