The EZsync2127 is a high quality industrial-grade high speed bi-directional 8 wire (TX, RX, CTS, RTS, DSR, DTR, RI & GND) opto-isolated externally powered RS232 2500V isolator with 15KV ESD and 600W surge protection in a 9 pin format. Since it is externally powered, port-powered incompatibility problems are not an issue. The optically isolated circuitry provides effective protection for your devices from voltage surges, ground loop conditions, and noise problems. The adapter kit includes two serial cables and a power supply. Operates reliably from 300 to 115.2K bps.