Control Codes
Double Level Loader
It is desirable in some applications to allow the host application to enter boot load mode and update the firmware. Normally this is prevented by design, and it is not possible for the normal operating mode of the printer to enter the factory boot mode. A Watch Dog timer will reset the printer if abnormal conditions are detected; this timer protects the normal operating mode from being corrupted by an unexpected event. The factory boot loader does not support the Watch Dog timer. If for any reason, the normal operating mode enters the factory boot loader, the printer will reset in about 500 mS.
To allow the application to update the operating firmware, an optional second loader is provided.
Entering Field Boot Load Mode.
To enter field Boot Load mode, the following command should be used:
Function Enter Field Boot load mode
ASCII [ESC] ~[SO]% or [ESC] ~[SO]# or [ESC] ~[SO]$
Hexadecimal 1BH 7EH 0EH 25H Decimal <27> <126> <14> <37>
Description This command waits for 200 Ms for the printer to be idle, turns off all active drivers and enters Field Boot load mode. No communications should be attempted for 2 seconds after this command is processed.
When In Field boot load mode, the firmware image file provided by Transact should be sent to the printer. The communications will be the same as normal operating node.
The [ESC] ~[SO]# and [ESC] ~[SO]$ commands also enter boot load only the way the USB enumerates may be altered. [ESC] ~[SO]# forces the boot load USB enumeration to use a different PID (Product Identification). This allows a different Windows driver to be evoked. [ESC] ~[SO]$ forces the boot load to use the same PID as normal operation. This will force Windows to envoke the same driver that is used for normal operation. The [ESC] ~[SO]% will use the current configuration.
Note: [ESC] ~[SO]# and [ESC] ~[SO]$ alter the configuration.
There are several commands available in field boot load mode that may be used by the host application to query the printer.
Function | Returns the boot loader ID | |
ASCII | [STX]B |
|
Hexadecimal | 02H 42H | |
Decimal | <2> <66> | |
Description Returns the Field Boot loader ID, e.g.
| Page 177 |
|
|
