- Device has a bulk in and bulk out endpoint.
- Packets contain a stream of bytes
- Every command starts with an escape sequence of
1B- Not true, Raster data starts with '4D'
- First BULK_OUT packet contains 100 bytes of
00 - packets can contain multiple commands
- Most of the devices in the PTouch family seem to use a common protocol.
- Found additional documentation for some of the commands (Raster mode)
4d 02 is tiff mode but we're using 4d 00
There seems to be a repeating structure 47 10 followed by 17 bytes
first one starts right after 4d 00
This is raw pixel data. Script can unpack it.
Usefull Documents ive been referencing.
| pcap packet | Command | Decode |
|---|---|---|
| 1 | 00 .. 99 bytes |
invalidate command RCS P.5 |
| 2 | 1B 40 |
Init Command CR P.18 |
| 3 | 1B 69 53 |
Status Information Reqest CR P.18 |
| 15 | device sends status info | |
| 16 | 1B 69 61 01 |
specify Raster Mode 01 CR P.18 |
| 16 | 1B 69 55 .. 17 bytes |
Unknown Command |
| 16 | 1B 69 7a .. 12 bytes |
Send Print Information RCS P.5 |
| 16 | 1B 69 4d 40 |
Unknown Command |
| 16 | 1B 69 4b 08 |
Chain Printing Disabled |
| 16 | 1B 69 64 0E 00 |
Set 2mm margins |
| 16 | `4D 00 .. # a lot | Set compression mode and send graphics? |
| 25 | 32b response | |
| 27739 | 32b response | |
| 5290 | 32b response | |
| 5291 | 32b response |