# Node-red-contrib-mcprotocol quality "bad" on some write requests

**URL:** <https://discourse.nodered.org/t/node-red-contrib-mcprotocol-quality-bad-on-some-write-requests/73446>\
**Category:** General\
**Created:** [10 January 2023 08:13 UTC](https://discourse.nodered.org/t/node-red-contrib-mcprotocol-quality-bad-on-some-write-requests/73446 "2023-01-10T08:13:01Z")\
**Posts on this page:** 1\
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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:** [10 January 2023 10:25 UTC](https://discourse.nodered.org/t/node-red-contrib-mcprotocol-quality-bad-on-some-write-requests/73446/8 "2023-01-10T10:25:55Z")

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Yes, I think 5000 & 5001 are built-in ports for TCP and UDP. I forget because they changed over the years and A, QnA, Q, series.

Try ports \>= 3000 - they worked for me.

See this detail heavy reply...

> [@Mitsubishi Q Series Node Red Help](https://discourse.nodered.org/t/mitsubishi-q-series-node-red-help/33337/5):
>
> Here is a working example... Note the UDP MC Protocol + Port Number... NOTE: As with many things mitsubishi, you might need to power off/on the PLC for the settings change to take effect. Lastly, regarding reading data from mc protocol... We tend to arrange ladder to put all items of interest in one contiguous data block (e.g. D1000~D1199) then read all 200 WORDS in one go Then I use another node called [buffer-parser](https://flows.nodered.org/node/node-red-contrib-buffer-parser) to convert all the WORD values into nice data…

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