Specifications

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7
SS 4.1 MLR Installation and Operation Manual
INSTALLATION
In remote control mode the inputs are triggered by momentary closure to (pulsing)
to ground (low.) For example, pulsing the “MUTE” input to ground would turn off
the output of the SS 4.1 MLR until a front panel source switch is pressed, a differ-
ent remote control input is activated, the unit is powered up and/or a serial command
is received from a PC or other serial device.
Pulsing the “STEP” input to ground will step the unit one source for each low to high
transition on this input. Automatic timed sequencing may be accomplished by hold-
ing the step input low. The unit will now step to each source at a user programma-
ble rate from 1 to 99 seconds (10 seconds by default). The last step channel is user
programmable and is set to 4 by default. This feature may be used to sequence
through multiple station air monitor signals for a program on-hold feed.
The SS 4.1 MLR is also capable of being used for EAS audio insertion. This feature
is enabled by setting the EAS controlled input channel via RS232 to the desired
audio input channel (see the Serial Operation section of this manual for more infor-
mation.) Once an input channel has been designated the SS 4.1 MLR will automat-
ically switch to that input for the duration of a sustained closure to ground on the
“PIP8/EAS” remote control input. When an EAS controlled input channel is con-
figured PIP8 is disabled.
Open Collector Outputs
The SS 4.1 MLR has four open collector outputs that are used to indicate channel
selection status. OC1 indicates for Input 1, OC2 indicates for Input 2, etc. The sta-
tus open collector (OCx) output for the selected channel will go low providing a
return for an LED indicator, TTL/CMOS logic or relay. External pull-up resistors
may be required in some installations.
See Above
(Top row, TB3)
OC1 OC2 GND OC3 OC4
Open Collectors
(Bottom Row, TB3)
CAUTION! Installation of the SS 4.1 MLR in high RF environments should be per-
formed with care. The station ground should be connected to the designated chassis
ground terminal using a 20 to 24-gauge wire.
Note: For wiring information, refer to the grids in this section of the manual,
the silk-screen text on the rear panel of the product or the fractional schematic
in the appendix.
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