How do I get a grand total for just a department from a Royal 210dx cash register.

Try cleaning the head with an alcohol swab. It is a thermal printer. It may have paper dust or debris. Parts from Royal in the link.

https://www.google.com/search?q=new+print+head+for+royal+210

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IR40

It means you are not logged on. Look for the clerk button and log in

It may be the same as the 110DX, but I couldn't find the manual for the 210DX . This is from page 37 of the 110DX manual. TO CLEAR THE GRAND TOTAL:
1. Set the Control Switch to the "PRG" (Program Mode) position.
2. Type [2], type [0], then press [R/A].
After this operation, the grand total resets to zero.

I HAVE BOUGHT A USED ER5200M. I HAVE CLEARD THE PLU'S AND RE PROGRAMMD WITH MY ITEM & PRICE INTO THE PLU'S. EACH NIGHT AFTER I DO "Z" REPORT, THE REGISTER IS STILL TOTALING MY GRAND TOTAL ONTO THE OTHER OWNERS GRAND TOTAL WITH MINE, HOW DO I CLEAR GRAND TOTAL SO IT WILL BE ONLY MY GRAND TOTAL ?

how do I reset the GT on my Royal 210dx cash register?

Not sure what you mean by new and old grand total. There is normally one grand total and that should print by default. It is affected by everything you do. It can't usually be edited or reset as it is there to stop fraud. Most people do not use it. You only need the daily totals that get reset after a Z report

I would like some instructions how to operate my Royal 482 NX Register.

"Z" (Prints End-of-Day Management Reports and Resets Totals) - Prints the "Z" management report at the end-of-the-day and resets totals to zero (except "locked-in" grand total).
To print Management Reports, slide the control switch to the "X" or "Z" position as needed, then press the [amt tend/TOTAL] key. Refer to explanation starting on page 37.
"X" AND "Z" SALES MANAGEMENT REPORTS
__________________________________________________________________
Transaction data is maintained in the memory of the cash register as long as the battery back-up system is in effect. This data can be printed as a report for management review.
The Management Report can be printed from either the "X" or the "Z" position on the Control Switch.
"X" POSITION REPORT (Refers to a mid-day reading)
The "X" position report prints the accumulated information and RETAINS ALL TOTALS IN MEMORY. Use this position to print periodic readings of transaction information at any time through-out the day. (Some users call the X-report a mid-day report).
"Z" POSITION REPORT (Refers to an end-of-day or close-out reading)
The "Z" position report prints the same information as the "X" report. However, once this report is printed, ALL TRANSACTION TOTALS ARE RESET TO ZERO except the Grand Total. (Some users call the Z-report an end-of-day report).
NOTE: To prevent accidental printing of the "Z" report, set the security code as explained in the SECURITY CODE section.
Once this code is set, a "Z" report will not print until the security code is entered. If a "Z" report is attempted without entering the security code, the prompt "SEC Code" will appear in the display.


PRINTING THE SALES REPORT
IMPORTANT: Once a "Z" reading is taken, it cannot be duplicated, so be sure to have plenty of paper in the register.
1. Set the Control Switch to either the "X" or "Z" position.
2. Press the [amt tend/TOTAL] key.
NOTE: If a security code has been assigned, be sure to enter the security code before pressing the [amt tend/TOTAL]
key.
TO CLEAR THE GRAND TOTAL:
1. Set the Control Switch to the "prg" (Program Mode) position.
2. Type [2], type [0], then press [RA].
After this operation, the grand total resets to zero.

Hi. On most machines, the Grand total is non resettable and is just ignored if you don't want to track the total sales of the machine long-term. It should not affect the daily totals. The rest of the report should reset at the end of the day. If you don't see CASH totals and departments etc returning to zero, then there is another problem. If you still want to try to stop the GT on the reports, tell me the brand and model number and I'll see if it can be forced from the report.

Mark