描述： Measuring less then 3 inches high, they're ideal for tight spaces. Plug right into your machine's DB9 serial port, so you still have room for other connections. Runs up to 115.2 kbps as far as 1.4 miles (2.2 km). 规格： Supports distances up to 5 miles (8 km) at 1200 bps. Operates half- or full-duplex, async, multipoint or point-to-point over two or four wires. Built-in surge protection—up to 600 watts per wire! Handles up to 50 multipoint drops.
