Supports 4 Male DB9 Serial Port Over Ethernet 1 RJ45 10/100 Mbps Ethernet Port Network Protocols: TCP Server/Client, UDP, VCOM, Serial Telnet, RFC2217, RemotePair (Master-Slave), Modbus Server/Client Supports 15 KV ESD Protection for all Serial Signals Rugged Metal Case w/ DIN-Rail and Wall-Mount Kit