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)