modbus pdu - JohnHau/mis GitHub Wiki

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https://github.com/node-modbus/pdu https://www.ni.com/en-us/innovations/white-papers/14/the-modbus-protocol-in-depth.html#:~:text=The%20Modbus%20PDU%20format%20is,exceed%20253%20bytes%20in%20size.

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http://www.adfweb.com/home/products/modbus_TCP_RTU.asp?language=ENG&loc_phy=2344&k001=b&CinaF1=%2Bmodbus&d=c&pos=&kxyW=&gclid=CjwKCAjw682TBhATEiwA9crl37IoU3AZQK4tBVlzQ1WyMFiHKy5auKp3_6lL0hpGIsmo-44MpJkj3hoCy7sQAvD_BwE

https://www.etherwan.com/support/ebulletin/connectivity-foundation-iot?gclid=CjwKCAjw682TBhATEiwA9crl35-q2dzp_pnBT95FU5QwTTJaLRpLZIo93hSkuCH9rbbRt5UnWn6F7RoCEVYQAvD_BwE

https://www.modbustools.com/modbus.html

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https://camatsystem.com/wp-content/uploads/2015/12/Modbus-manual-TD80.pdf

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https://libmodbus.org/