Chapter 7 • Sensor Inputs
This chapter covers sensor input requirements and functionality, including power, PPS, and Ethernet. It also covers scen-
arios for obtaining GPS input.
7.1 Power Requirements
38
7.2 Interface Box Signals
39
7.3 Ethernet Interface
40
7.4 GPS, Pulse Per Second (PPS) and NMEA GPRMC Message
40
7.4.1 GPS Input Signals
40
7.4.2 Electrical Requirements
40
7.4.3 Timing and Polarity Requirements
40
7.4.4 GPS Connection Scenarios
43
7.4.5 NMEA Message Formats
46
7.4.6 Accepting NMEA Messages Via Ethernet
48
7.1 Power Requirements
Power requirements are detailed in Chapter 5:
Power on page 29
.
38 VLS-128 User Manual
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