How does the UC-100 work?

Normally you would connect the cash drawer to the receipt printer. The way the electrical opening of a cash drawer works is that the receipt printer sends an electronic pulse when it’s printing a receipt - this opens the cash drawer. 
The UC-100 basically replaces the receipt printer.  In the POS software, instead of selecting a printer you need to point the software to the COM port where the UC-100 is connected to.  (check this in windows device manager, under Com & LPT ports). 
There is no specific protocol to open the cash drawer via the UC-100.  Any command given to the COM port will send a signal through the UC-100 to open the drawer.  For example a simple DOS command like  echo hello > COM4 is enough. 
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