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)

RS-232 - Wikipedia

Online Resources

CableCreation USB to RS232 Serial Adapter (FTDI Chip), 6.6 Feet USB to DB9 Female Converter Cable | Amazon