# Sending Hexadecimal commands to a DX 200 controller via TCP
**URL:** https://discourse.nodered.org/t/sending-hexadecimal-commands-to-a-dx-200-controller-via-tcp/61224
**Category:** General
**Created:** [13 April 2022 07:56 UTC](https://discourse.nodered.org/t/sending-hexadecimal-commands-to-a-dx-200-controller-via-tcp/61224 "2022-04-13T07:56:45Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@Vedant](https://discourse.nodered.org/u/Vedant)
#### Post date: [13 April 2022 07:56 UTC](https://discourse.nodered.org/t/sending-hexadecimal-commands-to-a-dx-200-controller-via-tcp/61224/1 "2022-04-13T07:56:45Z")
Hello Everyone! I am trying to send some hexa decimal commands to a DX200 controller via tcp request node and ideally it should respond with some data. Right now it is not sending anything. I have defined the ip address and port in the tcp request node. I am new to node red, please help me with your kind suggestions.
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### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [13 April 2022 11:46 UTC](https://discourse.nodered.org/t/sending-hexadecimal-commands-to-a-dx-200-controller-via-tcp/61224/2 "2022-04-13T11:46:45Z")
Well from the little we can see it would seem to be sort of right... but
a) do you really mean port 80 ? That is usually for web / http so why not use an http request node ?
b) have you added a debug node before the tcp node to inspect exactly what you are sending and if it is correct.
c) how have you configured the tcp node to respond ? after a timeout ? after a specific character ?
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### Author:  [@Vedant](https://discourse.nodered.org/u/Vedant)
#### Post date: [13 April 2022 12:35 UTC](https://discourse.nodered.org/t/sending-hexadecimal-commands-to-a-dx-200-controller-via-tcp/61224/3 "2022-04-13T12:35:54Z")
Thank you for your quick response! I have added a debug node before the tcp node and it prints buffer of 32 bytes as I defined in the function node. I have configured the tcp node after a fixed timer of 100 ms.
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### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [13 April 2022 12:40 UTC](https://discourse.nodered.org/t/sending-hexadecimal-commands-to-a-dx-200-controller-via-tcp/61224/4 "2022-04-13T12:40:02Z")
great - so as long as those bytes are correct and the device ip address **and PORT** are correct then it should work... but I still think port 80 is meant to be http...
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### Author:  [@Vedant](https://discourse.nodered.org/u/Vedant)
#### Post date: [13 April 2022 12:43 UTC](https://discourse.nodered.org/t/sending-hexadecimal-commands-to-a-dx-200-controller-via-tcp/61224/5 "2022-04-13T12:43:36Z")
Oh, I will check again the port but do I need to define another function or something in order to get the data from the controller or it would display in the debug window?
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### Author:  [@dceejay](https://discourse.nodered.org/u/dceejay)
#### Post date: [13 April 2022 12:44 UTC](https://discourse.nodered.org/t/sending-hexadecimal-commands-to-a-dx-200-controller-via-tcp/61224/6 "2022-04-13T12:44:25Z")
It should just display something (you have set it to be a buffer) so yes a buffer.
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### Author:  [@Vedant](https://discourse.nodered.org/u/Vedant)
#### Post date: [13 April 2022 12:47 UTC](https://discourse.nodered.org/t/sending-hexadecimal-commands-to-a-dx-200-controller-via-tcp/61224/7 "2022-04-13T12:47:52Z")
Thank you so much Sir for your help and quick responses! I will update you with the resullts.