Keep getting an unknown printer error and my cash drawer will not open. Any suggestions?
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I have the same question (0)Are you using a windows printer or an OPOS printer. sounds like an opos printer to me. If opos open the configuration/test tool provided with the driver and test pop the drawer. If it pops then repair install RMS through the control panel -> Programs and Features / Add Remove Programs.
If it doesnt pop then your problem lies with the driver. Update your opos driver or uninstall and reinstall.