Back to learning how to get an RS485 connection working with a Pi Pico. My goodness, electronics forums are nasty. One search led me to a page where the OP, obviously with English not as a 1st language, described his issue, understanding why his RS485 device only had 3 connections. The 2nd reply linked to a doc called "How to ask a question the smart way" and that was followed with "Absolutely wrong. Learn the electronics basics before posting your misleading statements"
I mean, why bother?
@FrankauLux Thanks. I think the other option is a rs485<->USB device, which means I can leave the pico out of the equation.
Like the OP in that example, I'm still trying to understand why the cabling for rs485 seems to vary between 2, 4 and 5 connections.
I'd been hoping to take a couple of connections straight to the Pico UARTs, but it looks like that's dangerous.