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8
SS 4.1 MLR/RJ Installation and Operation Manual
OPERATION
Open Collector and Silence Sense Relay Outputs
The SS 4.1 MLR/RJ 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 status
open collector (OCx) output for the selected channel will go low to ground (GND)
providing a return for an LED indicator, TTL/CMOS logic or relay. External pull-up
resistors may be required in some installations. In addition to the open collector out-
puts located on TB3, the SPDT silence sense alarm relay contacts are also present,
labeled SS-NC (normally closed), SS-NO (normally open) and SS-CM (common.)
(Top row, TB3)
Open Collector/Silence Sense Relay Outputs
OC1
OC2
OC3
OC4
SSNC
SSNO
SSCM
GND
See Above
(Bottom Row, TB3)
RS-232 Serial Port (RJ-11 Jack):
This RJ-11 jack is used to connect the SS 4.1 MLR/RJ to a computer’s COM port for
RS-232 serial operation using the included reverse modular cable with 9-pin “S9”
female D-sub adapter. If your PC does not have a built-in RS-232 serial port but does
have USB, then a USB-to-serial adapter cable is a good way to add serial capability.
We recommend USB-to-serial adapter cables that use the FTDI chipset and have had
good results with the model “SBT-FTDI” from Sabrent.
CAUTION!
Installation of the SS
4.1 MLR/RJ in high RF
environments should be
performed 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 fraction-
al schematic in the
appendix.
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