Crown MRX-12, MRX-12-S Owners manual
@crown
* System® Quick Reference
®
MRX-12™/12S MATRIXERS
Overview
The
MRX-12
bay system. It also is available in a slave version (
both versions have twelve 1x1 SPST relays
for switching electrical signals. The
is ideal for routing unbalanced audio from
12S
line level to high powered speaker level, AC
or DC power, digital signal routing and switching, and other electrical signals. Each relay
can handle at least 6 amperes at 240V. Pictured to the right are the front panels of an
MRX-12
tions follow that introduce each feature of the
unit, and provide brief overview of operation
and basic electrical specifications.
™
MRX-12S
and an
is a computerized relay patch
). Operating under IQ control,
MRX-12/
MRX-12S
. Simple descrip-
Masters and Slaves
In terms of practical operation, the slave version 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 master, including
24
is another Matrixer model with a different
MRX-24
relay configuration). Without its own processor, slave unit Aux ports are inoperative and
it has no battery backup. Slaves communicate 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
™
master units (
MRX-
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 required. 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 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 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 programming memory in a master unit for at least 60 days.
MRX–12
DSPI
POWER
1718 W. Mishawaka Rd.
Elkhart, IN 46517 U.S.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
can handle 25 Amperes at 250V, and are arranged as a bank of 12 1x1 relays. By tying
relays together at the T-board, any ma
relays are SPST devices which
B CEA
MRX-12/12S MODULE CIRCUIT BOARD
8
7
6
5
4
3
12
FD
trix can be formed with the necessary number of MRX modules. Although relays carry a higher current rating, traces running to the relays can only handle 6 Amperes of continuous (RMS or DC) current. If
a musical signal, however, the dynamic nature of audio allows for much
higher peaks. In most cases over 1000W of audio can safely be delivered to a 2 ohm speaker load, over 2000W into 4 ohms, and over
4000W of audio into an 8 ohm load.
B. Edge Connector
When installing the MRX module into the cage, the edge connector
seats into a female edge connector mounted to the T-board. Note that
traces for relays #5, #6, #11, and #12 are enhanced to handle 50%
more current.
7T1 REL
7
T
2 REL
T
1 REL
8
8
T
2 REL
REL 1T1
REL 1
REL 2
REL 2
T
2
T
1
T
2
C. MRX Microprocessor
Only master MRX units have an installed microprocessor. Slave units
operate by special communication, called a Slave Bus, with a master
unit.
D. IQ Component Address
Both master and slave units have this DIP switch on their circuit boards,
but the address is only used with master units. 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. This battery will maintain memory for
at least 60 days.
F. Battery Backup Enable Jumper
A jumper is provided to disable battery backup if that feature is
not desired.
G
G. Relay Connectors
Connections to relay contacts are made via lug. These lugs are
large enough to connect two #12 AWG wires. Two lugs are provided per relay (one on each side of the contact).
K
H. Power Supply Connection
Plated holes are provided for connection of +12 VDC and ground
from an IQ-LPS or other 12 volt supply. Holes are sized to accept #6 screws.
I
J
I. Sensing Aux Port
A mini-barrier block connector is provided for auxiliary functions.
+10 VDC at 20 mA is output at Aux Out when switched on. Aux
In senses voltage: if +3 to +20 VDC is sensed (with respect to
Aux Ground), the microprocessor will interpret the voltage as a
digital high (on condition). Note that although both the master
and slave versions have this connection, only the master’s Aux
port is operational.
H
T
1 REL
9
9
T
2 REL
T
1 REL
10
10
T
1 REL
11
T
1 REL
11
T
2 REL
T
1 REL
12
12
T
2 REL
BOARD
ADDRESS
SB +12
PULLUP
+12 V
GND
16
8
4
2
1
AUX GND
AUX OUT
AUX IN
+OUT
IQ BUS
–OUT
GND
MRX-12
T-BOARD
460017
+IN
–IN
5
4
3
12
XB4
XB3
XB2
XB1
SLAVE
BUS
CONNECTIONS
SB GROUND
T
REL 3
REL 3
T
REL 4T1
REL 4
T
REL 5
T
REL 5
T
T
REL 6
REL 6T2
SB8
SB7
SB6
SB5
SB4
SB3
SB2
SB1
+12 V
GND
1
2
2
1
2
1
M
L
N
J. Crown Bus
A 5-pin mini-barrier block connector is provided for digital communication via the Crown Bus serial data loop to other IQ components. This
connector is only used by master units (present on both).
K. Board (Slave) Address
Master units communicate with other IQ system components via Crown
Bus, and thus use the IQ Address setting (item D). Slave units use the
Board Address to identify themselves to the master unit. The five posi-
MRX-12/12S “T-Board” For
External Connections
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