If you're planning to develop for FP-550T Fiscal printer through the COM Server, don't download it from the website. Get it from Datecs' FTP Server: ftp.datecs.bg. The version on the website is obsolete and doesn't work correctly.
This may save you a support call.
AquilaX’s development blog
code and so on…
Datecs FP-550T
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http://CodingCat.com CodingCat