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Chapter 5: Programming commands128
A776 (B780) Programming Guide A776-PG00001 C 12/09
Erase all ash contents except boot sector
ASCII GS SO
Hexadecimal 1D 0E
Decimal 29 14
Causes the entire ash memory to be erased.
The printer returns ACK if the command is successful; NAK if it is unsuccessful.
Exceptions
Available only in download mode.
Return main program ash CRC
ASCII GS SI
Hexadecimal 1D 0F
Decimal 29 15
Returns the CRC calculated over the ash rmware
code space.
The format of the response is ACK <low byte> <high byte>.
Erase selected ash sector
ASCII GS DLE n
Hexadecimal 1D 10 n
Decimal 29 16 n
Value and range of n: 0–7 = 512k bytes ash
0–15 = 1M bytes ash
0–31 = 2M bytes ash
Erases the previously selected sector. The printer transmits ACK when the sector has been erased. If the previous sector is
not successfully erased, or if no sector was selected, the printer transmits NAK.
Exceptions
Available only in download mode.
Download to active ash sector
ASCII GS DC1 aL aH cL cH d1… dn
Hexadecimal 1D 11 aL aH cL cH d1… dn
Decimal 29 17 aL aH cL cH d1… dn
Value of aL: low byte of the address
Value of aH: high byte of the address
Value of cL: low byte of the count
Value of cH: high byte of the count
Value of d: data bytes, 0–255
Value of n (for number of data bytes) Range of address (aL aH) Range of count (cL cH)
((cH * 256) + cL) 0000–FFFF (hexadecimal) 0001–FFFF (hexadecimal)
Range: Addresses run from 0 to 64K.
Contains a start address (aH × 256 + aL) and count (cH × 256 + cL) of binary bytes to load into the selected sector, followed
by that many bytes. The start address is relative to the start of the sector. Addresses run from
0 to 64K. The count must always be 256.
The printer may return one of several responses. ACK means that the data was written correctly and the host should
transmit the next block. NAK means that, for some reason, the data was not written correctly. This could mean that
Continued . . .