# Open Port RS485
**URL:** https://discourse.nodered.org/t/open-port-rs485/63429
**Category:** General
**Created:** [3 June 2022 16:26 UTC](https://discourse.nodered.org/t/open-port-rs485/63429 "2022-06-03T16:26:52Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Michell\_Iron\_Man](https://discourse.nodered.org/u/Michell_Iron_Man)
#### Post date: [3 June 2022 16:26 UTC](https://discourse.nodered.org/t/open-port-rs485/63429/1 "2022-06-03T16:26:52Z")
I have a CM4-IO-POE-4G-box gateway based on raspberry, I want to know how to activate the RS485 port to be able to carry out serial communication in Node-RED
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### Author:  [@SP-Mushrooms](https://discourse.nodered.org/u/SP-Mushrooms)
#### Post date: [7 June 2022 01:53 UTC](https://discourse.nodered.org/t/open-port-rs485/63429/3 "2022-06-07T01:53:14Z")
> [@How do I use serialport node to write to a RS485](https://discourse.nodered.org/t/how-do-i-use-serialport-node-to-write-to-a-rs485/63484/4):
>
> If you want to send 68 03 01 00 22 aa 04 9e to the serial port then use either a SERIAL Request or SERIAL Out node. Use an INJECT to send a buffer with 68 03 01 00 22 aa 04 9e As i said before... inject (set some data in the payload) point_right serial request (setup the correct com settings) point_right debug node (see if you get a reply) They have buffers (which are byte arays) There is no JavaScript required for this - it is a "no code" example... [image] ↑ Not a bit of JavaScri…
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [6 August 2022 01:53 UTC](https://discourse.nodered.org/t/open-port-rs485/63429/4 "2022-08-06T01:53:36Z")
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