# Modbus data swap
**URL:** https://discourse.nodered.org/t/modbus-data-swap/84136
**Category:** General
**Created:** [30 December 2023 16:09 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136 "2023-12-30T16:09:48Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@PRABHAKAR82](https://discourse.nodered.org/u/PRABHAKAR82)
#### Post date: [30 December 2023 16:09 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136/1 "2023-12-30T16:09:48Z")
I have these data and i want to convert it on real value.
[16384,17372,55706,17374,49152,17359,0,16680,0,16696,39322,16729,45875,17224,29491,17352,49152,17363,32768,17237,45875,17236,26214,17255,52429,16966,52429,16204,19661,17302]
Total float tag on a plc side is 15 but on a node-red side I get output of 30 int value.
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### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [30 December 2023 16:12 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136/2 "2023-12-30T16:12:50Z")
Install node-red-contrib-buffer-parser, feed the data into a parser node, then you can do whatever you need to the data (convert to string/float/int32/bit array/whatever) big/little endian swap 16/32 etc
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### Author:  [@PRABHAKAR82](https://discourse.nodered.org/u/PRABHAKAR82)
#### Post date: [30 December 2023 16:36 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136/3 "2023-12-30T16:36:47Z")
I installed it but i have some doubt What's the ofset value i have to take to convert it again in float.
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### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [30 December 2023 16:54 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136/4 "2023-12-30T16:54:35Z")
Read the built in help. Offset is the byte position to take from the buffer. It explains it better there.
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### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [30 December 2023 16:55 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136/5 "2023-12-30T16:55:40Z")
If you get stuck, tell us where in the data you expect the float values to be and what you expect them to be.
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### Author:  [@PRABHAKAR82](https://discourse.nodered.org/u/PRABHAKAR82)
#### Post date: [30 December 2023 16:57 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136/6 "2023-12-30T16:57:47Z")
I did this configuration but data is not properly converted into float.
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### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [30 December 2023 17:08 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136/7 "2023-12-30T17:08:32Z")
> [@PRABHAKAR82](#):
>
> but data is not properly converted into float
As I said before...
> [@Steve-Mcl](#):
>
> what you expect them to be
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### Author:  [@PRABHAKAR82](https://discourse.nodered.org/u/PRABHAKAR82)
#### Post date: [30 December 2023 17:25 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136/8 "2023-12-30T17:25:24Z")
original data is look like this on plc side
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### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [30 December 2023 17:34 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136/9 "2023-12-30T17:34:06Z")
Swap16, FloatLE
```auto
[{"id":"ae45490c5740f4bb","type":"buffer-parser","z":"eaa6d97a6ede80ab","name":"","data":"payload","dataType":"msg","specification":"spec","specificationType":"ui","items":[{"type":"floatle","name":"Meter_1_V_RY","offset":0,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"floatle","name":"Meter_1_V_RB","offset":4,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"floatle","name":"Meter_1_V_YB","offset":8,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"floatle","name":"Meter_1_C_R","offset":12,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"floatle","name":"Meter_1_C_Y","offset":16,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"floatle","name":"Meter_1_C_B","offset":20,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"floatle","name":"Meter_1_P_R","offset":24,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"floatle","name":"Meter_1_P_Y","offset":28,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"floatle","name":"Meter_1_P_B","offset":32,"length":1,"offsetbit":0,"scale":"1","mask":""}],"swap1":"swap16","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":1120,"y":560,"wires":[["62cc010bae21e18e"]]},{"id":"847a9249773972a5","type":"inject","z":"eaa6d97a6ede80ab","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"[16384,17372,55706,17374,49152,17359,0,16680,0,16696,39322,16729,45875,17224,29491,17352,49152,17363,32768,17237,45875,17236,26214,17255,52429,16966,52429,16204,19661,17302]","payloadType":"json","x":1090,"y":500,"wires":[["ae45490c5740f4bb"]]},{"id":"62cc010bae21e18e","type":"debug","z":"eaa6d97a6ede80ab","name":"debug 113","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":1310,"y":560,"wires":[]}]
```
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [28 February 2024 17:34 UTC](https://discourse.nodered.org/t/modbus-data-swap/84136/10 "2024-02-28T17:34:35Z")
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