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Chapter 6: Programming Information A794 Owner’s Guide
March 1999122
Flash Download Commands
These commands are used to load firmware into the printer.
There are three ways to enter the download mode.
1. Powering the printer up with DIP Switch 1 down.
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.
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.
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.