Grumpy_Mike:
but they will easily interface to an Arduino.
Will they?
How?
The speak async serial at TTL level. So you would open a serial connection and read and write.
Possible problems? Most Arduinos are already using the serial port to talk to the IDE. One exception is the MEGA2560 which has extra ports.
A work around is the Soft Serial library which "bit bangs" the serial link.