User guide

SATELLINE-M3-R3
User Guide, Version 1.2
10
Pull low / drive low to set UART1 (RD1,TD1) into
known state. See separate section of manual.
18
GPIO11
CMOS/BIDIR
GPIO – not used
19
PPS
CMOS/IN
Pulse per second input. A CMOS input for pulse
per second signal output from GPS receivers.
Intended to sync time and frequency of receiver
to other radios.
20
REF_FREQ_IN
CMOS/IN
Frequency input. A 1MHz…20 MHz input.
Generally from a GPS receiver clock. Used for
reference frequency synchronization.