Matrix Orbital GLT240128 Legacy - Manual (Page 49)

Host Display Comments
0xFE Command Prefix
0x24 Upload Font File Command
0x01 Reference ID
0x19 Size (LSB)
0x00 Size (MSB)
0x01 Confirmation Byte
0x01 Confimation Byte
0x05 Font Width
0x05 Echo Font Width
0x01 Confimation Byte
0x07 Font Height
0x07 Echo Font Height
0x01 Confimation Byte
0x49 Font ASCII Start Value
0x49 Echo Font ASCII Start Value
0x01 Confimation Byte
... ... ...
0x60 Last Font File Byte
0x60 Echo Last Font File Byte
0x01 Confirm Upload Finished
Table 48: Upload Protocol
The last part of uploading a font file is to upload the file data. After transmitting each byte of the file the
module will echo the byte and wait for a confirmation byte of 0x01 until the file has completed uploading.
Below is an example of uploading the font file which we created in Section 5.1.2 on page 22.
At times that the display or the host sees anything else other than 0x01 for confirmation (usually a 0x08)
the upload is aborted.
NOTES
• The GLT24064 has watch dog timer, set to 2.1 seconds in between transmissions, in
order prevent the display module from staying in a waiting state.
• Once the timeout has been reached the timer will reset the display and issue a 0xFE
0xD4 response to the host to signal that this has happened.
Matrix Orbital GLT240128 44