Cannot connect to HDPM6000 after erroneously setting subnet mask 255.255.255.255

[rcamacker]

Commissioning new HDPM6000. Updated firmware. Set client's requested IP but typo'ed 255.255.255.255 as the subnet mask. Cannot ping, open webpage, Modbus will not connect, no HDPM6000 Manager access. NetCfg can read the address but cannot change it as the firmware of the meter is too new.

Is there any way to change the submask remotely or otherwise connect to the meter?

[Mehran_Mehrnia]

Hi @rcamacker 

The subnet mask of 255.255.255.255 likely has isolated the device from all other devices on the network.

Here are some steps that could help to resolve it:

1- If possible, connect your laptop directly to the meter using an Ethernet cable and assign a static IP address to your computer that is in the same subnet as the meter’s original configuration.

For example, if the meter was previously set to 192.168.1.x, set your computer to 192.168.1.10 and try to connect.

2- You mentioned 'Modbus will not connect' and I assume via Modbus TCP, but have you tried connecting serially to the device via a gateway or USB/Serial converter to read the Modbus registers from 4481 using any Modbus application to read the configured/saved IP address and subnet mask of this meter and try to edit them accordingly? 

In this example, I connected through Modbus(in my case via TCP) and wrote the values 255,255,0,0 to the registers 4489-4491:

 

By default serial Modbus settings of HDPM6000 is as below:
Modbus Slave Address: 1
Baud rate: 115200
Parity: None

Best Regards,

-Mehran

L3 Expert Advanced metering

[rcamacker · Accepted solution]

Thanks for the reply Mehran. Once I had erroneously changed the subnet mask to 255.255.255.255 there was no way to locally connect to the meter. Nothing worked, except NetCfg. However NetCfg could not change the IP address as this firmware was up-graded on the HDPM6000 (After a certain framework NetCfg cannot change the IP address). Had to join the site network to open the webpage.

[Charles_Murison]

Hello @rcamacker ,

Likely when you connected the meter to the network, the meter was able to route traffic through the gateway address.

regards,

Charles