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Connection: The
connections to the EYTraker unit will be discussed in detail: In order to provide power
and other connections from the outside world.
The above diagram details the front view of
the tracker unit. The functions of the four LED’S can be found in the User's Manual,
download it from Here. The 9
pin Serial connection provides the necessary connection to a PC, external radio or unit
that can decode NMEA strings for secondary use. The toggle switch selects the NMEA string relay
ON, in the upwards position as indicated. This makes the NMEA strings: $GPGGA, $GPRMC,
$GPGSA, $GPZDA and $GPVTG available at the preset baud rate, as selected in the
configuration software (See Paragraph 3.7) via the RS232 TX pin. When the NMEA string
relay function is active the unit cannot be programmed or bootloaded. The RS232 connector
conforms to the RS232 international accepted pinout configuration. By switching the toggle switch to the OFF
position, the unit is made available for Configuration upload, download and bootloading. The 3-pin power connector is located below
the RS232 connector.
The two pins closest to the locating notch at
the top, are both Positive supply connectors accepting voltages from 7 to 15 V DC. A
reverse polarity protection diode is provided for on the PC Board. Although the protection
diode is present, please ensure correct polarity at all times to protect the sensitive
circuitry. The single pin, located at the bottom, functions as the Ground or Negative
supply pin. The back view of the EYTraker unit contains
the RF connections.
The SMA female bulkhead connections are
provided as indicated. Closest to the heatsink is the GSM or Cell phone antenna. (SMA
connector). This connector will accept any dual band GSM antenna terminated in a male SMA
connector. In order for the unit to function on both the 900 MHz and 1800 MHz GSM bands,
the use of a dual band antenna is recommended. Both the “rubberduck” or window The GPS SMA Female bulkhead connector requires
an active GPS antenna with a supply voltage of 3V. The unit will not function with a passive GPS antenna. The
location of the antenna should be with a reasonable clear view of the sky, to provide the
necessary GPS coverage for accurate navigation. The onboard GPS engine has proven to be very
sensitive in urban canyons and limited coverage areas, but the user must try to ensure a
reasonable clear view of the sky. All units are provided with either a uBlox
RCB-LJ 16 channel GPS engine or a Telit GPS/GSM combo unit. Please refer to the
specification section of this document for more information on the installed OEM units.
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