8
SHM-NPR PLUS
to the remote DTE. In this way, one control signal can
be passed end-to-end across the link. (DCD is always
on regardless of how transmit carrier is strapped.)
The SHM-NPR Plus operates without a power-supply
transformer. To operate properly, it must at least be
connected to a DTE’s Transmit Data (TD, Pin 2), Receive
Data (RD, Pin 3), and Signal Ground (SGND, Pin 7) lines.
In compliance with the RS-232/V.24 standard, the
SHM-NPR Plus generates positive and negative signals
regardless of the state of Transmit Data; that is, the line
may be constantly high or constantly low.
