Using RS485 port on CC100 with NodeRED

Node-RED
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21

Please check the FW for both CC100’s. In the short term, it may be necessary to install older FW.

23

@WagoKurt Thanks for you reply. Both my CC100 have 03.09.07(21) firmware. So that is not the issue it seems.

24

Interesting. Can you please check the versions of the node-red-contrib-modbus and Node-RED?

25

11 Aug 18:00:19 - [info] Node-RED version: v3.0.2
11 Aug 18:00:19 - [info] Node.js version: v16.20.1
11 Aug 18:00:19 - [info] Linux 5.10.21-rt34w03.01.06 arm LE

node-red-contrib-modbus 5.26.0

26

I suspect this might actually caused by incorret permission for node red to use the serial port.

(Dont mind the date, but I get the same return)

docker exec -it wago-node-red /bin/bash
ls -l /dev/ttySTM1
crw-rw---- 1 root 106 247, 1 Jun 15 10:04 /dev/ttySTM1

Should it not be lrwxrwxrwx?

I also have to make the permissions persisten somehow. Will test this ASAP.

Docker is installed by uploading the docker ipk in the wbm. node red run command:
docker run -d --restart unless-stopped --name wago-node-red -d --privileged=true --user=root -p
1880:1880 --device=/dev/ttySTM1:/dev/serial:rw --security-opt=seccomp=unconfined -v
node_red_user_data:/data nodered/node-red

I dont think this procedure automatically grants all the neccessary permissions for node red to access the serial port and then throws node red into infinate reboot loop when using a modbus node.

I think I’ve might been a bit confused by the initial post in this thread, where it says that node red should have the correct permissions by default.

27

hi, do we have a solution to the problem of the serial port not working properly?

28

Hello WAGO community,

Did anyone solve this issue with serial port and Node Red on Wago CC-100 ?
I had exactly the same issue with Node-RED stuck in infinite crash loop after trying to set up modbus connection through serial port.
The only solution that works for me is using older Node-Red version (v 3.0.2) installed with container from the image:
docker run -d
–name node-red
–restart always
–privileged=true
–user=root
-p 1880:1880
-p 505:505
-v node_red_user_data:/data
-v /dev/ttySTM1:/dev/serial
wagoautomation/node-red-cc100:1.0.0

rather than from image:
docker run -d --name node-red --restart=always
-d --privileged=true --user=root
-p 1880:1880
-p 505:505
-v node_red_user_data:/data
-v /dev/ttySTM1:/dev/serial
nodered/node-red
where with version 3.1 serial port will not work with modbus nodes in NodeRed :confused:

29

You might want to try using modbus@5.25.0 along with dependencies serialport@10.5.0 and modbus-serial@8.0.8.

I’m hoping WAGO releases a new cc100 image that supports Node.js > 18 and Node-RED 4, along with a fully functional CC100 serial port. Dashboard 1 is depreceated and dashboard 2 can’t be used with current wago CC100 image

30

Hello,
In the vanilla node-red installation, does the problem came from the serial node ?
Last time I was able to make it work by using this work around:

  • I you don’t have Portainer:
    Login in the PFC100/PFC200/CC100 with SSH then go to elevated user by using the command su -
    Then use the command docker exec -ti --user root <containername> /bin/bash to open the container console as root.
  • If you have Portainer, use it to log in the container console in root.
  • In the container console, go to the node-red data folder cd /data/
  • Execute the command npm rebuild --build-from-source

This will rebuild the serial node from source to the specific of the system.

31

NodeRed CC100 Modbus RTU:

please do the following steps:

  1. stop the container
  2. delete the container and volume
  3. start the container new
  4. enter the container and build node-red-contrib-modbus new

docker stop node-red
docker rm
docker volume rm node_red_user_data
docker run --name wago-node-red --privileged=true --user=root --network=host --device=/dev/ttySTM1:/dev/ttySTM1:rw -v node_red_user_data:/data nodered/node-red
docker exec -it wago-node-red /bin/bash

npm install node-red-contrib-modbus
npm rebuild --build-from-source

32

Works Perfect! :slight_smile: THX

33

Hey, I pushed to my repository working image ( damrudwago/node-red-cc100 - Docker Image | Docker Hub)

You can run it with command:
docker run -d --restart always --name wago-node-red --privileged=true --security-opt seccomp:unconfined --user=root --network=host -p 1880:1880 -v node_red_user_data:/data -v /dev/ttySTM1:/dev/serial damrudwago/node-red-cc100:1.0.0

34

Thanks, Damian. I just tried this on a 751-9301 (FW28) with your image and it worked!

35

Hi, does it allow my application to share the same Modbus RTU ports?
My problem is that the runtime seems not to allow sharing resources.