NavCom SF-2110 Rev.C - Manual (Page 32)

SF-2110 User Guide – Rev. C
The GPS sensor is protected from reverse polarity
with an inline diode. It will operate on any DC voltage
between 9 and 36 VDC, 5 watts (maximum).
‡
Voltages less than 9VDC will turn the
unit off. To turn the unit on, power
must be in the 9 to 36 VDC range.
Press and hold the I/O switch in for
more than 3 seconds.
Voltages in excess of 36VDC will
damage the unit. The power supply
must be well conditioned with surge
protection. Vehicular electrical systems
which create voltage spikes in excess
of 36VDC will benefit from providing
power protection during vehicle engine
power-up. This can be accomplished
through a relay power-on sequence
and/or power conditioning (such as a
DC to DC converter). Do not connect
equipment directly to the vehicles
battery without in-line protection (such
as a DC to DC converter).
Functionality Rules: Interaction of Front
Panel On/Off Switch & Ignition Pin
9
If the unit is powered off from the front panel
On/Off switch (see Figure 5):
• Applying +7VDC or greater to the
Ignition pin (see Figure 4) turns the
unit on
• Removing power from the Ignition pin
turns the unit off
9
If the unit is turned on from the front panel On/Off
switch, the Ignition pin is over-ridden and will not
function.
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* Consult Release Notes on the NavCom web site for availability.