Kamstrup electricity/heat/cold/water meters with CMe and CMi products needs extended timeout

Symptoms

When using CMe and CMi products with software version before 1.3.0, Kamstrup M-Bus meters doesn't always answer according to the M-Bus standard. The Kamstrup meter sometimes need up to 30 seconds after an SND_NKE has been sent and before it can answer a REQ_UD2 request.

Purpose

This kb describes how to change a timeout in the CMe/CMi product to work properly with Kamstrup M-Bus meters.

Resolution:

Get CMe/CMi software version

The timeout which needs to be changed is the time between the M-Bus command SND_NKE and REQ_UD2. Factory default for CMe/CMi products in version before 1.3.0 is 5000 milliseconds. In version 1.3.0, this time has been increased to 10 000 milliseconds, which normally is enough for most M-Bus meters (including Kamstrup meters).

Run following command to get the CMe/CMi version:

status ver

The software version is marked with Sw: <version>.

If version is below 1.3.0, you normally need to change the timeout.

Change the timeout using SMS or Telnet command

Run the following command to change the timeout:

2222;set common.device.mbus.nkesleep=12000

This will change the time between SND_NKE and REQ_UD2 to 12000 milliseconds, which should be sufficient.

The 2222 is the password for security level 2, and is by default set to 2222. If the password for security level has changed by the user, use the changed password for security level 2 instead.

Was this article helpful?

0 out of 0 found this helpful

Have more questions? Submit a request

Articles in this section

Comments (0 comments)

Article is closed for comments.