● Four independent, completely configurable, serial ports

● Supports High-speed RS-422 (COM422-4) or Multi-drop RS-485 (COM485-4)

● Supports RS-485 handshaking on-board without special drivers to support Windows and non-DOS programs (COM485-4 only)

● Built-in support for local echo, line termination, and line bias supplies

● Supports extended AT interrupts

● Equipment monitoring

● Environmental measurements

● Embedded data acquisition

● Education/Laboratory

● Industrial Automation

Drivers for various operating systems are also provided, including active support for Windows XP -> 10 — all in both 32-bit and 64-bit flavors, and including consumer, server, and embedded varieties — as well as the 2.6 and newer Linux kernels and recent OSX / macOS versions. Many products continue to ship with driver support for Windows 95, 98, Me, NT4, and Windows 2000, but support for these operating systems is considered deprecated.