You don't even need that --- the RPi has got a proper TTL UART. Two, in fact, although as you can only use one at a time that doesn't get you much. Any TTL seri

You don't even need that --- the RPi has got a proper TTL UART. Two, in fact, although as you can only use one at a time that doesn't get you much. Any TTL serial adapter will just plug straight in.