Hi all

I need some advise. I have a fully working module that talks to my Epson TM-88IV thermal printer on comport and it works perfectly

And now I want to try and use a USB version of it

So I have found on my system /dev/usb/lp1 and I can echo to it with no problems

The problem I seem to have is when I try to open the port in my status module I get a error message saying "Stream is closed"

Do I handle usb connected devices differently then serial? Some advice would be welcomed.

I can easily add a option for usb to the current module as long as I know what I need to update (I assume one the dev is open it should still communicate the same within the code)

If anyone needs to see the actual module I can upload that

Andy

Error message on screen

(Click to enlarge)

how exactly do you try to open it?

From what I can see, there is a Linux Printer driver for your printer. Why not install that and just send a page to the printer or as I do with a Zebra Printer, create a PDF file and send that to the printer?

cogier said

From what I can see, there is a Linux Printer driver for your printer. Why not install that and just send a page to the printer or as I do with a Zebra Printer, create a PDF file and send that to the printer?

If I used the driver I loose all control
Over the printer and I will not get any status about the cash drawer etc from the printer.

BruceSteers said

how exactly do you try to open it?

I was trying to open it just like a Serial Printer


I know it is not a Serial device so I would need to do some update to my code to work with the USB Printer

If I used the driver I loose all control
Over the printer and I will not get any status about the cash drawer etc from the printer.

I found this command online tail -f /var/log/syslog. If you run the command in Terminal, then change the cash draw status, you may be able to see it as it happens. (Press [Ctrl]+C to exit). Every time I changed a USB, or turned a printer on, data poured in.

cogier said

If I used the driver I loose all control
Over the printer and I will not get any status about the cash drawer etc from the printer.

I found this command online tail -f /var/log/syslog. If you run the command in Terminal, then change the cash draw status, you may be able to see it as it happens. (Press [Ctrl]+C to exit). Every time I changed a USB, or turned a printer on, data poured in.

Hi cogier I tried that and I get nothing showing up

I have install my development IDE (gamabs3) onto the PoS Terminal that has the USB printer attached (/dev/usb/lp0) I have chmod 777 the port so anyone can access it and when I run the printer module now insde the IDE I get the following error message "Unable to get configuration: Inappropriate ioctl for device"

I was setting it to /dev/usb/lp0 and speed of 115200

am I thinking along the right lines for the USB Printer or do I need to re think this?

After a lot of googling and asking ChatGPT I have come up with the following code (Still needs work though)


But I am still getting a Error connecting to USB Printer and then the same error message steam is closed (#53) could some one have a look and see if I am on the right lines (should the device not show up as a /dev/ttyUSB and not /dev/usb/lp1 (im on debian))


Chatgpt  came up with this one


Of course I have had to update it to work