Unisys E-@CTION EFP9800 - Manual (Page 232)

Flash Download Commands
10–4 3255 4073–002
Request Flash Identifier
Returns the size of the flash used. There may be 4, 8, or 16 sectors (64K each) in
flash memory. The numbers returned are the number of sectors minus one (3, 7,
or 15 respectively). This command assures that the firmware to be downloaded
is the appropriate size for flash memory.
Hexadecimal Decimal ASCII
1D 01 29 1 GS SOH
Select Sector to Download
Selects the flash sector for which the next download operation applies.
The printer transmits ACK if the sector number is acceptable; NAK if
unsuccessful.
Hexadecimal Decimal ASCII Value of n
1D 02 n 29 2 n GS STX n 00, 01*
(hexadecimal)
*Note: Send 00 or 01 only.
Request Retransmission of Last Response
Requests the printer to retransmit the last byte of the last response.
Hexadecimal Decimal ASCII
1D 05 29 5 GS ENQ
Check CRC
Causes the printer to calculate the CRC for the currently selected sector. 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.
Hexadecimal Decimal ASCII
1D 06 29 6 GS ACK