Only through a lot of trial and error if you do not have documentation. You can try some standard codes and see what is returned like (there are standard examples on this page for epson and star models):
http://www.apgcd.com/home/tech_support-faqs.phpOnce you can communicate with the drawer (by opening it) then you can search via google and try different codes and see if anything is returned via the oncomm of the mscomm control if it is connected via a serial port.
>How can I programatically check whether the cash drawer connected to COM Port is currently open or close. The cash drawer is of unknown brand and does not acompany
>any manual.
>
>Zaheer
.·*´¨)
.·`TCH
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