OPOS Devices

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Posted on by Community Member Microsoft Employee

We keep getting an error message as follows- "Invalid Operation 426: The OPOS device is not opened..." when we go to settle each transaction. The drawer does open but we have to X out of the message to print a receipt. It started when the drawer wouldn't open and the employees there at the time said that they just kept rebooting until the drawer opened. I looked into the register properties and tried changing some of those properties but I can't get rid of having to X out of the message each time we complete a transaction. Thanks for any advice!

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RMS Wizard 1,205 on at

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RE: OPOS Devices

You may need to reinstall the printer's OPOS driver or reinstall RMS or both.

If you have OPOS setup for the cash drawer make sure F8 No Sale works too since RMS first pops the drawer before printing a receipt.
Community Member Microsoft Employee on at

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RE: OPOS Devices

we need to know which printer (brand and model) you have and which cash drawer you have. Also how the drawer is hooked up, to the printer or directly to the station(pc) ?