modbus over TCP

https://maker.wiznet.io/2017/07/10/simple-plc-network-controller-wisioe/

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Tools

nmap --script modbus-discover.nse --script-args='modbus-discover.aggressive=true' -p 502 https://nmap.org/nsedoc/scripts/modbus-discover.html Wireshark: https://osqa-ask.wireshark.org/questions/50063/getting-register-values-from-modbustcp-response/


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References

https://theautomization.com/what-is-modbus-tcp-ip/

https://modbus.org/docs/Modbus_Messaging_Implementation_Guide_V1_0b.pdf

https://cdn.sparkfun.com/datasheets/Dev/Arduino/Shields/W5500_datasheet_v1.0.2_1.pdf

https://cars9.uchicago.edu/software/epics/modbusDoc.html#medm_screens

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Code Examples

https://github.com/Surfride10/w5500/blob/master/w5500.ino

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20210812 - pre published v0.9