# Siemens ISO Transport Protocol

**URL:** <https://discourse.nodered.org/t/siemens-iso-transport-protocol/37480>\
**Category:** General\
**Created:** [14 December 2020 12:16 UTC](https://discourse.nodered.org/t/siemens-iso-transport-protocol/37480 "2020-12-14T12:16:54Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ward](https://avatars.discourse-cdn.com/v4/letter/w/439d5e/32.png) [@Ward](https://discourse.nodered.org/u/Ward)\
**Post date:** [14 December 2020 12:16 UTC](https://discourse.nodered.org/t/siemens-iso-transport-protocol/37480/1 "2020-12-14T12:16:54Z")

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Hi,

I've been looking a while for a solution. But so far no succes.

We have a siemens PLC with a connection throught the ISO Transport Protocol:

```auto
ISO transport connections are used for data exchange between S7 stations and for communication with PC stations, S5 stations and third-party systems.

Properties of the ISO transport connection:

* Communication between stations is based on MAC addresses.
* Data transmission with data blocks is suitable for data volumes of up to 8 Kbytes.
* Data transmission can take place with the "SEND/RECEIVE" and "FETCH/WRITE" services.
* Data reception is confirmed by the partner by means of an acknowledgment on layer 4 of the ISO reference model.
* Data can **not** be conducted over a router ( **no** protocol with routing capability, because communication is based on MAC addresses and not IP addresses).

```

But the S7-node only accept ISO-on-TCP and MPI/DP/MPI. And i don't find another node. Also trying to search for a node wich make a connection through a MAC adress not related to siemens but don't find anything usable.

Does anyone know if there exist such a node? Or how i can make a connection through another way?

Thanks at advance.  
Kind regards,  
Ward

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [12 February 2021 12:16 UTC](https://discourse.nodered.org/t/siemens-iso-transport-protocol/37480/2 "2021-02-12T12:16:57Z")

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Closed on 12 February 2021 12:16 UTC

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