# TCP/IP HEX Negative with node-red-contrib-buffer-parser
**URL:** https://discourse.nodered.org/t/tcp-ip-hex-negative-with-node-red-contrib-buffer-parser/73768
**Category:** General
**Tags:** function-node
**Created:** [16 January 2023 17:06 UTC](https://discourse.nodered.org/t/tcp-ip-hex-negative-with-node-red-contrib-buffer-parser/73768 "2023-01-16T17:06:33Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Guudiin](https://discourse.nodered.org/u/Guudiin)
#### Post date: [16 January 2023 17:06 UTC](https://discourse.nodered.org/t/tcp-ip-hex-negative-with-node-red-contrib-buffer-parser/73768/1 "2023-01-16T17:06:33Z")
The image makes it easier to show my problem.
When motors reach negative values, I am not able to read correctly.
I need it to be shown with negative values, like this -10.2.
I'm using node-red-contrib-buffer-parser.
Is there any way to get these values in negative?
obs: Positive values are with correct readings.
```auto
[{"id":"98c4d4346cbba315","type":"tab","label":"Flow 2","disabled":false,"info":"","env":[]},{"id":"b924138725949b87","type":"tcp in","z":"98c4d4346cbba315","name":"Dados Recebidos pela SKC","server":"client","host":"192.168.108.42","port":"5300","datamode":"stream","datatype":"buffer","newline":"","topic":"Status","trim":false,"base64":false,"tls":"","x":240,"y":200,"wires":[["4e6932a9669ce7a5"]]},{"id":"a4ac8421b0565106","type":"ui_text","z":"98c4d4346cbba315","group":"f2eb440f9653bb8c","order":1,"width":0,"height":0,"name":"","label":"Atuador 1","format":"{{msg.n0}} º","layout":"row-spread","className":"","x":860,"y":140,"wires":[]},{"id":"4e6932a9669ce7a5","type":"buffer-parser","z":"98c4d4346cbba315","name":"Angulos","data":"payload","dataType":"msg","specification":"spec","specificationType":"ui","items":[{"type":"uint16be","name":"Atuador1","offset":4,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"uint16be","name":"Atuador2","offset":6,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"uint16be","name":"Atuador3","offset":8,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"uint16be","name":"Atuador4","offset":10,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"uint16be","name":"Atuador5","offset":12,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"uint16be","name":"Atuador6","offset":14,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"uint16be","name":"Atuador7","offset":16,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"uint16be","name":"Atuador8","offset":18,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"uint16be","name":"Atuador9","offset":20,"length":1,"offsetbit":0,"scale":"1","mask":""},{"type":"uint16be","name":"Atuador10","offset":22,"length":1,"offsetbit":0,"scale":"1","mask":""}],"swap1":"","swap2":"","swap3":"","swap1Type":"swap","swap2Type":"swap","swap3Type":"swap","msgProperty":"payload","msgPropertyType":"str","resultType":"value","resultTypeType":"return","multipleResult":false,"fanOutMultipleResult":true,"setTopic":true,"outputs":1,"x":480,"y":200,"wires":[["bf3e8044c3ed9270"]]},{"id":"bf3e8044c3ed9270","type":"function","z":"98c4d4346cbba315","name":"function 14","func":"let lista = [];\nlet resposta = [];\n\nfor (var i = 0; i < 11; i++) {\n lista[i] = msg.payload[i];\n resposta[i] = lista[i] / 100;\n}\n\nmsg.n0 = resposta[0];\nmsg.n1 = resposta[1];\nmsg.n2 = resposta[2];\nmsg.n3 = resposta[3];\nmsg.n4 = resposta[4];\nmsg.n5 = resposta[5];\nmsg.n6 = resposta[6];\nmsg.n7 = resposta[7];\nmsg.n8 = resposta[8];\nmsg.n9 = resposta[9];\nreturn [msg, msg, msg, msg, msg, msg, msg, msg, msg, msg]\n","outputs":10,"noerr":0,"initialize":"","finalize":"","libs":[],"x":650,"y":200,"wires":[["a4ac8421b0565106"],["d551d6e2e74f0c50"],[],[],[],[],[],[],[],[]]},{"id":"d551d6e2e74f0c50","type":"ui_text","z":"98c4d4346cbba315","group":"f2eb440f9653bb8c","order":2,"width":0,"height":0,"name":"","label":"Atuador 2","format":"{{msg.n1}} º","layout":"row-spread","className":"","x":860,"y":180,"wires":[]},{"id":"f2eb440f9653bb8c","type":"ui_group","name":"Atuadores","tab":"ceba900fb09301d5","order":1,"disp":true,"width":"6","collapse":false,"className":""},{"id":"ceba900fb09301d5","type":"ui_tab","name":"Atuadores","icon":"dashboard","disabled":false,"hidden":false}]
```
---
### Author:  [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [16 January 2023 18:51 UTC](https://discourse.nodered.org/t/tcp-ip-hex-negative-with-node-red-contrib-buffer-parser/73768/2 "2023-01-16T18:51:46Z")
> [@Guudiin](#):
>
> Is there any way to get these values in negative?
Yes, use `int16` instead of `uint16`.
INT16 is "16 bit Integer" (e.g. -32768 ~ 32767)
UINT16 is "Unsigned 16 bit Integer" (e.g. 0 ~ 65535)
Buffer Parser Setup...
Other stuff:
New flow:
Result:
Demo Flow...
```auto
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```
---
### Author:  [@Guudiin](https://discourse.nodered.org/u/Guudiin)
#### Post date: [17 January 2023 11:19 UTC](https://discourse.nodered.org/t/tcp-ip-hex-negative-with-node-red-contrib-buffer-parser/73768/3 "2023-01-17T11:19:33Z")
Thank you very much !!
I followed your tip and it started to work correctly. Again thank you very much !!!
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [31 January 2023 11:19 UTC](https://discourse.nodered.org/t/tcp-ip-hex-negative-with-node-red-contrib-buffer-parser/73768/4 "2023-01-31T11:19:59Z")
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