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Appendix A:
Installation of the MARCUS PTO/Door Sensor
The MARCUS
®
PTO/Door Sensor is used to gather PTO (Power Take Off) or Door (Door
Open/Close) information from a vehicle. These events are recorded, and then transferred
wirelessly to the Discrete Wireless Gateway and can be viewed through the MARCUS
®
Web
Application.
The sensor can be wired to any +12-volt or -12 volt DC line that powers on and off along
with the desired event. This wire can either be a 12v+ or 12v- trigger. When a vehicle’s
PTO is engaged, or the door is open, the current on the + or - 12-volt DC wire completes
a circuit and sends a message through the MARCUS
®
3G Radio Module. When the event is
finished, and the + or - 12-volt DC wire loses power, a second message is sent signaling
the end of the event.
All sensors need to be installed with a relay in line
to ensure proper operation.
(NOTE: Before installation of the MARCUS
®
sensor, Discrete Wireless Customer Service
must be contacted to enable the sensor on the application. Please contact Discrete
Wireless at customersupport@discretewireless.net
or call 678-338-5955. Please be
prepared to supply the type of sensor install, (PTO or Door) and the Min # of the
MARCUS
®
unit the sensor will be used with.)
Connecting an Auxiliary device to the Marcus unit:
The Marcus device can be ordered with the Power Sensor Cable (PSC) if the customer
needs to monitor an auxiliary device such as a PTO, Rear door, etc. The Marcus unit will
accept 3 sensor inputs in addition to the Ignition input. The PSC will include 2-4 wires in
addition to the Black, Red, and White. An Orange, Green, Blue Brown or Grey wire will be
installed in to the harness for the auxiliary input. Depending on the type of Auxiliary
device you will be connecting the Marcus unit you will either a POSITIVE trigger or a
NEGATIVE trigger when the Auxiliary device is activated.
Do I have an Auxiliary device?
There are many different types of auxiliary devices that can be connected to the Marcus
unit to capture an event. Many of these devices will be activated by the driver of the
vehicle to perform some type of action using the vehicle, such as a PTO (Power Take Off)
on a Tow truck or the sweeping device on a Street Cleaning truck. Other auxiliary devices
may be installed by a technician at the time of the Marcus installation in order to capture
other types of important information. One of the most common add on auxiliary devices is
a Rear Door sensor (RDS). RDS are used to capture data when the rear door on a vehicle
such as a box truck is opened.
Do I have a Positive or Negative trigger?
An Installation tech can determine what type of polarity your auxiliary device has by using
a digital multi meter to test the auxiliary device when it is engaged.
Positive: It has been determined that the auxiliary device has a positive trigger. The
ORANGE wire on the PSC will need to be connecter to the wire that is +12 volts then the
auxiliary device is activated. One important thing to do when connecting a Positive trigger
is to put an inline 3 amp fuse on the Orange wire between the Marcus unit and the
auxiliary device. The fuse will need to be located as close to the auxiliary device as
possible.
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