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 LEDS 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. More information on the GPS antenna can be found Here.
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. More information on these units can be found Here