[LinuxPPS] PPS - Ublox NEO-M9N

[emanuele.pasinetti at tecnowatt.com]

Good morning,

I have a problem with GPS module ( AIW-212 - Advantech) Ublox NEO-M9N in
minipci-express format, my goal is to get working chrony daemon in
combination with gpsd to synchronize my system.

 

The device is correctly recognized by OS (Debian 11) and I can trap the NMEA
messages on /dev/ttyACM0.

On system start I can see that also the PPS module is correctly installed : 

 

dmesg

[    5.294806] pps_ldisc: PPS line discipline registered

[    5.295102] pps pps1: new PPS source acm0

[    5.295109] pps pps1: source "/dev/ttyACM0" added

 

When I try to check the pps I can't see any status changing.

 

ppstest /dev/pps1

trying PPS source "/dev/pps1"

found PPS source "/dev/pps1"

ok, found 1 source(s), now start fetching data...

time_pps_fetch() error -1 (Connection timed out)

 

To verify the PPS presence (in addiction to checking the GPS mode (3D FIX)
with cgps tool) I have connected a wire soldered to the PPS signal present
on module and the DCD signal of an RS232 serial port.

If I check the PPS with ppscheck tool I think the signal is working
correctly.

 

ppscheck /dev/ttyS0

# Seconds  nanoSecs   Signals

1694124205.155059987 TIOCM_CD

1694124205.254962112

1694124206.154989656 TIOCM_CD

1694124206.255009871

1694124207.155048536 TIOCM_CD

1694124207.255041944

1694124208.155054413 TIOCM_CD

1694124208.255058004

 

Why the PPS is not visible on  "/dev/pps1" ? 

 

Thanks everyone for help

 

 

Emanuele Pasinetti

 

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