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OM20 Universal Outdoor Modem
5.1.1 Power Input
5.1.1.1
AC Power Input (J1)
AC Input is located on connector J1 of the OM20. The auto-ranging universal power supply
input allows for the connection of AC power to the port between the range of 100 – 240 VAC and
50 – 60 Hz. Power consumption for the unit is 1A (OM20) only. For the OM20, add the
applicable BUC current draw to the OM20 current draw to insure that sufficient current is
available for the system. An external chassis ground post is located on the OM20 (J6 GND)
using a #10-32 threaded stud (Note: this is for external grounding, and should not be used to
ground the AC power Source on J1). A mating power connector is supplied as standard with the
unit. An optional AC power cable assembly can be ordered with the unit. This cable assembly
will include up to 25 feet of 14 AWG SO Cable, terminated with the mating AC power input
connector on one end. Refer to Table 5.2 for the connector Pinout.
5.1.1.2
DC Power Input/Switch (Optional)
An Optional DC Power Input is available for the OM20. The unit may be powered from a 44 –
56 VDC source with a maximum unit power consumption of 5-2 A. This port is a 4-pin
(D38999/24FC4PN) connector (mating connector supplied with the unit). Refer to Table 5.2A
for the connector pinout.
5.1.2 Remote/Terminal/Fault Port (J2)
This port functions as the OM20 Remote, Terminal, and Fault port utilizing an 18-Pin
D38999/24FD18PN Connector (mating connector supplied with the unit). This port supports an
asynchronous control protocol further described in Section 6 for Remote and Terminal operation.
It may be used to support either RS-232 (Terminal) or RS485 (Remote) signal levels. The port is
intended for use in computer-based remote Monitor and Control (M&C). All functions of the
OM20 may be monitored and controlled from this port via a common terminal connection to the
Terminal interface, or an M&C connection to the Remote interface. Selection of the port
MN-OM20– Revision 5
Table 5-2. AC Power
A
Line (L1)
B
Neutral (L2)
C
Ground
Table 5-2A. DC Power
A
– VDC
B
+ VDC
C
Ground
D
N/C
Rear Panel Interfaces
5–3
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