Monroe Electronics R173 - Manual (Page 7)

7
R173 Rear Panel Connector Placement/Notation
The terminal blocks are in
groups of 8 inputs, with
each group associated
with one of the 3185E
cards installed. NC is the
normally closed contact
on the 3185E board, NO
the normally open contact,
and the COM terminal s
the common of the relay
contacts. SET, when momentarily
pulled to GND, turns ON
the 3185E card, closing
the relay.
RESET, when
momentarily pulled to
GND, turns OFF the
3185E card, opening the
relay. Note that if the 3185E
card has been SET or
RESET by one of the
contacts, it may also be
turned OFF or ON with the
DTMF tones it is
programmed to. Also, if the 3185E card(s)
is (are) set by means of
the jumpers on the main
board to receive audio
from the telephone line,
when the 3185E card(s) is
(are) switched on the
telephone audio is present
at the AUD-SW.