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13 Event Marker Input and 1PPS Output
142 5700 GPS Receiver User Guide
Reference
13.1Introduction
The 5700 receiver can accept event marker input on Port 1 and Port 2,
and can generate 1PPS output on Port 2.
13.2Event Marker Input
Event marker input is used to log a precise GPS time tag whenever an
externally generated pulse, such as one generated at the time of the
shutter closing from a photogrammetric camera, is received.
The event is triggered when the source pulse voltage transitions
between 1.0 VDC and 2.0 VDC 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 5700 receiver records each event in the current data file. This
record includes the port on which the event was received.
13.2.1 Enabling and Configuring Event Marker Input
To enable or configure the event marker input function, you need
either the GPS Configurator software or the Configuration Toolbox
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 GPS Configurator Software, page 66, or refer to the
GPS Configurator Help.