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oMG 500 Installation Guide
3.2.3.
Orientation
Install the oMG 500 so that the rear panel faces away from the equipment storage opening. This
provides the most protection to the cable connections and any antennas on the rear panel.
In a typical installation, the system powers on automatically when the vehicle ignition switch is on, and
shuts down automatically when the ignition switch is off. Therefore, you do not normally use the
Power Reset button on the rear panel in such an installation. If you need to perform a manual power
up or power down, the clearances specified in Section 3.2.2 will ensure adequate access to the power
button.
Note:
If the oMG 500 will be mounted on a vertical surface, it must be mounted with the antenna
connectors facing down or to the side and not facing up.
3.2.4.
Power Connection
The oMG 500 requires a 12V DC or 24V DC power source. In most installations, you use one of the
following sources:
•
The main battery of the vehicle; power to the oMG 500 is switched by the vehicle ignition switch.
•
A separate 12V DC or 24V DC battery that powers other special equipment in the vehicle; power
to the oMG 500 is switched by the master switch of this power system.
Note:
in most contexts, this manual refers only to the case of connecting the system to the vehicle battery
and switching power with the ignition switch. You can interpret this instead to mean the separate
battery and its master switch.
While the vehicle ignition is off, the oMG 500 is in sleep mode and draws less than 2 mA of current.
When the ignition is turned on, the system starts its power-up sequence. When the ignition is turned
off again, the system performs its controlled shutdown sequence before it resumes its sleep mode.
Connect one end of the oMG 500 power cord to the 12V DC or 24V DC power source and the other
end to the POWER port on the rear panel of the base unit. The following subsections provide the
details.
3.2.4.1.
Connecting to the Power Source
Table 3 identifies the three wires in the oMG 500 power cable.
Table 3 - Wires in the Power Cord
Wire Color
Red
Black
White
When you connect the oMG 500 power cord to the 12V/24V DC power source, ensure that the
connection has the proper polarity. Connect to the power source as shown in below.
oMG-ED-130507
Purpose
+V supply (12V/24V DC). This line includes a 2.5 A
fuse.
0 V return
Ignition switch (+12V/24V for operation, 0 V for
standby)
Rev 1.2
Installing the oMG in a Vehicle
October 2, 2015
16
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