# Mdbus tcp\\rtu gateway
**URL:** https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003
**Category:** General
**Created:** [3 November 2022 08:53 UTC](https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003 "2022-11-03T08:53:08Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@BLND](https://discourse.nodered.org/u/BLND)
#### Post date: [3 November 2022 08:53 UTC](https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003/1 "2022-11-03T08:53:08Z")
I have 2 modbus rtu devices connecting to node red through one modbus tcp\rtu gateway, i try to control both of them at the same time but i can not. can someone help me
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [3 November 2022 10:28 UTC](https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003/2 "2022-11-03T10:28:09Z")
> [@BLND](#):
>
> can someone help me
Probably, but only if you give us a lot more information. Show us how you are trying to do it.
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### Author:  [@BLND](https://discourse.nodered.org/u/BLND)
#### Post date: [5 November 2022 09:46 UTC](https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003/3 "2022-11-05T09:46:23Z")
I used modbus read node and write node for both of them.
But I may have to use flex getter nodes.
And about the server, which one must be the server the gateway or the modbus devices themselves?
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### Author:  [@BLND](https://discourse.nodered.org/u/BLND)
#### Post date: [5 November 2022 09:47 UTC](https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003/4 "2022-11-05T09:47:02Z")
Thanks alot
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [5 November 2022 10:07 UTC](https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003/5 "2022-11-05T10:07:21Z")
> [@BLND](#):
>
> bout the server, which one must be the server the gateway or the modbus devices themselves
You said you had it working, so you must be doing it right already.
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### Author:  [@BLND](https://discourse.nodered.org/u/BLND)
#### Post date: [5 November 2022 10:17 UTC](https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003/6 "2022-11-05T10:17:30Z")
If I connect only one plc to node red, I can connect, read and write
But more than one device I can not
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### Author:  [@BLND](https://discourse.nodered.org/u/BLND)
#### Post date: [5 November 2022 10:19 UTC](https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003/7 "2022-11-05T10:19:33Z")
I mean if I connect 2 or more rtu modbus devices to node red through the modbus tcp/rtu gateway I can not control all of them at the same time
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### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [5 November 2022 10:22 UTC](https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003/8 "2022-11-05T10:22:35Z")
You have not told us how you are trying to do it, in detail so that we can work out what the problem may be.
Edit: Corrected sentence above
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [4 January 2023 10:23 UTC](https://discourse.nodered.org/t/mdbus-tcp-rtu-gateway/70003/9 "2023-01-04T10:23:00Z")
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