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11 Event Marker Input and 1PPS Output
102 Trimble R7/R8 GPS Receiver User Guide
Trimble R7 Operation
11.1 1PPS Output
The Trimble R7 receiver can output a one pulse per second (1PPS)
time strobe with an associated ASCII time tag output. The pulse is
output through Port 2 of the receiver using the event marker/1PPS
cable.
111.1 1PPS pulse definition
The leading edge of the pulse coincides with the beginning of each
UTC second, as shown in Figure 11.1. The pulse is driven by an
RS-422 driver between nominal levels of 0 V and 4 V. The leading
edge is positive, rising from 0 V to 4 V.
Figure 11.1 Time tag relation to 1PPS wave form
0V
4V
Seconds
Time tag output here Time tag applies here