simplex printer

communications A term applied by Western Union Telegraph

Company to teletypewriters that are not part of a

multiplex system. They usually provided for alternate

transmission in both directions. If working simplex or

half-duplex, what was keyed in at the keyboard would be

typed out at the printing portion. If working full-duplex,

sending would be blind as the printing portion was being used

only for reception.

(2000-04-02)