RS232 to GPRS Server Serial Port TCP 2G GSM DTU Wireless Communication Transmission 5‑36V Item Type: RS232 to GPRS Server Core Parameters: Model Name: HF7311 Function Explanation: Serial port to GPRS Processor: RDA8955 Main Frequency: 256MHz Operating System: For SRX FLASH Resources: 4MB RAM: 4MB Network Interface Parameters: Cellular Standard: GSM/GPRS Antenna Form: External SMA male Cellular Frequency Band: 850/900/1800/1900MHz Cellular Communication Network Protocol: TCP, UDP, DNS Cellular Transmit Power: GSM850/GSM900: Class 4 (2W) DCS1800/PCS1900: Class 1 (1W) GPRS Rate: Downlink 107Kbps, uplink 85.6Kbps Maximum Number of Connections: 3 socket SIM Card Interface: 1.8V/3V (external) Serial Port Interface Parameters: Number of Serial Ports: 1 Interface Standard: RS232 Baud Rate: 1200-460800bps Product Features: Configuration Method: Serial AT command, for IOTService serial configuration software, for IOTService network configuration software WEB Page: Not supported IP Acquisition Method: DHCP Virtual Data Channel: Support Firmware Upgrade: Serial port or OTA upgrade Registration Package Function: Support Heartbeat Package Function: Support Custom Script Function: Not supported Packet Filtering: Not supported Serial Port Automatic Framing: Not supported RTU to TCP: Support NTP Function + Time Zone Setting: Support Parameter Import and Export: Support Reload Reset Interface: Yes Environmental Parameters: Working Temperature: -25-75℃ Storage Environment: -50-90℃, 5-95%RH (non-condensing water) Power Parameters: Interface Form: RJ45 interfaceSize: Approx. 61 x 26 x 18mm / 2.4 x 1 x 0.7in