Computer based cash register configurations

Simple POS system consists of computer unit, operator display, keyboard, pointing device, barcode reader, customer display, slip printer and if required by country law - fiscal memory block. According to some specific requirements fiscal block might be located in printer or in CPU block.


Fiscal memory block 

During day all sales counters are stored in memory. After end of day procedure - Z report is taken and all daily sales are stored to non-changeable memory area, where all information is protected against counter change. 

During each sales transaction POS sends information about VAT totals of current slip to fiscal memory block. According to law restriction level fiscal device might be of several types:

Fiscal block - smart memory

In this case computer communicates uses fiscal memory block like non ressetable memory using simple command system. Slip printer and customer display is controlled by POS software. In countries where this system is allowed more responsibility regarding sensitive TAX information calculation is provided for POS software. Usually in this case POS software should go throug TAX authority approval. Sometimes it might be inconvenient because each new software version should go approval procedure.

Main procedures

Daily routines. 

Add sale amount to VAT category A  (B,C,..)

End of day. 

Place daily totals to nonresetable memory area.


Store TAX payers credentials


Fiscal block controls peripherals

In this case fiscal block fully controls slip printer and if needed costumer display. 

Main procedures

Daily routines. 

Sales, refund, cashier login, add float, paid out 


Z-report -end of day routine.

X- report

Periodic reports


Change slip header, footer, VAT's, owner information and many more.

Sensitive NRGT information

Daily counters

End of days

Electronic journal

Closer look

Electronic control journal 

One of key features to control was printed receipt is legal is ability to have transaction journal. For this reason in some countries two station printers are still used. Two station printers are usually bigger and cost more than single station model. Currently thermal printing is used widely. This type of printing has benefits - speed, better slip design, but also has disadvantage - thermal paper is washed out after quite short period of time. FM device - electronic control journal (ECJ) solves these problems. There is no need to print copies of all slips - they might be saved in electronic memory. TaxCounter contains internal memory space of 4Mb and optionnaly any available size of flash memory might be connected for this purposes.