# Writing a 32bit Float (le) Modbus

**URL:** <https://discourse.nodered.org/t/writing-a-32bit-float-le-modbus/62026>\
**Category:** General\
**Created:** [1 May 2022 11:54 UTC](https://discourse.nodered.org/t/writing-a-32bit-float-le-modbus/62026 "2022-05-01T11:54:31Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Becker](https://avatars.discourse-cdn.com/v4/letter/b/c77e96/32.png) [@Becker](https://discourse.nodered.org/u/Becker)\
**Post date:** [1 May 2022 11:54 UTC](https://discourse.nodered.org/t/writing-a-32bit-float-le-modbus/62026/1 "2022-05-01T11:54:31Z")

</div>

Hi, I want to write one (or more) float (le) registers:

 ![grafik](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/5/6/56d2510d8ec46e19ffdd2c8a73e6d909908bfbb8.png)

for uint32(be) I know how to do (Steve told me):  
 ![grafik](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/6/7/676c2d0e6790a44ac71f9322191abddf0720fbfd.png)  
first buffer maker with uint32(be) =\> buffer parser with uint16(be) length: 2 =\> write FC16

but for float(le) there is no 32/16bit present.

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<div class="post-metadata">

**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [1 May 2022 12:00 UTC](https://discourse.nodered.org/t/writing-a-32bit-float-le-modbus/62026/2 "2022-05-01T12:00:16Z")

</div>

> [@Becker](#):
>
> float(le) there is no 32/16bit present.

Floats in JS are 32bit (AKA 2 words AKA 4 bytes)

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<div class="post-metadata">

**Author:** ![Becker](https://avatars.discourse-cdn.com/v4/letter/b/c77e96/32.png) [@Becker](https://discourse.nodered.org/u/Becker)\
**Post date:** [1 May 2022 14:45 UTC](https://discourse.nodered.org/t/writing-a-32bit-float-le-modbus/62026/3 "2022-05-01T14:45:40Z")

</div>

ok, is there any possibility to recreate 2x 16bit to write registers ?

example from input:  
 ![grafik](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/8/8/885212befa875a25365da3285ac5c68f0f84d6fe.png)

```auto
[
    {
        "id": "9be00b9bab774a27",
        "type": "inject",
        "z": "9fc0f809.f00518",
        "name": "",
        "props": [
            {
                "p": "payload"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "4893.3720703125",
        "payloadType": "num",
        "x": 1010,
        "y": 1060,
        "wires": [
            [
                "2944dd90b4f49503"
            ]
        ]
    },
    {
        "id": "2944dd90b4f49503",
        "type": "buffer-maker",
        "z": "9fc0f809.f00518",
        "name": "",
        "specification": "spec",
        "specificationType": "ui",
        "items": [
            {
                "name": "item1",
                "type": "floatle",
                "length": 1,
                "dataType": "msg",
                "data": "payload"
            }
        ],
        "swap1": "swap16",
        "swap2": "",
        "swap3": "",
        "swap1Type": "swap",
        "swap2Type": "swap",
        "swap3Type": "swap",
        "msgProperty": "payload",
        "msgPropertyType": "str",
        "x": 1210,
        "y": 1060,
        "wires": [
            [
                "0a0122983e4af6fb",
                "f1351bc61addfa16"
            ]
        ]
    }
]

```

edit: i think I got it:

```auto
[
    {
        "id": "9be00b9bab774a27",
        "type": "inject",
        "z": "9fc0f809.f00518",
        "name": "",
        "props": [
            {
                "p": "payload"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "4893.3720703125",
        "payloadType": "num",
        "x": 1010,
        "y": 1060,
        "wires": [
            [
                "2944dd90b4f49503"
            ]
        ]
    },
    {
        "id": "2944dd90b4f49503",
        "type": "buffer-maker",
        "z": "9fc0f809.f00518",
        "name": "",
        "specification": "spec",
        "specificationType": "ui",
        "items": [
            {
                "name": "item1",
                "type": "floatle",
                "length": 1,
                "dataType": "msg",
                "data": "payload"
            }
        ],
        "swap1": "swap16",
        "swap2": "",
        "swap3": "",
        "swap1Type": "swap",
        "swap2Type": "swap",
        "swap3Type": "swap",
        "msgProperty": "payload",
        "msgPropertyType": "str",
        "x": 1190,
        "y": 1060,
        "wires": [
            [
                "0a0122983e4af6fb",
                "f1351bc61addfa16"
            ]
        ]
    },
    {
        "id": "0a0122983e4af6fb",
        "type": "buffer-parser",
        "z": "9fc0f809.f00518",
        "name": "",
        "data": "payload",
        "dataType": "msg",
        "specification": "spec",
        "specificationType": "ui",
        "items": [
            {
                "type": "uint16be",
                "name": "item1",
                "offset": 0,
                "length": 2,
                "offsetbit": 0,
                "scale": "1",
                "mask": ""
            }
        ],
        "swap1": "",
        "swap2": "",
        "swap3": "",
        "swap1Type": "swap",
        "swap2Type": "swap",
        "swap3Type": "swap",
        "msgProperty": "payload",
        "msgPropertyType": "str",
        "resultType": "value",
        "resultTypeType": "return",
        "multipleResult": true,
        "fanOutMultipleResult": false,
        "setTopic": true,
        "outputs": 1,
        "x": 1370,
        "y": 1060,
        "wires": [
            [
                "f1351bc61addfa16"
            ]
        ]
    }
]

```

---

<div class="post-metadata">

**Author:** ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)\
**Post date:** [1 May 2022 14:51 UTC](https://discourse.nodered.org/t/writing-a-32bit-float-le-modbus/62026/4 "2022-05-01T14:51:03Z")

</div>

> [@Becker](#):
>
> example from input:  
> ![grafik](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/8/8/885212befa875a25365da3285ac5c68f0f84d6fe.png)

> [@Becker](#):
>
> is there any possibility to recreate 2x 16bit to write registers

Sure...

![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/5/6/5640c72a9b45898331c5f8d533a359685033174f.png)

```auto
[{"id":"9be00b9bab774a27","type":"inject","z":"76a6f1dc1056998c","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"4893.3720703125","payloadType":"num","x":1990,"y":816,"wires":[["2944dd90b4f49503"]]},{"id":"2944dd90b4f49503","type":"buffer-maker","z":"76a6f1dc1056998c","name":"","specification":"spec","specificationType":"ui","items":[{"name":"item1","type":"floatle","length":1,"dataType":"msg","data":"payload"}],"swap1":"swap16","swap2":"","swap3":"","swap1Type":"swap","swap2Type":"swap","swap3Type":"swap","msgProperty":"payload","msgPropertyType":"str","x":2190,"y":816,"wires":[["4e3d8ece4e3594bf"]]},{"id":"ea646b374b59410b","type":"debug","z":"76a6f1dc1056998c","name":"","active":true,"tosidebar":true,"console":false,"tostatus":true,"complete":"payload","targetType":"msg","statusVal":"payload","statusType":"auto","x":2194,"y":880,"wires":[]},{"id":"4e3d8ece4e3594bf","type":"buffer-parser","z":"76a6f1dc1056998c","name":"","data":"payload","dataType":"msg","specification":"spec","specificationType":"ui","items":[{"type":"uint16be","name":"floatAsUINT16","offset":0,"length":2,"offsetbit":0,"scale":"1","mask":""}],"swap1":"","swap2":"","swap3":"","swap1Type":"swap","swap2Type":"swap","swap3Type":"swap","msgProperty":"payload","msgPropertyType":"str","resultType":"keyvalue","resultTypeType":"return","multipleResult":false,"fanOutMultipleResult":false,"setTopic":true,"outputs":1,"x":2006,"y":880,"wires":[["ea646b374b59410b"]]}]

```

---

<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:** [15 May 2022 14:51 UTC](https://discourse.nodered.org/t/writing-a-32bit-float-le-modbus/62026/5 "2022-05-15T14:51:24Z")

</div>

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