Samsung ER-350 Operator's And Programming Manual page 13

X/TM - X/TIME key is used to set up the time in PGM mode.
Used for multiplication of items entries in REG and VOID mode.
Used to read the TIME report in X mode.
Used to read and reset the TIME report in Z mode.
Used to program the descriptor (department, PLU, customer)
in Z mode.
VD - VOID key is used for item void operation in REG and VOID mode.
RF - RETURN MERCHANDISE key is used for refund operation in REG mode.
Used to set up the decimal and tax information in PGM mode.
- - MINUS key is used to register a negative amount in REG and VOID
mode.
Used to set up the TAX calculation status in PGM mode.
-% , +% - PERCENT key is used to subtract or surcharge a percentage
from an item, or the subtotal in REG and VOID mode.
Used to set up the percent rate and TAX calculation status
in PGM mode.
PLU - Used to register a Price Look Up(PLU) in REG and VOID mode.
Used to read the PLU report in X mode.
Used to read and reset the PLU report in Z mode.
Used to program the PLU in PGM mode.
RA - RECEIVED ON ACCOUNT key is used for received on account operation
outside of a sale in REG and VOID mode.
Used to set up system option with PAID OUT key in PGM mode.
PO - PAID OUT key is used for paid out operation outside of sale
in REG and VOID mode.
Used to set up function of the receipt buffer in REG and VOID mode.
Used to set up system option with RECEIVED ON ACCOUNT key
in PGM mode.
TAX - Used for external straight tax calculation in REG and VOID mode.
Used to set up the tax rate in PGM mode.
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- DECIMAL key is used for numeric entries in REG, VOID, and PGM mode.
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