Good Morning Everyone, This topic is about using the SERIAL Port Input/output DLM that is available for download. As, some of you already notice it, this plug-in is not anymore working for the last verion of IDL. In the post "Serial" by shenanigans, ITT support answer that "...The dll and dlm will need to be set up to work with the IDL release.  The author included the C source file so a new dll and dlm should be able to be compiled for use with IDL 71." Probably, compiling dll and dlm seems easy. But I have to say that I really don't know how to do this, I it's seems that I'm not the only one... So, I know that my request is beyond the scope of this forum, but I would be very greatful to ITT support if it could kindly help all IDL users in the "easy" task of recompiling this C code to make it works with IDL last version. Thanks in advance for your help. Best regards. Antoine C.