Oxmoor RMX-44 - Manual (Page 9)

Page 7
RMX-44 & RMX-62 SET-UP (CONTINUED)
(Please refer to Figures 3.2, 3.3, 3.4 and 3.5)
SOURCE TO OUTPUT ROUTING SELECTIONS
The signal source for each RMX-44 and RMX-62
output may be independently selected. You may
select one input per output (buffer), multiple in-
puts per output (mixer), or multiple outputs per
input (DA).
FIXED INPUT/OUTPUT
ROUTING CONFIGURATION
Inputs may be routed to outputs in a simple fixed
configuration using jumpers in a DB-25 male con-
nector (supplied). The RMX-44 and RMX-62 come
supplied with a DB-25 male connector with jump-
ers soldered in place to provide a working, out-of-
the-box routing configuration. Merely inserting this
connector into the Control Port will assign the
audio sources to outputs as specified in Figures 3.2
and 3.4.
Alternative jumper positions between "common"
pins (numbers 1 through 3 and 14 through 16) and
others will provide alternate routing possibilities
as designated by their Assignment descriptions in
Figures3.3 and 3.5.
SELECTABLE INPUT/OUTPUT
ROUTING CONFIGURATION
Maximum flexibility of the RMX-44 and RMX-62
is realized, though, when the routing selection is
locally or remotely selectable. This is accomplished
through closure of external latching contacts (end
user provided). Each switch is used to close a cir-
cuit between two pins (one of them "common") of
the 25 pins available at the "control port" on the
rear of the chassis.
The internal routing matrix is connected by indi-
vidual control lines to the control port. This allows
any internal switch to be activated by directly ac-
cessing its control line without having to resort to
any binary/BCD type encoding.
The logic inputs have an active low (CLOSURE TO
COMMON) type action and are provided with in-
put protection. (See SPECIFICATIONS for details on
logic requirements.)
Any logic action must provide and maintain circuit
closure between common and appropriate control
lines to hold the internal switches for the routing
configuration desired.
Integral input isolation allows the logic inputs of
multiple units to be paralleled without any interac-
tion between units or bus loading problems. No ex-
ternal pull-ups are required. A maximum of 64 con-
trol lines may be paralleled without affecting opera-
tion.
NOTE: If the CONTROL PORT is not configured,
all outputs on the RMX-44 and RMX-62 will be
muted.
ADDITIONAL CONTROL PORT PROVISIONS
SYSTEM MUTING
Closing a circuit between Pin 4 and common will
mute all channels. Muting will remain in effect as
long as the contact is close.
Muting may be desired during some paging opera-
tions or activated as an override function of a fire
alarm to kill background music, etc.
An external delay circuit may also be employed
to activate the MUTE function in order to lengthen
the two-second RMX-44/62 factory-set power-up
delay.
LOW VOLTAGE DC SUPPLY
Pins 13 and 25 are identical, paralleled DC outputs
providing +14 VDC at 50 mA. This supply may be
utilized to power LED indicators, etc.