usb to male serial adapter

Most USB-to-serial adapters connect a USB Type-A host to a 9-pin DB9 serial connector and support common serial interfaces such as RS-232, RS-422 and RS-485.

Many adapters include COM retention: the driver remembers and automatically reassigns the same COM port number after reboots or when a cable is unplugged and replugged, helping keep port assignments stable for connected devices and software.

Most USB-to-serial adapters draw power from the USB host and do not require an external power supply. Check the product listing if you need an industrial model or higher power capabilities.

Supported baud rates vary by model—from around 230 Kbps up to about 921.6 Kbps in the listings. Serial settings commonly supported include parity modes (None, Odd, Even, Mark, Space), data bits (5, 6, 7, 8), and stop bits (1 or 2). FIFO buffer sizes also vary by device (examples from 128/256 bytes RX/TX to 512 bytes or up to 4 KB in some units).

Some adapters add a single DB9 RS-232 port, while others provide two DB9 RS-232 ports. Configuration options noted in listings include null‑modem (cross-wired) variants, COM retention for stable port assignments, secure DB9 mounting with screws or nuts, and transmit/receive LED indicators on some models.

Listings show broad OS support: various Windows versions (examples range from Windows 2000 up through Windows 11, with many models offering driver auto-install on Windows 7+), macOS versions (examples in the listings range from macOS 10.6 up to 12.4, with some noting auto-install for 10.15+), Linux (kernel-based driver support and references to Red Hat versions), and ChromeOS on some models. Always check the product’s driver notes to confirm support for your exact OS version.

Product details list rugged construction features such as double or copper shielding to reduce EMI/RFI, one‑piece molded TPE housings, Level‑4 ESD protection (15 kV air / 8 kV contact), gold‑plated connectors, and in some cases extended operating temperature ranges.