Not support local data storage: ModbusMaster VPN function, APN function, DDNS function, WiFiSAP core resources: operating system: for Ecos FLASH resources: 4MB RAM: 8MB Ethernet interface parameters: Ethernet interface form: 1 RJ45, interface standard: 10/100Base-T Auto-Negotiation Network Port Protection : 8 kV. Contact discharge, 15. KV air discharge ----Network protocols: for IP, for TCP, for UDP, for DHCP, for DNS, for HTTP server/for Client, for ARP, for BOOTP.AutolPJCMP.Telnet.uPNP Security Protocol (Data Communication): for TLSV1.2, for AES-128Bit, DES3, for SSL ---Supported functions: support for Http protocol transmission mode, modbus conversion, NTP function + time zone setting, virtual data channel, registration package function, heartbeat package function, custom script function, package filtering, serial framing, WiFi routing mode, WiFi bridge mode WiFi Roaming Function, WiFi Switch, Hidden SSID, Chinese SSID Parameters, Import and Export, Support for ModbusRTU for ModbusTCP ----Item type: HF-2211 serial port server model: HF-2211 input voltage: wide voltage 5~36V DC size: approx. 95 x 65 x 25 mm / 3.7 x 2.6 x 1 inch working temperature: -45 - 85 interface shape: φ5.5 x 2.1 mm socket and 5.08 mm terminal block, working current: 200 mA power consumption: < 700 mW