root_bus

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  • in reply to: M-Bus #14294
    root_bus
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    I am working with the implementation of mbus protocol in energy meters. I have finished implementing it. I am using mikroe mbus master click board as master transciever and onsemi NCN5150 as my mbus slave transciever. I am facing an issue with obtaining the correct response as long frame telegram. Some of the bytes of my long telegram randomly changes after it is transmitted from mikroe master card. I am using an open source mbus master software by DECODE and using a PRCAB i extend my rx, tx signals to PC. When i am connecting my PRCAB with the rx, tx pins of my slave, everything is working alright on mbus master software as well as Docklight. But when i am taking my rx, tx signals via MIKROE mbus master card, randomly some bytes lose their original values on both the softwares.

    I tried checking the hardware side, the rx, tx pins are connected ok; the baud rate, parity and stop bits is also set correctly. i also tried varying the time it takes (after recieving its full query) to start sending the response. i checked it for 33 bit period for all baud rates and other values are 11, 22, 44, 55, 66, 77, 330 bit periods. (After a query is recieved the slave will wait for some time delay after that it will start sending response. I checked it with 11, 22, 33, 44, 55, 66, 77, 330 bit period for all baud rates)

    Still my problem remains unresolved. Help me out here.

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