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I have two USB printers, both of which have different device and product ID's:

Bus 001 Device 005: ID 222a:0037
Bus 002 Device 003: ID 0493:8760 MAG Technology Co., Ltd

When I try map them in the printer set up, they are both recognised with the URI 

usb://Unknown/Printer

The second printer (0493:8760) also allows me map to :

usb://Unknown/Printer?serial=Zijiang

but it does not require the serial entry on the end. To add a complication, only the second printer maps to lp0, the first does not.

Both printers can print successfully when separately connected but I need to specify which to print to while both are connected.

Does anyone know how I can name these printers, whether through udev rules or other means.

This answer is helpful How to distinguish between identical USB-to-serial adapters? but I was unable to map the udev rules, possibly related to the Unknown printer status.

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1 Answer 1

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After much investigation, it turned out that both printers I was using were parallel to USB converted. The printers themselves have a USB port each on them but internally, it seems, there was a converter used.

To solve this, I bought a different printer model as the second printer.

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