Two ports with dual 10-pin connectors: Port 1: RS-232 or RS-422/RS-485 Port 2: RS-422/RS-485

16C550 UARTs with 16-byte FIFO

Speeds from 50 to 115 Kbps

Distances up to 4,000 ft/1.2 Km

500 VDC Isolation

Automatic RS-485 data flow control

Surge protection on TX/RX lines

Power requirement: +5V @ 400 mA (typical), +5V @ 950 mA (maximum