Trimble Inc. 5940071-B1 用户手册

11     Event Marker Input and 1PPS Output

72     Trimble R6/R7 GPS and Trimble R8 GNSS Receivers User Guide

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.

To enable or configure the event marker input function, you need the GPS 
Configurator software.

You can use the GPS Configurator software to configure a Trimble GPS receiver 
connected to your office computer. For more information, see 

, 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 

.

The GPS Configurator software sends the new configuration information to the 
receiver, and the receiver starts to accept event marker input.

7.

Click 

 to exit the GPS Configurator software. 

The software disconnects from the receiver.