Satel SATELLINE-M3-R3 Guía de usuario Pagina 11

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SATELLINE-M3-R3
Integration Guide, Version 1.6
10
16
GPIO9
CMOS/BIDIR
GPIO not used
17
SERVICE
IN
Input for service access. Internally pulled high.
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 1 MHz…20 MHz input.
Generally from a GPS receiver clock. Used for
reference frequency synchronization.
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