TMN-51T Hardware User Guide 3Key FeaturesPlug and Play • Full Transparent Data Transmission• Protocol independentRich Options • UDP for fast and bulk data transfer• TCP for reliable data transfer• App control protocol for secure data transferRobust Operation • Self test• Self reset and recovery• Data buffering• Support auxiliary data centerEasy Control • Remote configuration by SMS or GPRS• Remote activation by SMS or Data CallAlways ON Connection • Heart beat feature for socket connection• Time to live timer for network checkingFlexible Operation • 3 methods of serial data packetization• Server mode and client mode for connection• Static or dynamic IP• Support RS232 / 485 hardware interfaceRTOS RTC IAP UART0 UART1AM EM NV DebugControlGPRSModem APP SMS APPOther ProtocolXmodemIPUDPTCPService LayerApplication LayerKernel LayerGPRS APP Control APP Call APPMain APPFirmware Block DiagramHardware Block Diagram