iSXblue/SXBlue II GNSS Series Technical Reference Manual
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2.8.3.2
Event Marker Input (EM)
Depending on your application, you may have the need to force a GPS solution at a particular instance,
not synchronized with GPS time. Such an application could be to compute the location of a perspective
center of a camera being used for a photogrammetric application, where the aircraft moves with
considerable speed and an interpolation between two GPS epochs could be unreliable.
The Event Marker input is active low 3.3V HCMOS with falling edge synchronization. The input
impedance and capacitance is higher than 10k
Ω
and 10pF respectively, with a threshold of lower than
0.7V required to recognize the input.
Upon detecting and Event, the iSXBlue/SXBlue II will output immediately the set of strings it has been
configured to output. Also it is worth noting that binary message (Bin1) has a field reserved for the event
marker. See chapter 6 for more information.
2.8.3.3
5Volt DC Output (PWR)
Some external sensor might require a 5Vdc power source. An example can be attaching an RS-232
Bluetooth or Wi-Fi dongle to the receiver. The iSXBlue/SXBlue II will supply up to 100mA to power the
external device. Care must be taken not to short-circuit this input.
2.9
Environmental Requirements
The equipment supplied with the iSXBlue/SXBlue II system has specific environmental limits that you
should ensure are met when storing and using the system.
The iSXBlue/SXBlue II receiver is designed to be stored between -40
°
C and +85
°
C. The operating
temperature range is -40
°
C and +85
°
C. Note that Li-Ion battery performance degrades below -20
°
C. The
iSXBlue/SXBlue II and antenna are designed to operate in an outdoor environment with 100% relative
humidity.
