Epson A794-D100 - Manual (Page 132)

Chapter 6: Programming Information A794 Owner’s Guide
March 1999 126
Download to Active Flash Sector
Contains a start address (ah x 256 + al) and count (ch x 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 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.
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 (it is sent before the high byte)
Value of ah = high byte of the address (it is sent after the low byte)
Value of cl = low byte of the count (it is sent before the high byte)
Value of ch = high byte of the count (it is sent after the low byte)
Value of d = data bytes, from 1 to n
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.
Related Information
Available only in download mode.