USRIOT USR-N520, Руководство пользователя

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Contents
1. Quick Start ....................................................................................................................................................................... 4
1.1. Hardware Testing Environment ........................................................................................................................ 4
1.2. Network Test Environment ................................................................................................................................ 4
1.3. Default Parameter ............................................................................................................................................ 5
1.4. Data Transmission Test ..................................................................................................................................... 5
2. Overview .......................................................................................................................................................................... 7
2.1. Brief Introduction ................................................................................................................................................. 7
2.2. Features ............................................................................................................................................................... 7
2.3. Basic Parameter ................................................................................................................................................. 8
2.4. Dimension ............................................................................................................................................................ 8
2.5. Indicators and Dial switch ................................................................................................................................. 9
2.6. DB9 Pin Definition ............................................................................................................................................ 11
3. Product Function .......................................................................................................................................................... 12
3.1. Socket A Communication ................................................................................................................................ 12
3.1.1. TCP Client Model .................................................................................................................................. 12
4.1.1 TCP Client Mode .................................................................................................................................... 12
3.1.2. TCP Server Mode ................................................................................................................................. 15
3.1.3. UDP Client Mode .................................................................................................................................. 16
3.1.4. UDP Server Mode ................................................................................................................................. 18
3.1.5. TCP and UDP Comparison ................................................................................................................. 19
3.1.6. HTTPD Client ......................................................................................................................................... 19
3.2. Socket B Communication ................................................................................................................................ 21
3.3. USR-VCOM Application .................................................................................................................................. 23
3.4. Modbus Gateway .............................................................................................................................................. 24
3.4.1. Transmit modbus protocol in transparent mode .............................................................................. 24
3.4.2. Modbus RTU to Modbus TCP ............................................................................................................. 24
3.4.3. Modbus Active Query Function ........................................................................................................... 26
3.4.4. Modbus Polling Function ..................................................................................................................... 29
3.5. Value-added Functions .................................................................................................................................... 32
3.5.1. DHCP ...................................................................................................................................................... 32
3.5.2. DNS ......................................................................................................................................................... 32
3.5.3. Self-Defined Heartbeat Function ........................................................................................................ 32
3.5.4. Self-Defined Registration Package Function ................................................................................... 34
3.5.5. Web to serial .......................................................................................................................................... 36
3.5.6. Customized Webpage .......................................................................................................................... 39
3.5.7. Network Printing Function ................................................................................................................... 39
3.5.8. Serial Port Packaging Mechanism ..................................................................................................... 41
3.5.9. Flow Calculation .................................................................................................................................... 42
3.5.10. Synchronous baud rate (RFC2217) ................................................................................................ 42
3.5.11. KeepAlive ............................................................................................................................................. 44
3.5.12. Device ID .............................................................................................................................................. 44