RS423 is a unbalanced serial interface for the transmission of digital data. The EIA describes RS423 as a DTE to DCE interface only containing the electrical characteristics.
pin
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direction
description
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1
see note
Tranceiver Voltage Range -6 to +6 v,Minimal Voltage at Receiver -0.2 or +0.2 , Speed VS Distance - 1 kbps @ 1200m (4000 ft)