DRC 242-A 2007-08-03 Page 20 DC3 with SEM Installation Instructions
* * * These procedures apply only to DC3 Video Event Recorders * * *
If the OUT switch on the UM05 is set to NORM LO, the output switch will be open all the time unless an
event has been triggered in the DriveCam Event Recorder. When an event is triggered, the output switch
will close for about 1 second. When that is complete, the switch will open again. If the OUT switch is set
to NORM HI the switch will work in the opposite way (i.e. closed normally, open when an event is
triggered).
Wiring Options
There are many ways the output of the UM05 can be used. The following section shows some sample
applications. Your particular application will determine the actual wiring configuration. These examples
should only be considered a general guide.
Example 1: Triggering a GPS or other electronic device
Generally, it is very easy to connect your UM05 to trigger a GPS or other electronic device. These types
of devices typically require voltage levels but very low current. The yellow wire is connected to +12V so
that the voltage at the blue wire will go up whenever the switch opens. When the switch is closed the
voltage at the blue wire will be low. The yellow wire can be tied to a constant or switched voltage source.
When tied to a constant voltage source there will be approximately 0.007A (7mA) of current drawn at all
times. If the yellow wire is tied to a switched voltage source, the voltage at the blue wire will never go up
when the switched voltage source (i.e. ignition switch) is off.
Table 1 shows the UM05’s approximate output level of the blue wire for an event recorder during an event
or during normal, non-event operation. If the GPS requires the voltage to go high to trigger it, set the
UM05’s OUT switch to NORM LO. If the GPS requires the voltage to go low to trigger, set the switch to
NORM HI. If the GPS setting is selectable a NORM LO setting should typically be used.
NOTE: With the yellow (supply) wire connected to a switched voltage source and the
UM05’s OUT switch set to NORM HI, the blue wire will go low whenever the voltage
is turned off even though there is no event.
UM05 Switch Setting
Norm Lo Norm Hi
DriveCam Event (DC3) High* 0V
No Event 0V High*
These settings apply only to DC3 Video Event Recorders
High = 12V – 24V
TABLE 1 VOLTAGE LEVEL AT THE BLUE WIRE
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