NavSpark PX1172RDP-EVB Getting Started page 7

Interface of RTK/DR EVB (3/3)
NAME
SW1
TIMEPULSE
Jumper G/H, E/F
VCC33
RF_IN1
DIR
SPD
Push button for manual reset to the module
One-pulse-per-second (1PPS) time mark output, 3.3V LV-TTL. The rising
edge synchronized to UTC second when getting 3D position fix. The pulse
duration is about 100msec at rate of 1 Hz.
Jumper G/H, E/F must be short for normal use.
3.3V power output for external device when USB_1 connects to laptop,
or 3.3V power input for EVB when USB_1 is not used
RF input #1
RTK Position: RF_IN1 antenna position
Forward or reverse direction input from vehicle.
Reverse (HIGH > 2.0V), Forward (LOW < 0.8V), max input 36V
Car speed pulse input, frequency < 4kHz.
LOW < 0.8V, HIGH > 2.0V, max input 36V.
DESCRIPTION