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Dear Luca, Thank you for choosing our products. Regarding your inquiry, please follow this link: https://www.eztcp.com/en/support/qna_view.php?bbs_id=3&page=1&cid=1582 Thank you very much. Best Regards, > Luca wrote: > ------------------------------------ > Hello, > > I have the following problem with a CSE-M73 card: > > Currently I use a CSE-M73 with firmware 1.5D (year 2011) connected to a device via serial RS232 and it works very well. > In April 2018 I bought a CSE-M73 with firmware 2.0A and configuring it in the same way the reading / writing of data on the serial returns error. > > I tried to loop back test with the Ez-Manager application and it works correctly. > > Could it be a firmware incompatibility? Is it possible to downgrade to 1.5D? > > Thank you > Best regards > Luca
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