Serial UART not working

[ouranos6]

Hi,

Hardware:
Rpi 3
USB to m-bus
TTL to m-bus
TSS721 Module M-BUS To TTL with RX TX Indicator STM32 Development Board Free Shipping
https://a.aliexpress.com/_A7ii0r

I have two setups, the first one with an USB m-bus who is working very well.

The second one is an ttl m-bus and I have an issue when I set ‘/dev/ttyAMA0’, the server loose connection

If I use the serial IN I have no problem to connect.

What I’am doing wrong?

[ouranos6]

Ok now I have someting else, after disabling the console to serial and enabling the serial port I have another strange behaviour.

each 10 sec. it try to reconnect and say "one device loaded from file" I guess it's before I've tried with the USB to m-bus

Any clue?

[robertsLando]

Try to delete the file

[ouranos6]

ok but where is the file?
return RED.settings.userDir + '/' + DEVICES_FILE + (node.name ? '_' + node.name : '') + '.json';
but in .node-red/ I can't see anyting with devices... .json

[robertsLando]

You should check what's your settings userDir. You find it in settings.json. By default it should be: ~/.node-red

[ouranos6]

ok found it and remove it, reboot the RPI and now it says error: no device to update

[ouranos6]

after a new reboot and a new scan I have scan complete 0 devices found but it's wired on the same way that I was using the USB

[robertsLando]

I cannot see anything wrong here, unfortunally sometimes the problems could be caused by wrong connections or usb adapters that are not working properly

[ouranos6]

ok, I will try again tonight, and let you know if it's working right

[tsr8]

Similar issue. scan complete 0 devices found. I have M-BUS to RS485 converter, if I connect it to PC and using MBus scan software (M-Bus sheet) then all connected heat meters founded (11) but in node-red it is zero. Can't get device data from getDevice: Error while reading device 67102948 : Error: Failed to send/receive M-Bus request frame[67102948], where 67102948 is the secondary address.
What could be wrong?
Is libmbus necessary to node-red-contrib-m-bus work?

[tsr8]

I have solved my issue. It was caused by too small timeouts in libmbus library. Created an libmbus issue: rscada/libmbus#186
And node-mbus issue: Apollon77/node-mbus#70