Crown MRX-12S Quick Reference Manual

Matrixers
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@crown
®
MRX-12

Overview

The MRX-12
is a computerized relay patch
bay system. It also is available in a slave ver-
sion ( MRX-12S ). Operating under IQ control,
both versions have twelve 1x1 SPST relays
for switching electrical signals. The MRX-12/
12S is ideal for routing unbalanced audio from
line level to high powered speaker level, AC
or DC power, digital signal routing and switch-
ing, and other electrical signals. Each relay
can handle at least 6 amperes at 240V. Pic-
tured to the right are the front panels of an
MRX-12 and an MRX-12S . Simple descrip-
tions 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-24
master units ( MRX-
24 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
handled differently. By using the processing
power of a master unit, using slaves in larger
B
MRX-12/12S MODULE CIRCUIT BOARD
®
Quick Reference
/12S MATRIXERS
Matrixer systems is highly cost effec-
tive.

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 construc-
tion. 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 Communication. The T-board for
MRX-12/12S units is shown on the fol-
lowing page.

Front Panels

Front panels for both versions are
shown to the right. On each is a power
indicator showing that the unit is pow-
ered 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 programming memory in a mas-
ter unit for at least 60 days.
A
MRX – 12
DSPI
POWER
1718 W. Mishawaka Rd.
Elkhart, IN 46517 U.S.A.
MRX-12 (MASTER) & MRX-12S (SLAVE)

A. Relays

MRX-12/12S relays are SPST devices which
can handle 25 Amperes at 250V, and are ar-
ranged as a bank of 12 1x1 relays. By tying
relays together at the T-board, any ma
F
E
C
MRX – 12
DSPI
POWER
1718 W. Mishawaka Rd.
Elkhart, IN 46517 U.S.A.
D

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Summary of Contents for Crown MRX-12S

  • Page 1 The MRX-12 is a computerized relay patch bay system. It also is available in a slave ver- sion ( MRX-12S ). Operating under IQ control, both versions have twelve 1x1 SPST relays for switching electrical signals. The MRX-12/ 12S is ideal for routing unbalanced audio from...
  • Page 2 On slave units this set of switches is out of circuit and unused. Up to 250 master units can be used on any one Crown Bus serial data loop to the system interface. E. Battery Backup Master units have a battery installed to maintain processor memory when the +12 VDC supply is lost.
  • Page 3 It normally operates on a simple two-wire 20 mA current loop (fiber optic optional). See also item J. When operating on a Crown Bus loop, a system interface is required for com- munication with a computer. A Drone can also be used to manipulate MRX modules.

This manual is also suitable for:

Mrx-12

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