USC520 / USC540 User Manual www.usconverters.com
U.S. Converters LLC 2 / 52 Copyrights © U.S. Converters
Contents
2. Overview ......................................................................................................................................................... 4
2.1. Brief Introduction .................................................................................................................................. 5
2.2. Features ............................................................................................................................................... 5
2.3. Basic Parameter ................................................................................................................................... 6
2.4. Dimension ............................................................................................................................................ 6
2.5. Indicators and DIP switches ................................................................................................................. 7
2.6. DB9 Pin Definition ................................................................................................................................ 9
3. Product Function .......................................................................................................................................... 10
3.1. Socket A Communication ................................................................................................................... 11
3.1.1. TCP Client Model ..................................................................................................................... 11
4.1.1 TCP Client Mode ....................................................................................................................... 11
3.1.2. TCP Server Mode .................................................................................................................... 12
3.1.3. UDP Client Mode ..................................................................................................................... 12
3.1.4. UDP Server Mode .................................................................................................................... 12
3.1.5. TCP and UDP Comparison...................................................................................................... 13
3.1.6. HTTPD Client ........................................................................................................................... 13
3.2. Socket B Communication ................................................................................................................... 14
3.4. Modbus Gateway ............................................................................................................................... 16
3.4.1. Transmit modbus protocol in transparent mode ...................................................................... 16
3.4.2. Modbus RTU to Modbus TCP.................................................................................................. 17
3.4.3. Modbus Active Query Function................................................................................................ 18
3.4.4. Modbus Polling Function ......................................................................................................... 20
3.5. Extra functions ................................................................................................................................... 23
3.5.1. DHCP ....................................................................................................................................... 23
3.5.2. DNS ......................................................................................................................................... 23
3.5.3. Self-Defined Heartbeat Function ............................................................................................. 24
3.5.4. Self-Defined Registration Package Function .......................................................................... 25
3.5.5. Web to serial ............................................................................................................................ 27
3.5.7. Network Printing Function ....................................................................................................... 28
3.5.8. Serial Port Packaging Mechanism .......................................................................................... 30
3.5.9. Flow Calculation ...................................................................................................................... 30
3.5.10. Synchronous baud rate (RFC2217) ...................................................................................... 31
3.5.11. KeepAlive ............................................................................................................................... 32
3.5.12. Device ID ............................................................................................................................... 32
3.5.13. Webpage Port ........................................................................................................................ 32
3.5.14. Revise MAC ........................................................................................................................... 32
3.5.15. Firmware Upgrade ................................................................................................................. 33
3.5.16. Hardware Flow Control RTS/CTS & XON/XoFF ................................................................... 33
