Cognitive Solutions A776 Manual De Usuario

A776 (B780) Programming Guide 

A776-PG00001 C 12/09

ASCII 

GS SO 

Hexadecimal  1D 0E 

Decimal 

29 14

Causes the entire flash memory to be erased.

The printer returns ACK if the command is successful; NAK if it is unsuccessful.

Available only in download mode.

ASCII 

GS SI 

Hexadecimal  1D 0F 

Decimal 

29 15

Returns the CRC calculated over the flash firmware  
code space. 

The format of the response is ACK <low byte> <high byte>.

ASCII 

GS DLE n 

Hexadecimal  1D 10 n 

Decimal 

29 16 n

Value and range of n: 

0–7 =   512k bytes flash 

 

 

0–15 =  1M bytes flash 

 

 

0–31 =  2M bytes flash

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.

Available only in download mode.

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

high byte of the address

low byte of the count

Value of cH: 

high byte of the count

data bytes, 0–255

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