Changing RegisterOrder doesn't affect the value

[Jordise2002]

In the edit item(s) panel in the advanced section changing the register order doesn't affect the value. I am testing using a UDec64 item on the HoldingRegisters of a Modbus TCP connection. Changing those parameters on the device didn't change anything either.

The .pjc file is appended bellow:

<?xml version="1.0" encoding="UTF-8"?>
<project version="0.4.6" editnum="4">
    <name>ModbusSlave</name>
    <author>ralcaraz</author>
    <comment>ModbusSlave - /home/ralcaraz/Project - 2026-01-14_10-58-38</comment>
    <ports>
        <port>
            <stopBits>1</stopBits>
            <dataBits>8</dataBits>
            <timeoutFirstByte>1000</timeoutFirstByte>
            <serialPortName></serialPortName>
            <flowControl>No</flowControl>
            <isBroadcastEnabled>true</isBroadcastEnabled>
            <baudRate>9600</baudRate>
            <name>ModbusSlave</name>
            <timeoutInterByte>50</timeoutInterByte>
            <host>192.168.2.20</host>
            <parity>No</parity>
            <maxconn>10</maxconn>
            <type>TCP</type>
            <port>5002</port>
            <timeout>3000</timeout>
        </port>
    </ports>
    <devices>
        <device>
            <byteArrayFormat>Hex</byteArrayFormat>
            <byteArraySeparator>\[default]</byteArraySeparator>
            <byteOrder>LessSignifiedFirst</byteOrder>
            <maxReadCoils>2040</maxReadCoils>
            <maxReadDiscreteInputs>2040</maxReadDiscreteInputs>
            <maxReadHoldingRegisters>127</maxReadHoldingRegisters>
            <maxReadInputRegisters>127</maxReadInputRegisters>
            <maxWriteMultipleCoils>2040</maxWriteMultipleCoils>
            <maxWriteMultipleRegisters>127</maxWriteMultipleRegisters>
            <name>Escritura Holding Múltiples Completos Contiguos</name>
            <portName>ModbusSlave</portName>
            <registerOrder>R0R1R2R3</registerOrder>
            <stringEncoding>UTF-8</stringEncoding>
            <stringLengthType>ZerroEnded</stringLengthType>
            <unit>1</unit>
        </device>
    </devices>
    <dataviews>
        <dataview name="Dataview" period="500">
            <addressNotation>Default</addressNotation>
            <useDefaultColumns>1</useDefaultColumns>
            <columns>Device;Address;Format;Comment;Value</columns>
            <item>
                <device>Escritura Holding Múltiples Completos Contiguos</device>
                <address>400301</address>
                <byteArrayFormat>Hex</byteArrayFormat>
                <byteArraySeparator>[default]</byteArraySeparator>
                <byteOrder>MostSignifiedFirst</byteOrder>
                <comment>W_A_HOLD_C1</comment>
                <format>UDec64</format>
                <period>500</period>
                <registerOrder>R3R2R1R0</registerOrder>
                <stringEncoding>DefaultStringEncoding</stringEncoding>
                <stringLengthType>ZerroEnded</stringLengthType>
                <value>0</value>
                <variableLength>20</variableLength>
            </item>
            <item>
                <device>Escritura Holding Múltiples Completos Contiguos</device>
                <address>400305</address>
                <byteArrayFormat>Hex</byteArrayFormat>
                <byteArraySeparator>[default]</byteArraySeparator>
                <byteOrder>MostSignifiedFirst</byteOrder>
                <comment>W_A_HOLD_C2</comment>
                <format>Dec32</format>
                <period>500</period>
                <registerOrder>R0R1R2R3</registerOrder>
                <stringEncoding>DefaultStringEncoding</stringEncoding>
                <stringLengthType>ZerroEnded</stringLengthType>
                <value>0</value>
                <variableLength>20</variableLength>
            </item>
            <item>
                <device>Escritura Holding Múltiples Completos Contiguos</device>
                <address>400307</address>
                <byteArrayFormat>Hex</byteArrayFormat>
                <byteArraySeparator>[default]</byteArraySeparator>
                <byteOrder>LessSignifiedFirst</byteOrder>
                <comment>W_A_HOLD_C3</comment>
                <format>Double</format>
                <period>500</period>
                <registerOrder>R3R2R1R0</registerOrder>
                <stringEncoding>DefaultStringEncoding</stringEncoding>
                <stringLengthType>ZerroEnded</stringLengthType>
                <value>0</value>
                <variableLength>20</variableLength>
            </item>
            <item>
                <device>Escritura Holding Múltiples Completos Contiguos</device>
                <address>400311</address>
                <byteArrayFormat>Hex</byteArrayFormat>
                <byteArraySeparator>[default]</byteArraySeparator>
                <byteOrder>LessSignifiedFirst</byteOrder>
                <comment>W_D_HOLD_C4</comment>
                <format>Bool</format>
                <period>500</period>
                <registerOrder>R0R1R2R3</registerOrder>
                <stringEncoding>DefaultStringEncoding</stringEncoding>
                <stringLengthType>ZerroEnded</stringLengthType>
                <value>0</value>
                <variableLength>20</variableLength>
            </item>
            <item>
                <device>Escritura Holding Múltiples Completos Contiguos</device>
                <address>400312</address>
                <byteArrayFormat>Hex</byteArrayFormat>
                <byteArraySeparator>[default]</byteArraySeparator>
                <byteOrder>LessSignifiedFirst</byteOrder>
                <comment>W_D_HOLD_C5</comment>
                <format>Dec16</format>
                <period>500</period>
                <registerOrder>R3R2R1R0</registerOrder>
                <stringEncoding>DefaultStringEncoding</stringEncoding>
                <stringLengthType>ZerroEnded</stringLengthType>
                <value>0</value>
                <variableLength>20</variableLength>
            </item>
        </dataview>
    </dataviews>
    <windows>0c0000006461743a44617461766965770a000000000000000000000075060000de020000</windows>
</project>

Thanks for your work

[serhmarch]

Hello.

I can not identify the same issue, currently all is working fine:

I have 4 sequential registers [400001:400004] with values 0000 1111 2222 3333 (Hex format), then 4 Hex64 values with different registers order, then 4 UDec64 with the same order.

I recommend to use the latest version 0.4.8 (as I see you use 0.4.6)

[Jordise2002]

Doing further testing I found the issue to be non-consistent. Some times I found that with the same project it worked and suddenly it stopped working after doing some modifications I can't exactly pin down.