With an operating temperature range of 0°C-70°C, two embedded USB-to-serial adapters from Sealevel Systems are software configurable for RS-232, RS-422, or RS-485. All configuration and electrical interface selections are handled through the driver software. The serial ports on each SeaLINK adapter appear as standard COM ports to the host computer, enabling compatibility with legacy software. With one-port and two-port variations, the adapters support data rates to 921.6 K bps. From $179.