USR-N540 User Manual www.usriot.com
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 .............................................................................................................................6
2. Overview...........................................................................................................................................................7
2.1. Brief Introduction ....................................................................................................................................7
2.2. Features..................................................................................................................................................7
2.3. Basic Parameter.......................................................................................................................................8
2.4. Dimension...............................................................................................................................................9
2.5. Indicators and Dial switch .......................................................................................................................10
2.5.1. Indicator light ..............................................................................................................................10
2.5.2. Dial Switch ..................................................................................................................................10
2.6. DB9 Pin Definition..................................................................................................................................12
2.7. DB9 Pin-board .......................................................................................................................................12
3. Product Function .............................................................................................................................................13
3.1. Socket A Communication........................................................................................................................14
3.1.1. TCP Client Mode..........................................................................................................................14
3.1.2. TCP Server Mode .........................................................................................................................17
3.1.3. UDP Client Mode .........................................................................................................................18
3.1.4. UDP Server Mode ........................................................................................................................21
3.1.5. TCP and UDP Comparison.............................................................................................................24
3.1.6. HTTPD Client ...............................................................................................................................24
3.2. Socket B Communication........................................................................................................................26
3.3. Short Link..............................................................................................................................................28
3.4. USR-VCOM Application...........................................................................................................................28
3.5. Modbus Gateway...................................................................................................................................30
3.5.1. Transmit Modbus Protocol in Transparent Mode ............................................................................30
3.5.2. Modbus RTU to Modbus TCP ........................................................................................................30
3.5.3. Modbus Active Query Function.....................................................................................................31
3.5.4. Modbus Polling............................................................................................................................34
3.6. USR-Cloud Function ...............................................................................................................................39
3.7. Value-added Functions...........................................................................................................................40
3.7.1. DHCP..........................................................................................................................................40
3.7.2. DNS............................................................................................................................................40
3.7.3. Heartbeat Packet Function............................................................................................................40
3.7.4. Registration Package Packet Function ............................................................................................42
3.7.5. Web to serial...............................................................................................................................44
3.7.6. Customized Webpage...................................................................................................................46
3.7.7. Network Printing Function............................................................................................................47
3.7.8. Serial Port Packaging Mechanism ..................................................................................................49
