It depends on the software, every time the sw sends the signal to
print a ticket, it is accompanied by an impulse the printer relays to
the drawer. Notice how when performing a self test the drawer
doesn't open? That's why. My POS sw has a selectable parameter
to send or not send the drawer open impulse. You would need to
mod your sw to have that selectability.
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Are you using the Epson TM-T90 driver? When you go to printer settings through Printers and Faxes there is an option to Open Drawer after or at the Beginning of the transaction.
One other way to check if you have the correct commands for it is by checking on printers Manual and Technical documents of it where you can get online. Click HERE. Register and wait for an Email for Username and password.
Hope this helps.
print the self-test, push the feed botton while powering on...
you can see there the serial interface...
baud rate, data bits, parity, stop bit etc...
then go to the printer and faxes,
right click the epson driver and click properties...
go to the ports window...
click on the epson tm u220 reciept.
click configure port...
adjust the baud rate as same as in the self test...
From the computer (application to be exact), you send a signal to the printer to kick the drawer open but is there a confirmation signal from the printer going back to the computer that it successfully opened the drawer (not just successfully carried-out the command) ?
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