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Dear Luca, Thank you for choosing our products. We would like to answer regarding your inquiry. In general, the serial communication error is unlikely caused by a firmware incompatibility. Since you can perform loopback test successfully, it seems that there is no problem with the CSE-M73 device. Please make sure there is no problem with physical cable and serial parameters. Besides the serial communication, the data transmission issue may be in TCP/IP connection (IP conflict, firewall, etc.). Could you please check this list to verify your configuration: https://www.eztcp.com/en/support/view.php?page=1&cid=286 In case there is no problem with the configuration, could you please give us more detail about your application and how exactly does the issue happen? From firmware 2014-12-29[1.7A] we change new CPU version, therefore downgrading firmware makes devices not work. We recommend that users keep using the latest firmware for the best performance. Please feel free to contact us if you have any inquiry. 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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