M-S Cash Drawer A794 - Manual (Page 141)

Chapter 6: Programming Information A794 Owner’s Guide
December 1999 136
Return Boot Sector Firmware Part Number
ASCII GS NULL
Hexadecimal 1D 00
Decimal 29 0
Returns ACK (Hex 06) + 12 bytes ASCII string describing the Flash Memory Boot sector
Firmware part number. Ex : 189-1234567A
Exceptions
Available only in Download Mode.
Return Segment Number Status of Flash Memory
ASCII GS SOH
Hexadecimal 1D 01
Decimal 29 1
Returns the size of the Flash used. There may be 4, 8, or 16 sectors (64K each) in Flash
Memory. This command assures that the firmware to be downloaded is the appropriate
size for Flash Memory. The value returned is the maximum sector number that can be
accepted by the Select Sector to Download (1D 02 nn) command.
Exceptions
Available only in Download Mode.
Select Flash Memory Sector to Download
ASCII GS STX nn
Hexadecimal 1D 02 nn
Decimal 29 2 nn
Value of n: the Flash sector to which the next download operation applies
Range of n: 0
Selects the Flash sector (nn) for which the next download operation applies. The values
of the possible sector are restricted, depending upon the Flash part type. The printer
transmits an ACK if the sector number is acceptable or an NAK if the sector number is
not acceptable. Sector numbers start at 0.
Exceptions
Available only in Download Mode.
Get Firmware CRC
ASCII GS ACK
Hexadecimal 1D 06
Decimal 29 6
Causes the printer to calculate the CRC for the currently selected sector and transmits
the result. This is performed normally after downloading a sector to verify that the
downloaded firmware is correct. The printer also calculates the CRC for each sector
during power up and halts the program if any sector is erroneous.
The printer transmits ACK if the calculated CRC is correct for the selected sector; NAK
if the CRC is incorrect or if no sector is selected.