Item Type: RS232 to GPRS Serial Port Server Model Name: HF7311 Function Explanation: Serial port to GPRS Processor: RDA8955 Frequency: 256MHz Operating System: SRX FLASH Resources: 4MB RAM: 4MB Network Interface Parameters: Cellular Standard: GSM / GPRS Antenna Form: External SMA inner pin Cellular Band: 850/900/1800 / 1900MHz Cellular Communication Network Protocols: TCP, UDP, DNS Cellular Transmit Power: GSM850 / GSM900: Class 4 (2W) DCS1800 / PCS1900: Class 1 (1W) GPRS Rate: 107Kbps down, 85.6Kbps up Maximum Number Of Connections: 3socket SIM Card Interface: 1.8V / 3V (external) Serial Interface Parameters: Number Of Serial Ports: 1 Interface Standard: RS232 Baud Rate: 1200-460800bps Configuration Mode: Serial AT command, IOTService serial configuration software, IOTService network configuration software WEB Page: Not supported IP Acquisition Method: DHCP Virtual Data Channel: Support Firmware Upgrade: Serial or OTA upgrade Registration Package Function: Support Heartbeat Packet Function: Support Custom Script Function: Not supported Packet Filtering: Not supported Serial Framing: Not supported ModbusRTU for Modbus 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 ° C, 5-95% RH (non-condensing) Power Parameters: Input Voltage: 9-18VDC @ 1A Interface Form: RJ45 interface 1、RS232 to GPRS Serial Server TCP 2G GSM DTU Wireless Communication Transparent Transmission. 2、Support custom registration package and heartbeat package. 3、Support SMS configuration parameters, restart. 4、Support for Ali IOT, MQTT. 5、Can configure parameters remotely. 6、Configuration mode: serial AT command, IOTService serial configuration software, IOTService network configuration software. 1 x Serial Server 1 x GPRS Antenna 1 x Crystal Head Turn Button + 4PIN Terminal Network Cable 1 x Fixed Bracket 1 x Rail Bracket 2 x Screw