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This depends on what you mean by RS-485. RS-485 on paper is just a physical layer electrical standard, which Glasgow cannot correctly implement alone as it only has single-ended main I/O (LVDS port notwithstanding, but it's not protected/capable of this either)
However, when *most* people say RS-485 they mean "RS-232 style UART over RS-485". Glasgow already has a UART applet. So assuming you mean *that*: 1) If you need "true" RS-485, you need an external transceiver, and then the UART applet needs a minor change to add a TX enable pin.
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).
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