54EAdvanced OperationsThis chapter describes more sophisticated operations that you can use to suit the needs of your retailenvironment.Stock checkEach PLU has an actual stock totalizer that you can program with a minimum stock quantity. Then the registerchecks actual stock quantities against the programmed minimum stock quantities. Stock operations areperformed only for PLUs programmed with minimum stock quantities.Stock warningsThe cash register checks for negative values in actual stock quantities during the registration itself. Afterregistration is complete, it checks actual stock quantities against minimum stock quantities. The followingwarning indicators are used to inform the operator of any problem.• Negative stock:This indicates that the actual stock quantity is negative. You can also program the cash register to treat thiscondition as an error. This warning does not appear when the actual stock quantity is zero.• Under minimum stock:This indicates that the actual stock quantity is less than or equal to the minimum stock quantity. The cashregister can be programmed so that a buzzer sounds when the actual stock quantity is less than the minimumstock quantity.Notes• The stock check operation is also performed for PLUs programmed with minimum stock quantities that makeup set menus.• None of the warning indicators appear unless the cash register is specifically programmed for the stock checkoperation.• Stock operations can be performed for registrations in the RF mode or those performed with (therefund key).• An error correct, void, or cancel operation restores the original of items in stock value.Clerk interrupt functionThere are two types of clerk interrupt function, illustrated by PROCEDURE 1 and PROCEDURE 2 below.• In PROCEDURE 1, each clerk possesses a unique clerk interrupt buffer, and so the clerk interrupt functiongives each individual clerk the ability to perform an independent registration operation. In this case, each clerkis individually linked to a unique clerk interrupt buffer.• In PROCEDURE 2, multiple clerks use the same clerk interrupt buffer, and so a single clerk interruptoperation (clerk change during registration) can be performed any registration is in progress. In this case,multiple clerks are linked to a single clerk interrupt buffer.Note the following important points concerning the clerk interrupt function.• The register must be programmed to allow use of the clerk interrupt function.• To use the clerk interrupt function, a clerk interrupt buffer must first be allocated with the memory allocationoperation. Next the manager control operation (X1 mode) should be used to perform clerk assignment for theclerk interrupt function. The clerk interrupt operation cannot be performed by clerks who are not linked to aclerk interrupt buffer.• You cannot use the clerk interrupt function on a register set up to function as part of a check tracking system.In the REG1, REG2, and RF modes, clerks can be change while a transaction is in progress, making it possiblefor multiple clerks to simultaneously perform registrations using a single register.For example, if clerk 1 is interrupted while registering a transaction, clerk 2 can use the same machine toregister a different transaction. Then clerk 1 can continue the original registration from the point where it wasinterrupted.