Mini Thermal Printer doesn't accept printing parameter commands

Support
1

My ‘mini thermal printer’ doesn’t seem to accept the ‘Control Parameter Commands’ described in section 5.2.9 of the manual on the product page.

Specifically, the sequences ‘ESC 7 n1 n2 n3’ and ‘DC2 # n’ do not have the expected effect (changing the print speed/density), and the printer prints out ASCII characters corresponding to whatever values I used for n1, n2, n3 etc.

Are pimoroni able to provide a reference for the command set actually supported by this printer?

The firmware version printed by the self-test is “GV2.16.08 20180627_R”.

2

Same for me, see my Post for a picture.

3

Did you get any Information?
Or did you send back the printer ?

4

Hi. I’m disappointed to say that I haven’t had any information from pimoroni about this.

For my own purposes, I’ve found that with a good ~4A 5V supply, the printer works well and I haven’t worried about the missing commands. I guess it’s possible that the manufacturer has removed the configuration command (possibly because they think they’ve perfected auto compensation)…

I did try using a hefty 9V supply as well, but this caused the paper to feed so quickly that the print head had trouble keeping up and the density was much lower.

5

Hi,

I contacted Pimoroni support via Mail an got a solution, my first unit seems to be defective.
See: Mini Thermal Printer missing pixels dull printing
Perhaps Pirmoroni would accept a replace in your case too due to the posting in this forum ?