... protectionRS232/RS485/RS422 port: 15KV ESD protectionSIM/UIM port: 15KV ESD protectionPower port: reverse-voltage and overvoltage protectionAntenna port: lightning protection( ... ConvenienceSupport standard RS232(or RS485/RS422) and Ethernet port that can connect to Ethernet and serial devices directlySupport ... protocols, such as TCP/IP, UDP, ICMP, SMTP, HTTP, POP3, OICQ, TELNET, FTP, SNMP, etc.