Mini Thermal Printer Doesn't Connect Over Serial Moderators: adafruit_support_bill, adafruit

[bellab]

Hello,

I purchased a Mini Thermal receipt Printer Starter Pack on July 12th (order number 2322606), and I haven't been able to get it to print over serial. The test print page works, but nothing else.

I have followed this tutorial: https://learn.adafruit.com/networked-th ... re-printer

When I run this code on my Raspberry Pi 3 or my Raspberry Pi Zero, the terminal hangs and nothing prints.

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stty -F /dev/ttyAMA0 19200
echo -e "This is a test.\\n\\n\\n" > /dev/ttyAMA0

I have used two separate Raspberry Pis, tried booting different OS's, and have double checked the wiring (which I've included a picture of). I've disabled the serial console and enabled serial hardware on my pi like the tutorial I linked told me to do, the printer is on, and I'm using the baud rate listed on the test page.

I'm stumped on what to do next, and I hope I don't have a faulty printer. Any help would be appreciated. Thank you!

[adafruit_support_carter]

Please post a photo of the self test printout. It has some info on it that might help.

[bellab]

Attached is the self test. Apologies for not thinking to include it before!

[adafruit_support_carter]

Thanks. That looks like the printer is configured correctly.

Did you disable the serial console in raspi-config?

Also, you probably want to use serial0 instead of ttyAMA0

[bellab]

I disabled the serial console and enabled serial hardware. The tutorial I linked in my original post said that if using serial0 didn't work, some models of pi use ttyAMA0. Neither work for me when trying to print.

[adafruit_support_carter]

Sorry, I see you mentioned that in your first post also.

Let's verify those settings. Can you attach your /boot/config.txt and /boot/cmdline.txt files here.

[bellab]

Here are the requested files

[adafruit_support_carter]

Thanks. That looks as expected.

Are the headers on the Pi Zero soldered on?

And just to be sure - you got the same behavior on both a Pi 3 and the Pi Zero shown? And also same behavior if you use serial0?

[bellab]

Yes, the headers on the Pi Zero are soldered on, and I've experienced the same behavior from both Pis and with both serial0 and ttyAMA0.

[adafruit_support_carter]

I just tested the behavior here. Even if I completely disconnect the printer, I don't get the Pi to hang when sending out the print command with:

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echo -e "This is a test.\\n\\n\\n" > /dev/serial0


The command runs and immediately returns to the command prompt.

If I send to an unconfigured port, like ttyAMA0:

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echo -e "This is a test.\\n\\n\\n" > /dev/ttyAMA0


the command does not return. The Pi is not frozen though. I can abort the command with <CTRL><C> and get back to the command prompt. Are you able to do that?

[bellab]

I am not able to do that.

[adafruit_support_carter]

And you get that same behavior on both the Pi 3 and the Zero? If so, there's something else going on unrelated to the printer.