Epson A794-D100 - Manual (Page 130)

Chapter 6: Programming Information A794 Owner’s Guide
March 1999 124
Select Flash Memory Sector to Download
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
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
Exceptions
Available only in download mode.
Get Firmware CRC
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.
ASCII GS ACK
Hexadecimal 1D 06
Decimal 29 6
Return Boot Sector CRC
Returns the CRC calculated over the boot sector code space.
ASCII GS BEL
Hexadecimal 1D 07
Decimal 29 7
Formulas
ACK