On Tuesday, January 13, 2026 at 9:19:25 AM UTC-5 Adrian Godwin wrote:
Some RS232 converters are biased to accept TTL, and some USB-serial adapters can have inverted data. It's a bodge, but can simplify a board made for a specific purpose like these. Yeah - I took a crash course on the various flavors of serial when I started working with the Noritake display... While *most* devices will work with TTL, the bipolar voltages of 'true' RS232 mean that sometimes the TTL signals from many usb adapters is seen to be inverted... After a lot of poking around I discovered that FTDI - who is the most prevalent usb serial chipset - has a configuration program that allows you to invert any pin you want. That allows common cheap usb adapters to work. But controller projects will need an inexpensive MAX232 adapter to create the 'correct' voltages. If you ever need it, you can download the FT_PROG configuration app from the FTDI website <https://ftdichip.com/utilities/>. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion, visit https://groups.google.com/d/msgid/neonixie-l/53466f13-9faa-436d-8d28-1f1f76ff607en%40googlegroups.com.
