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2) if you just need to talk to "some" RS-485 device or a few in a controlled situation, you could further extend the UART applet to fake a RS-485 bus with two single-ended I/Os, assuming your grounds are common and sane, and get away without using a transceiver.
This will work because RS-485 is usually implemented using 0V/5V single-ended signal levels, and Glasgow supports 5V logic (that's in fact the maximum supported I/O voltage).
I’m principally interested in interacting with / observing SIA OSDP which is implemented as a serial 2 wire RS485 multi drop bus.
Right, so the question is whether you're talking to one or two devices with very short cables in a controlled tabletop lab scenario (then option 2 will probably work), or whether you need to talk to an actual bus with proper termination over a longer distance (then you need 1).
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