Programmers Guide
TH320/420
108
Reset firmware
ASCII
GS (SPACE)
Hexadecimal
1D FF
Decimal
29 255
Ends the load process and reboots the printer. Before executing this command, the printer should
have firmware loaded and external switches set to the runtime settings. Application software for
downloading should prompt the user to set the external switches and confirm before sending this
command. If the downloading was started from a diagnostic, the reboot will cause the printer to re-
enter download state unless the external switches are changed.
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 communications failed or that the write to flash failed. The alternatives
seem to be to retry the block or halt loading and assume a hardware failure.
Related information
Available only in download mode.
Return paper type description
ASCII
GS 0x8F m
Hexadecimal 1D 8F m
Decimal
29 143 m
Value and range of m: m is the paper type index, (0<=m<=15)
This command will return from flash memory a paper type description indexed by m, (0<=m<=15)
sending back the data sequence used in the download paper type description command, i.e. the
return is 1D 8F m nL nH (d1…dn) which was stored in slot m; or a value of n = 0 if slot m does not
have a description stored. m = 0 x ff asks for a return of the current paper type.
For all valid descriptions, the last two bytes will be a CRC value and the first 24 bytes will be as follows:
#Bytes
Offset
Definition
1
0
Manufacturer paper type category
1
1
Version in type category
1
2
Print head type
1
3
Structure format type
20
4
Descriptive name as a null terminated ASCII string
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