Aten Serial Hub 4 Port USB to RS232 Converter w/ 1.8m cable, Supports Hot-Swapping Plug and Play UC2324-AT

The ATEN USB-to-Serial RS-232 Hub provides an external plug-and-play RS-232 serial connection for computers, notebooks, laptops, and handheld computing devices that support the USB specification. It provides a quick, simple, and cost-effective solution and is ideal for various communication and automation applications.

Easy way to add 4 RS-232 serial ports
Fully compliant with USB 1.1; USB 2.0 compatible
Supports RS-232 serial interface
Supports automatic handshake mode
Up to 115.2 Kbps data transfer rate for each serial port
Dual data buffers for each upstream and downstream data transfer
No IRQ, DMA, I/O address resources required
Supports hot-swapping and plug-and-play
Built-in 16KV ESD protection
Supports both bus power and external power
Works with cellular phones, PDAs, digital cameras, modems and ISDN terminal adapters