11 Event Marker Input and 1PPS Output
72 Trimble R6/R7 GPS and Trimble R8 GNSS Receivers User Guide
Trimble R7 GPS Receiver Operation
11.1Event marker input
Use event marker input to log a precise GPS time tag whenever an externally generated
pulse is received, such as one generated at the time of the shutter closing from a
photogrammetric camera.
The event is triggered when the source pulse voltage transitions between 1.0 V DC and
2.0 V DC in less than 100 nsec. Trimble recommends that you use TTL level inputs. You
can configure the receiver to recognize either a positive (rising) or negative ( falling)
voltage as the leading edge of a pulse. The accuracy of the associated time tag recorded
for an event is determined by the GPS accuracy (typically less than 1 μsec.).
The Trimble R7 GPS receiver records each event in the current data file. This record
includes the port on which the event was received.
111.1 Enabling and configuring event marker input
To enable or configure the event marker input function, you need the GPS
Configurator software.
In real time
You can use the GPS Configurator software to configure a Trimble GPS receiver
connected to your office computer. For more information, see The GPS Configurator
software, page 50, or refer to the GPS Configurator Help.
To enable event marker input:
1. Connect the computer to the Trimble R7 GPS receiver.
2. Press
[P] to turn on the receiver.
3. To start the GPS Configurator software, click and then select
Programs / Trimble / GPS Configurator / GPS Configurator. The GPS Configurator
dialog appears and the software automatically connects to the Trimble R7 GPS
receiver.
4. In the General tab, select the Event marker check box.
5. Select the appropriate option, Positive slope or Negative slope, depending on the
type of pulse the external device uses.
6. Click
Apply.
The GPS Configurator software sends the new configuration information to the
receiver, and the receiver starts to accept event marker input.
7. Click
OK to exit the GPS Configurator software.
The software disconnects from the receiver.
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