# Reposting old Question and Documentation Request

**URL:** <https://discourse.nodered.org/t/reposting-old-question-and-documentation-request/56908>\
**Category:** General\
**Created:** [19 January 2022 08:02 UTC](https://discourse.nodered.org/t/reposting-old-question-and-documentation-request/56908 "2022-01-19T08:02:48Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Tinku](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@Tinku](https://discourse.nodered.org/u/Tinku)\
**Post date:** [19 January 2022 08:02 UTC](https://discourse.nodered.org/t/reposting-old-question-and-documentation-request/56908/1 "2022-01-19T08:02:49Z")

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Im Repostiong the question: [RFID with Balluff](https://discourse.nodered.org/t/rfid-with-balluff/47190) from @AaronV

where do I get documentation that how the TCP nodes work?

Many thanks in advance 🙂

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**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:** [19 January 2022 09:47 UTC](https://discourse.nodered.org/t/reposting-old-question-and-documentation-request/56908/2 "2022-01-19T09:47:38Z")

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The TCP nodes (like most nodes) have built in documentation (side bar, help)

The balluff protocol is a simple ASCII protocol and is well documented in the manual.

Give it a go & if you get stuck, head back to the forum with a specific question.

If you are new to node-red, I would recommend watching this playlist: [Node-RED Essentials](https://www.youtube.com/playlist?list=PLyNBB9VCLmo1hyO-4fIZ08gqFcXBkHy-6). The videos are done by the developers of node-red. They're nice & short and to the point. You will understand a whole lot more in about 1 hour. A small investment for a lot of gain.

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**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:** [24 February 2022 14:43 UTC](https://discourse.nodered.org/t/reposting-old-question-and-documentation-request/56908/4 "2022-02-24T14:43:53Z")

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> [@Tinku](#):
>
> Is this right way?

No, this will not create a buffer, it will create an array.  
And even if it was a buffer or array of byte values, you cannot fit 512 into a byte (0x0 ~ 0xFF / 0 ~ 255 / 1 byte / 8 bits)  
Lastly, you cannot just leave gaps in the byte array unless you later fill them with zero (before transmission)

In an effort to get you moving, can you point to (or screenshot) an actual TCP communication example  
(including what to send and the format of the response) from the Balluff manual & i will show you how to construct the necessary packet.

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**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:** [24 February 2022 15:15 UTC](https://discourse.nodered.org/t/reposting-old-question-and-documentation-request/56908/6 "2022-02-24T15:15:25Z")

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It seems you have started a new thread around the same subject.

Please continue on 1 thread only - as this just causes confusion.

Continued here: [Sample buffer Data for testing](https://discourse.nodered.org/t/sample-buffer-data-for-testing/58921)

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**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:** [24 February 2022 15:15 UTC](https://discourse.nodered.org/t/reposting-old-question-and-documentation-request/56908/7 "2022-02-24T15:15:55Z")

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