Feature: 1. The RS485 to GPRS serial server supports TCP with stable performance, with 850/900/1800/1900MHz cellular frequency band 2. The serial server supports remote firmware upgrade and remote configuration parameters 3. Support SMS AT function and support registration package, heartbeat package 4. Adopt serial AT command, IOT Service serial configuration software and IOT Service network configuration software configuration method 5. The server uses for RDA8955 processor, the main frequency is 256MHz and the operating system is for SRX Specification: Item Type: RS485 to GPRS Serial Server Core Parameters: Model Name: HF7311 Function Explanation: Serial port to GPRS Processor: For 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 type 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: 3socket SIM Card Interface: 1.8V/3V (external) Serial Port Interface Parameters: Number of Serial Ports: 1 Interface Standard: RS485 Baud Rate: 1200-460800bps Product Features: Configuration Method: Serial AT command, IOT Service serial configuration software, IOT Service 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: Input Voltage: 5-36VDC at 1A Interface Form: RJ45 interface Size: Approx. 61 x 18 x 26mm / 2.4 x 0.7 x 1in . Package List: 1 x Serial Server1 x GPRS Antenna1 x Crystal Head Turn Button+4pin Terminal Line1 x Fixed Bracket1 x Rail Bracket2 x Screw