I have casio SES-400 Model, I have got the serial port scanner & I have attached the same into it, I followed the same as below: 3 subtotal 0298 subtotal 2020 Ca/Amt Tend.

tax setting for pcr t290 Google Search

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

You can add a Hand held Scannerbar with your Casio Tk -7000
Hand held bar code scanner(HHS-15) *

Essential functions for the scanning environment such as Not Found PLU(NFP),PLU batch maintenance file,bottle link and Mix & Match functions are available on the TK-7000 model.

You can attach a Voyager Scanner with your TK-7000 model.

How to add in Casio Cash Register:
1. connection to cash register - unscrew and screw back in.
2. connection to scanner, unplug using paper clip into hole and push back in again.
3. rescan default sheet given whe nyou purchased the machine.
4. clean head of scanner.
5. check for cracks on scanner, ie. loss of vacuum.

For MOre Information visit the following sites:
1. Multisoft India
2. Cash Register
3. Bar Code Basic
4. Scanner Model
5. Casio 7000

Regards
Ellin

http://support.casio.com/en/manual/manualfile.php?cid=014003008

program mode, press number 3 key then press subtotal , press numbers 0125 press subtotal, press 3.00 press cash tender key, 5002 cash subtotal
example 3.%

OK try this..... Enter 3 press Subtotal enter 0225 press Subtotal enter tax (ex 7 1/4% = 7 decimal point 25) press CA/AmtTend enter 5002 CA/AmtTend press Subtotal
That should do it?

http://www.casio.com/support/content/D799D5A7-9C01-40E0-8D11-071A11F4A9A9#18
Above is the support link...

1. Turn key to program and press 2 subtotal
2. press 132 subtotal. then up to 21 letters for each line. 4 lines max
3. press cash at end of each line subtotal when done.

letters are entered as 4 digit code number followed by a decimal.
a=0110
b=0111

Hi. This is normal. Unless you made a backup, you will have lost a lot of system programming. Firstly you must make sure you have initialised it with the code for scanning and not check tracking. To do this:
Turn key to program mode 5 SUBTOTAL SUBTOTAL
This will print the memory allocation. Next to file 16, you should see a figure in the thousands (usually 6000).
Next you need to allocate the I/O port for the scanner. Try this:
Turn key to program mode 3 SUBTOTAL 298 SUBTOTAL 2000 CASH SUBTOTAL
Now perform a flag clear to set the new I/O:
Turn key to PROGRAM mode. Turn power off at wall. Hold RECEIPT FEED down - keep your finger on it. Turn power on at wall. Wait 5 seconds, then let go of RECEIPT FEED. You should see "FFFFFFFFFF" on display. Press SUBTOTAL.
Turn back to REG mode and try it. You might have to log a clerk back on after the flag clear. See how you get on.

U need a Casio Communication cable:

Method :
1. Plug the Casio Cable into TK7000(with program) Com1 (It can be found at the side of the cash register body)
2. Plug the Casio Cable into TK7000(without program) Com1
3. Do the following steps at the TK7000 (with program) :
3a. Key turn to PGM
3b. Press [7] [Subtotal]
3c. Press [8] [0] [Subtotal]
3d. Press [9] [0] [0] [Ca/Amt Tend]
4. Press [Subtotal]
5. Key turn back to "reg1"

117 ER & PCR 202
TO PROGRAM TAX PERCENTAGE:

1. TURN KEY TO Z MODE
2. PRESS SUBTOTAL
3. PRESS #NS
4. PRESS TAX% (EX. 8.25% IS 8250) & #NS
5. PRESS 5002 & #NS
6. PRESS #NS






117 ER & PCR 202
TO PROGRAM STATUS OF DEPARTMENT KEYS:

1. TURN KEY TO Z MODE
2. PRESS SUBTOTAL
3. PRESS 02 FOR TAXABLE KEY, & 00 FOR NONTAXABLE KEY
4. PRESS DEPARTMENT KEY
5. REPEAT STEPS 3 & 4 FOR MULTIPLE KEYS
6. PRESS SUBTOTAL

move the pgm key to pgm mode 3 subtotal 125 subtotal ( tax table) rate tax and subtotal beginning  level tax ejemplo : for ten cent = 10  and subtotal 5002 subtotal subtotal. 
to applay the tax to dept or plu 
move the pgm key to pgm mode 3 subtotal 366 subtotal 1 and all dept o plu  subtotal 

THIS WORKS FOR THE TK-4300 ; NOT SURE IF IT APPLIES TO YOUR MODEL..

1. TURN THE KEY TO THE PROGRAM POSITION
2. ENTER 2 AND PUSH THE SUBTOTAL BUTTON
3. ENTER LINE NUMBER + 35 AND PUSH THE SUBTOTAL BUTTON
(EXAMPLE: LINE 1 WOULD BE 135-LINE 2 WOULD BE 235 ECT.)
4. TYPE IN THE MESSAGE FOR THAT LINE AND PUSH THE CASH BUTTON
5. CONTINUE ENTERING LINE NUMBERS AND TYPING MESSAGES FOR EACH LINE
6. PUSH THE SUBTOTAL BUTTON WHEN YOU ARE FINISHED
THERE ARE TWELVE LINES OF MESSAGES YOU CAN PUT ON THE RECEIPT TAPE . EACH LINE CAN CONTAIN 21 CHARACTERS. THAY ARE ALLOCATED AS FOLLOWS: LINE 1-4 ARE FOR THE COMMERCIAL MESSAGE ,LINES 5-8 IS THE BOTTOM MESSAGE, AND LINES 9-12 IS THE LOGO MESSAGE.
THERE SHOULD BE A ALPHA CHART UNDER YOUR MENU SHEET