text: <s>[INST] Communicate Power monitor 3000 with MODBUS RTU Summary: As PM3000 Manual claimed that it supports MODBUS protocol, but i got exception code 2 when reading the registers according to Data table. As PM3000 Manual claimed that it supports MODBUS protocol, but i got exception code 2 when reading the registers according to Data table. Are there some body who has communicated wth PM3000 via Modbus successful? Any hints are highly appreciated . Many Thanks! Min [/INST] Welcome to the Forum ! I suggest to post details about communication settings you're using for your tests... also add some infos about wiring and connected device. Details of items you're trying to read could also be useful for Forum's users in trying to help. - fuzzy logic In order to enhance the reputation of the Forum's contributors, please rate the replies you got and remember to close the thread clicking Choose as Best Answer button over the solving answer. Thanks ! \\n </s>