NImesh Sharma Posted October 26, 2017 Report Share Posted October 26, 2017 I have trying to design communication interface with LG-New Master K Series 300S plc. I have also refer Master-K series document. But i can't found any proper documents for communication. How to read register from PLC? How to write register in PLC? please suggest me any documents or query format for same. I got query from HMI which is already connected with PLC. {STX}rM125D00025D{ETX} This type of query format not explain in any documents. please help me. Quote Link to comment Share on other sites More sharing options...
MVP 2022 Joe Tauser Posted October 27, 2017 MVP 2022 Report Share Posted October 27, 2017 I looked at the brochure for the Master K 300S and I didn't see Modbus listed as a supported protocol anywhere. Unitronics usually uses Modbus to communicate with other devices. Do you have a link to what documentation you have? Joe T. Quote Link to comment Share on other sites More sharing options...
NImesh Sharma Posted October 27, 2017 Author Report Share Posted October 27, 2017 hello sir Yes i have one document regarding to software base read and write query for LG master k 300s series plc. But these document is not useful for me. Thanks for your support. Nimesh Sharma pmu_comm_interface.pdf Quote Link to comment Share on other sites More sharing options...
MVP 2022 Joe Tauser Posted October 28, 2017 MVP 2022 Report Share Posted October 28, 2017 This appears to be a manual for an LG touchscreen. You are correct - there's no details on the protocol. But they do mention something on page 22 about the "CPU Direct" connection, which tells me a proprietary LG protocol exists. Tell us about your hardware - do you have an LG Master PLC and you're trying to come up with an HMI for it? Or are you trying to decipher how it talks? I found this sales information on the Master-K: http://www.westshorecontrols.com/wp/wp-content/uploads/2015/08/master-K-catalogue.pdf I'm not sure what we can do to help here. Joe T. Quote Link to comment Share on other sites More sharing options...
NImesh Sharma Posted October 28, 2017 Author Report Share Posted October 28, 2017 hello sir, Finally we solve our 80% problem by peakHMI software. we connect peakHMI with lg plc for read data but we have one more problem we require 7c as a BCC. I attach one image file can you send bcc calculation in your terms in programing language(we required BCC in programing language). please little more help. Thanks for your support. NImesh Sharma Quote Link to comment Share on other sites More sharing options...
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