Return boot sector firmware part number

Chapter 5: Programming commands 127

ASCII	GS NULL
Hexadecimal	1D 00
Decimal	29 0

Returns ACK (Hex 06) + 12 bytes ASCII string describing the flash memory boot sector firmware part number. Ex : 189–1234567A

Exceptions

Available only in download mode.

Return segment number status of flash memory

ASCII	GS SOH
Hexadecimal	1D 01
Decimal	29 1

Returns the size of the flash used. There may be 16

(1 Meg) or 32 (2 Meg) sectors in flash memory. This command assures that the firmware to be downloaded is the appropriate

size for flash	memory. The value returned is the maximum sector number that can be accepted by the select sector to
download (1D 02 nn) command.
Exceptions
Available only in download mode.

Select flash	memory sector to download
ASCII	GS STX nn
Hexadecimal	1D 02 nn
Decimal	29 2 nn
Value of n:	The flash sector to which the next
	download operation applies
Range of n:	0

Selects the flash sector (n) for which the next download operation applies. The values of the possible sector are restricted, depending upon the flash part type. The printer transmits an ACK if the sector number is acceptable or an NAK if the sector number is not acceptable. Sector numbers start at 0.

Exceptions

Available only in download mode.

Get firmware CRC

ASCII	GS ACK
Hexadecimal	1D 06
Decimal	29 6

Causes the printer to calculate the CRC for the currently selected sector and transmits the result. 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.

Return microprocessor CRC

ASCII	GS BEL
Hexadecimal	1D 07
Decimal	29 7

Returns the CRC calculated over the boot sector code space.

Formulas

ACK <low byte> <high byte>

A776-PG00001 C 12/09

A776 (B780) Programming Guide

B780, A776 specifications

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Cognitive Solutions A776, B780 Return boot sector firmware part number, Memory sector to download

Models: B780 A776