# Reading registers from electricity meters with modbus

**URL:** <https://discourse.nodered.org/t/reading-registers-from-electricity-meters-with-modbus/91168>\
**Category:** General\
**Tags:** modbus, read\
**Created:** [21 September 2024 15:38 UTC](https://discourse.nodered.org/t/reading-registers-from-electricity-meters-with-modbus/91168 "2024-09-21T15:38:38Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![LWfromPY](https://avatars.discourse-cdn.com/v4/letter/l/4bbf92/32.png) [@LWfromPY](https://discourse.nodered.org/u/LWfromPY)\
**Post date:** [21 September 2024 15:38 UTC](https://discourse.nodered.org/t/reading-registers-from-electricity-meters-with-modbus/91168/1 "2024-09-21T15:38:38Z")

</div>

Hello everyone,

I need help with the following issue.

I am trying to read data from a Modbus (RTU) electricity meter with a Raspberry Pi.

So far everything is working fine, I can read almost all values, but I am having problems with the data that starts with high byte 4. I cannot read this data.

Parser nodes are not helpful here, I can display or put the data together, the problem starts earlier when I trying to read from the meter.

Can anyone tell me how I can pass the register addresses to the Modbus node so that I can read the correct data?

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/2/1/21acd03600e7fa9831b83a59566d3fba49dc9f3a.png)  
 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/8/681a2ace019721092434a51bf001b4804e8164d8.png)

In the pictures you can see the extract from the Modbus protocol, I am trying to read the data point (Total import active energy - kWh) that I have marked in red.

This is the first one that starts with high byte = 04. I can read all the data before that without any problems because I specify the address from the low byte.

If anyone can help me to solve this, I would be very grateful.

Here is my flow:

```auto
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        "tcpType": "DEFAULT",
        "serialPort": "/dev/ttyAMA0",
        "serialType": "RTU",
        "serialBaudrate": "9600",
        "serialDatabits": "8",
        "serialStopbits": "1",
        "serialParity": "none",
        "serialConnectionDelay": "100",
        "serialAsciiResponseStartDelimiter": "0x3A",
        "unit_id": 2,
        "commandDelay": 1,
        "clientTimeout": 1000,
        "reconnectOnTimeout": true,
        "reconnectTimeout": 2000,
        "parallelUnitIdsAllowed": true,
        "showErrors": false,
        "showWarnings": true,
        "showLogs": true
    }
]

```

---

<div class="post-metadata">

**Author:** ![craigcurtin](https://avatars.discourse-cdn.com/v4/letter/c/94ad74/32.png) [@craigcurtin](https://discourse.nodered.org/u/craigcurtin)\
**Post date:** [22 September 2024 22:33 UTC](https://discourse.nodered.org/t/reading-registers-from-electricity-meters-with-modbus/91168/2 "2024-09-22T22:33:38Z")

</div>

WIthout Importing your Flow

04x00 (Hex) transtlates to 1024 in Decimal

Are you specifiying Hex or decimals registers when making the call ?

Its quite unusual for meters (although a lot of chinese manufacturers do not follow norms) to start at register Zero - usually they are in the 3000 or 30000 range

Can you post a picture of the modbus flexgetter config ?

Craig

---

<div class="post-metadata">

**Author:** ![LWfromPY](https://avatars.discourse-cdn.com/v4/letter/l/4bbf92/32.png) [@LWfromPY](https://discourse.nodered.org/u/LWfromPY)\
**Post date:** [22 September 2024 23:53 UTC](https://discourse.nodered.org/t/reading-registers-from-electricity-meters-with-modbus/91168/3 "2024-09-22T23:53:46Z")

</div>

Hello Craig,

thanks so much for the answer.  
1024 was the correct setting. Now is working and I understand much more about Modbus.

Here is the Flex Getter setting.

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/5/659e16a93b1ef13bc8cd16d923f2dd37d1c3a512.png)

Agian, thanks a lot.

Have a nice week.

Luis

---

<div class="post-metadata">

**Author:** ![craigcurtin](https://avatars.discourse-cdn.com/v4/letter/c/94ad74/32.png) [@craigcurtin](https://discourse.nodered.org/u/craigcurtin)\
**Post date:** [23 September 2024 02:19 UTC](https://discourse.nodered.org/t/reading-registers-from-electricity-meters-with-modbus/91168/4 "2024-09-23T02:19:51Z")

</div>

Excellent thanks for letting up know - please mark as the solution so others can find it if required

Craig

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [7 October 2024 02:20 UTC](https://discourse.nodered.org/t/reading-registers-from-electricity-meters-with-modbus/91168/5 "2024-10-07T02:20:40Z")

</div>

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