Crown MRX-24 Quick Reference Manual

* System
@crown
®
MRX-24
Overview
The MRX-24 ™
is a computerized relay patch
bay system. It also is available in a slave ver-
sion ( MRX-24S ). Operating under IQ control,
both versions have 24 DPST (balanced) re-
lays, arranged in four groups of six (four 6x1),
for switching electrical signals. The MRX-24/
24S is ideal for routing balanced audio from
microphone level to 70V speaker level, AC
or DC power, digital signal routing and switch-
ing, and other electrical signals. Each relay
can handle at least 1 ampere at 100V (0.5 A
while switching). Pictured to the right are the
front panels of an MRX-24 and an MRX-24S .
Simple descriptions follow that introduce
each feature of the unit, and provide brief
overview of operation and basic electrical
specifications.
Masters and Slaves
In terms of practical operation, the slave ver-
sion is almost identical to the master version.
A slave utilizes the microprocessor of its
master to operate its own relays. Up to 31
slaves may be operated from any one mas-
™
ter, including MRX-12 master units ( MRX-
12 is another Matrixer model with a different
relay configuration). Without its own proces-
sor, slave unit Aux ports are inoperative and
it has no battery backup. Slaves communi-
cate with their master via special slave bus,
and the addressing of masters and slaves is
B
MRX-24/24S MODULE CIRCUIT BOARD
® Quick Reference
™
/24S MATRIXERS
handled differently. By using the pro-
cessing power of a master unit, using
slaves in larger Matrixer systems is
highly cost effective.
IQ-CAG Card Cage Installation
All IQ Matrixer units are designed for
easy installation into a Card Cage. The
IQ-CAG is a four rack space cage
which can hold about 6 MRX modules
plus an IQ-LPS +12 VDC Linear Power
Supply. Matrixers require +12 VDC. If
an IQ-LPS is not used, another supply
such as an adaptor or battery is re-
quired. Components designed to
mount in the IQ-CAG are modular in
construction. They slide into the cage
on rails, and are held in place by small
screws. At the rear of the cage "T-
board" is used to provide connection
to relays, and for digital communica-
tion. The T-board for MRX-24/24S units
is shown on the following page.
Front Panels
Front panels for both versions are
shown to the right. On each is a power
indicator showing that the unit is powered by
+12 VDC. A DSPI indicator also lights up to
indicate that digital information addressed to
that unit is being received. When power is
removed an internal battery will maintain pro-
A
MRX – 24
DSPI
POWER
1718 W. Mishawaka Rd.
Elkhart, IN 46517 U.S.A.
MRX-24 (MASTER) & MRX-24S (SLAVE)
gramming memory in a master unit for at least
60 days.
A. Relays
MRX-24/24S relays are DPST devices which
F E C
MRX – 24
DSPI
POWER
1718 W. Mishawaka Rd.
Elkhart, IN 46517 U.S.A.
D