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LEDR Series I/O Guide
MDS 05-3627A01, Rev. D
Input Connections
In addition, four external alarm input lines (Pins 1, 2, 3 & 4) are pro-
vided. Normally, the input is either left open or shorted to ground, to
indicate an alarm condition.
Each alarm input is diode-clamped to +3.3 Vdc or chassis ground, and
can tolerate inputs from -4 to +6 Vdc without drawing excessive current.
If left open, each input is pulled up. To indicate an alarm condition, short
the input pin to the ground provided on the alarm connector (Pin 5). The
maximum DC loop resistance is 2 K
Ω
. These alarm input lines can tol-
erate circuit “bounce” common with mechanical relays.
NOTE:
The normal (unalarmed) state of the contacts (open or closed)
or input alarm state (high or low) can be selected by a software
subcommand.
Alarm Events
The events that cause alarm output signals can be configured in the radio
software.
for information on programming
which events trigger an alarm.
for Alarm I/O pinout information.
DC Power Input (Primary Power)
The
DC POWER INPUT
connector is a three-pin keyed connector used to
connect an external DC power source. A label next to the power con-
nector indicates the nominal voltage of the radio.
lists the actual
operating voltage ranges.
The connector matches with a power plug (MDS Part No. 73-1194A22)
which contains binding posts for attaching the positive and negative
power leads. The polarity of the power connections does not matter; the
positive and negative leads may be connected to either the left or right
binding posts as shown in
. The center con-
ductor is not connected in the LEDR chassis and should be left unwired.
Before connecting primary power to the radio, verify that the source
provides a voltage within the proper operating range. Improper voltages
may damage the equipment. Permissible voltage limits are shown in
.
Table 9. Primary Power Input Options
Nominal Voltage
Operating Range
24 Vdc
19.2 to 28.8 Vdc
48 Vdc
38.4 to 57.6 Vdc
CAUTION
PPP
POOOOSSSSSSSSIIIIBBBBLLLLEEEE
EEE
EQQQQUUUUIIIIPPPPMMMMEEEENNNNTTTT
DDD
DAAAAMMMMAAAAGGGGEEEE
CAUTION
POSSIBLE
EQUIPMENT
DAMAGE