Skip to main content
Home
for DLMS smart meters
Open source solutions for DLMS smart metering

Main navigation

  • Home
  • Products
  • About us
  • Open Source
  • Community
  • Forum
  • Downloads
User account menu
  • Log in

Breadcrumb

  1. Home
  2. DLMS Communication Issue – No Response (L&T Meter Via USB Probe)

DLMS Communication Issue – No Response (L&T Meter via USB Probe)

By Chirag Kumar , 2 April, 2026
Forums
Gurux.DLMS

Dear Gurux Team,

I am facing a DLMS communication issue while connecting to an L&T energy meter using a USB probe and GXDLMSDirector.

I consistently receive the following error:
"Failed to receive reply from the device in given time."

Please find the details below:

Setup:

Tool: GXDLMSDirector
Connection: USB to Serial Probe (Optical)
Meter: Larsen & Toubro (L&T) DLMS Meter
Port Settings:COM2
Baud Rate: 300 (also tried 9600)
Data Bits: 8
Client Address: 11/16/17
Password: lnt1
Authentication: Low (also tested None)

Chirag Kumar

4 months 1 week ago

Test

Can Anyone reply on this and help me out in this

Profile picture for user Kurumi

Kurumi

4 months ago

Hi, One of your settings is…

Hi,

One of your settings is different from what your meter expects. Try to connect without authentication first (Authentication level is None).

Because you are using an optical probe, try to change the interface type to HdlcWithModeE. If you don't get a reply from the meter, change the interface type to HDLC and try with different baud rates until you can establish the connection to the meter.

BR,
Mikko

  • Create new account
  • Reset your password

Hire Us!

Latest Releases

  • Mon, 07/27/2026 - 12:37
    gurux.dlms.cpp 9.0.2607.2701
  • Thu, 07/23/2026 - 16:19
    gurux.dlms.java 4.0.96
  • Thu, 07/09/2026 - 14:34
    Gurux.DLMS.Python 1.0.201
  • Fri, 06/26/2026 - 16:32
    Gurux.Service 3.0.2606.2601
  • Wed, 06/24/2026 - 08:36
    Gurux.DLMS.Python 1.0.200

New forum topics

  • Possible memory leak in file dlms.c, getCompactArrayItem(), getCompactArrayItem2()
  • Official Gurux.DLMS.Client.Example.Net fails during High GMAC secure association (Invalid PDU), while Gurux Director connects successfully
  • gurux_dlms.GXDateTime.GXDateTime object Error in Python
  • T_APPL_DATA_LN_N1 subtest 3 fails on an LN-only server regardless of the response to a non-existing-object GET
  • Version mismatch between Gurux.DLMS 9.x and Gurux.Common/Gurux.Serial 8.x
More
RSS feed
Privacy FAQ GXDN Issues Contact
Follow Gurux on Twitter Follow Gurux on Linkedin