DLMS Modem Configuration (Class 45 - Auto Connect & Auto Answer) over 4G/NB-IoT
-
Setting up Cellular Modems via COSEM Class 45 & Class 47
Internal 4G/NB-IoT smart meter modems use Class 45 (
Auto Connect) and Class 47 (GSM Diagnostic) for autonomous network registration.Key Configuration Objects
0.0.2.1.0.255(Auto Connect): Controls connection trigger (e.g. Periodic, On-Alarm, On-PowerUp).0.0.25.4.0.255(GPRS Modem Setup): Holds APN string (e.g."iot.smartgrid.net"), PIN code, and authentication credentials.0.0.25.6.0.255(GSM Diagnostic): Exposes real-time signal strength (RSSI, RSRP, RSRQ), Cell ID, and operator code.
Reading
0.0.25.6.0.255during site installation allows field engineers to instantly check 4G signal quality directly via optical probe! -
GSM Diagnostic RSSI mapping: Values 0-31 map to $-113\text{ dBm}$ to $-51\text{ dBm}$ ($2\text{ dBm}$ per step). Value 99 indicates unknown or undetectable signal.
-
In the modem driver, we configure automatic APN fallback if the primary APN fails DNS resolution after 3 connection attempts.
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login