Changing the minElev parameter

[praveengi113]

Hi there, I'm Praveen, I'm using the pyubx2 to interface with the UBLOX Neo M8N receiver. I'm trying to change the elevation mask of the receiver by using the below message.

cfg_nav5 = UBXMessage( "CFG", # Message class "CFG-NAV5", # Message ID mask=0x0020, # Mask indicating we're updating the minElev field dynModel=3, # Dynamic Model (portable, can be adjusted if needed) fixMode=3, # Fix mode (3D-only, adjust if necessary) minElev=mask # Minimum Elevation Mask in degrees )

With this my message is getting acknowledged by the receiver. But the value of minElev is not getting changed.

[semuadmin]

Hi @praveengi113

Can you please include your complete Python script and confirm which firmware version your M8N is running? Thanks

I can see there are a number of issues with the code snippet you've provided. I recommend having another look at the pyubx2 README, specifically the section about message generation and the message definition for the CFG-NAV5 message.

By way of comparison, here's a script that I've just successfully tested on an NEO-M8N receiver running firmware SPG 3.01 Protocol 18.00 (this arbitrarily sets the minElev value to 65 degrees - the default value is 5 degrees):

from serial import Serial
from pyubx2 import UBXMessage, SET

cfg_nav5 = UBXMessage(
    "CFG",  # Message class
    "CFG-NAV5",  # Message ID
    SET,  # msgmode must be 'SET' (0x01)
    dyn=1,  # set dynamic model mask bit
    minEl=1,  # set minimum elevation mask bit
    posFixMode=0,
    drLim=0,
    posMask=0,
    timeMask=0,
    staticHoldMask=0,
    dgpsMask=0,
    cnoThreshold=0,
    utc=0,
    dynModel=3,  # Dynamic Model (portable, can be adjusted if needed)
    fixMode=3,  # Fix mode (3D-only, adjust if necessary)
    fixedAlt=0.0,
    fixedAltVar=1.0,
    minElev=65,  # required value of minimum elevation in degrees
    drLimit=0,
    pDop=25.0,
    tDop=25.0,
    pAcc=100,
    tAcc=350,
    staticHoldThresh=0,
    dgnssTimeOut=60,
    cnoThreshNumSVs=0,
    cnoThresh=0,
    staticHoldMaxDist=0,
    utcStandard=0,
)

with Serial("/dev/tty.usbmodem1201", 38400, timeout=3) as stream:
    stream.write(cfg_nav5.serialize())

Confirmation from PyGPSClient that settings have been applied: