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Hi @nmcleese, I should clarify my comments. If you want to connect a full voltage RS232 device (which is what you have) to a Raspberry Pi via USB which is what it looks like most people are doing here, you don’t need a level shifter. You need a USB to RS232 adaptor, and that adaptor needs to...

Fantastic project you all have going on here. I see a few people having problems with USB-RS232 adaptors and RS232 connections in general. I think the problem some of you may be running into is the different electrical standards for RS232. The original RS232 (lets call it full voltage RS232)...