126 Chapter 5: Programming commands

This command returns the state of occupancy of available flash storage and user RAM. The printer response for each item is a 4 byte header, 0x1D 0x97 nL nH (number of bytes that follow in the response) and for each item a

4 byte structure: 1st m (type) byte, 2nd n index byte followed by a 2 byte CRC in Lo Hi order of the data string in that storage space.

The return for m = 0–2 is the header and one 4-byte item giving remaining storage space in the CRC position in

Lo Hi order: 1D 97 4 0 m 0 fL fH, where f is the kBytes of storage remaining. Note that RAM storage space is not content typed, while available flash is statically divided into logo, character set, and user data types. Change of the divisions is possible via flash erasure and flash

allocation commands.

If the communication protocol is RS-232C – Xon/Xoff, then “X symbol substitution response” should be configured with the setting communications parameters command (US STX , 1F 02).

Flash download

These commands are used to load firmware into the printer.

The commands are listed in numerical order according to their hexadecimal codes. Each command is described and the hexadecimal, decimal, and ASCII codes are listed.

There are three ways to enter the download mode.

1. Powering the printer up with DIP Switch 1 up.

2. While the printer is running normally, send the command, “Switch to flash download mode” (1B 5B 7D) to leave normal operation and enter the download mode.

3.If the flash if found corrupted during level 0 diagnostics the download mode is automatically entered after the printer has reset.

The printer never goes directly from the download mode to normal printer operation. To return to normal printer operation either the operator must turn the power off and then on to reboot or the application must send a command to cancel download mode and reboot. DIP switch 1 must in UP position during reboot to return to normal printer operation.

When each flash download command is received, the printer returns either ACK or NAK to the host computer when each command is received:

•ACK (hexadecimal 06)

Sent when the printer has received a host transmission and has completed the request successfully.

•NAK (hexadecimal 15)

Sent when a request is unsuccessful.

Communicates to the printer information downloaded from applications. Data is downloaded to flash memory to query the state of the firmware, calculate the firmware CRC and other functions.

Switch to flash

download mode

ASCII

ESC [ }

Hexadecimal

1B 5B 7D

Decimal

27 91 125

Puts the printer in flash download mode in preparation to receive commands controlling the downloading of objects into flash memory. When this command is received, the printer leaves normal operation and can no longer print transactions until the reboot the printer command (1D FF) is received or the printer is rebooted.

This command does not affect the current communication parameters. Once the printer is in flash download mode, this command is no longer available.

Related information

See entering flash download mode elsewhere in this book to put the printer in flash download mode using the configuration menu.

A776 (B780) Programming Guide

A776-PG00001 C 12/09

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Cognitive Solutions B780, A776 manual Download mode, Hexadecimal 1B 5B 7D Decimal 27 91
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B780, A776 specifications

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