Download to Active Flash Sector

This command 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.

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, from 1 to n

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 communications failed or that the write to Flash failed. The alternatives seem to be to retry the block, or halt loading and assume a hardware failure.

Value of n (for number of data bytes)	Range of Address (al ah)	Range of Count (cl ch)
((ch * 256) + cl)	2000-FFFF (hexadecimal)	0001-0400 (hexadecimal)

Range

The addresses run from 0 to 64K.

Exception

This command is available only in Download Mode.