Greetings, I now have my Monarco hat and everything up and running.

RS485 for Modbus RTU about monarco-hat-library-for-codesys-v3 HOT 8 CLOSED

aliazzzz commented on June 23, 2024

RS485 for Modbus RTU

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Comments (8)

Aliazzzz commented on June 23, 2024

Dear Hubieg,

Sorry for the late anwser.

For RS485 You cannot go without external libraries! The only direct interaction with the HAT is needed to set some RS485 settings, like baudrate, bits per byte, parity and stopbits, also to check some faulkt counters. The rest is done via the external library.
Fortunatly, you can pick your own flavour of library, which in my opinion is a big plus. So, I deliberatly chose a CAA type library ( Uniformity (standard behaviour model, more platform independendant)

Also, My advice would be to carefully read the Monarco documentation on the RS485 interface, found here: https://github.com/monarco/monarco-hat-documentation.

A personal note:
I included RS485 for completeness, but I personally do not have any use for it. Maybe you can hook up a Heater via the thermostat wiring, as this an RS485 connection (Opentherm talks via 2 wire RS485) so that can be a nice home automation project. Personally, I'd choose a CAN interface on that place, but that's life.

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Hubieg commented on June 23, 2024

Thanks for the reply!! I have read the documentation and it seems to indicate RS485 is brought directly in (and out) via UART0. This means (to me anyway) that Codesys should be able to directly control the serial port via its native interface. It also seems to me that the library is called from the CAA library in the Codesys config file in /etc/Codesys.... I did read elsewhere that another Pi native application may be "walking over" the UART for use with Bluetooth on the V3 Pi. I will follow this up with Monarco and report it back here. Modbus RTU is something that hopefully I can then add to the project. If the hardware is there and capable, it would be a very handy addition to the project. Cheers, Todd

…

On Mon, Nov 27, 2017 at 6:55 AM, Aliazzzz ***@***.***> wrote: Dear Hubieg, Sorry for the late anwser. For RS485 You cannot go without external libraries! The only direct interaction with the HAT is needed to set some RS485 settings, like baudrate, bits per byte, parity and stopbits, also to check some faulkt counters. The rest is done via the external library. Fortunatly, you can pick your own flavour of library, which in my opinion is a big plus. So, I deliberatly chose a CAA type library ( Uniformity (standard behaviour model, more platform independendant) Also, My advice would be to carefully read the Monarco documentation on the RS485 interface, found here: https://github.com/monarco/ monarco-hat-documentation. A personal note: I included RS485 for completeness, but I personally do not have any use for it. Maybe you can hook up a Heater via the thermostat wiring, as this an RS485 connection (Opentherm talks via 2 wire RS485) so that can be a nice home automation project. Personally, I'd choose a CAN interface on that place, but that's life. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#5 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AgDU9mAkIZwBZWt1AJafvZkLMdy4CfsGks5s6qMWgaJpZM4QqdRI> .

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Aliazzzz commented on June 23, 2024

Dear Hubieg,

I would like to let you know that I am planning to release a new version within a month from now (I hope).

This version will not be entirely backward compatible with v0.9.0.3 but it will bring you more comfort with using the HAT's IO. So, using RS485, 1w, and RTC should not be affected by this update, but all other IO will.

So, stay tuned for it.

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Hubieg commented on June 23, 2024

Ill look foreward to it. In the mean time i am persuing the issue of RS485 from within Codesys and Modbus RTU. Hopefully i can contribute. Cheers, Todd

…

On Nov 27, 2017 10:24 AM, "Aliazzzz" ***@***.***> wrote: Dear Hubieg, I would like to let you know that I am planning to release a new version within a month from now (I hope). This version will not be entirely backward compatible with v0.9.0.3 but it will bring you more comfort with using the HAT's IO. So, using RS485, 1w, and RTC should not be affected by this update, but all other IO will. So, stay tuned for it. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#5 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AgDU9r5oBIdEin13nobDTQ3aLBQWuQjmks5s6tRHgaJpZM4QqdRI> .

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Aliazzzz commented on June 23, 2024

PS let me know how you test RS485!

I am curious on how you are testing this, because I suspect the problem is Linux/ hardwaredriver related.

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Hubieg commented on June 23, 2024

I just woke to an email from Monarco. Seems the main problem is tha bluetooth does indeed need to be disabled and is trying to uses ttyAMA0. As soon as i can edit the email i will forward the "high points" of it.

…

On Nov 28, 2017 3:09 AM, "Aliazzzz" ***@***.***> wrote: *PS let me know how you test RS485!** I am curious on how you are testing this, because I suspect the problem is Linux/ hardwaredriver related. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#5 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AgDU9lJ3aTyQr-LM2o2DxTEmL_66F-MZks5s67-ngaJpZM4QqdRI> .

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Hubieg commented on June 23, 2024

This from Monarco. I remember what i think was the line about "sed". Not sure tbough if that needs to run in the rc scripts everytime. I cant do much tezting at the moment as im back at my "day job" the next few weeks. As for testing, i was using an rs485 adaptor on my pc. I tried both terminal to terminal, and Modbus to a modbus slave program on my computer. You are right about the Bluetooth. It is fixed by the overlay in steps 3-5 of the installation instructions, so you should be good (if you followed them): https://github.com/Aliazzzz/Monarco-HAT-library-for-CODESYS-V3#hardware- installation You also have to disable Linux console (step 2 of the instructions) otherwise it will appear on the RS485 bus. And last but not least you have to setup Codesys as per steps 9-11. Further information about RS485 on the Monarco HAT can be found here: https://github.com/monarco/monarco-hat-documentation/ blob/master/Monarco_HAT_Integration_Raspberry-Pi_Linux.md#uart--rs-485- communication

…

On Nov 28, 2017 7:25 AM, "Todd Simpson" ***@***.***> wrote: I just woke to an email from Monarco. Seems the main problem is tha bluetooth does indeed need to be disabled and is trying to uses ttyAMA0. As soon as i can edit the email i will forward the "high points" of it. On Nov 28, 2017 3:09 AM, "Aliazzzz" ***@***.***> wrote: > *PS let me know how you test RS485!** > > I am curious on how you are testing this, because I suspect the problem > is Linux/ hardwaredriver related. > > — > You are receiving this because you authored the thread. > Reply to this email directly, view it on GitHub > <#5 (comment)>, > or mute the thread > <https://github.com/notifications/unsubscribe-auth/AgDU9lJ3aTyQr-LM2o2DxTEmL_66F-MZks5s67-ngaJpZM4QqdRI> > . >

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Aliazzzz commented on June 23, 2024

As I too have a dayjob, I will wait until you have tested this point on your own system.
Until then I will concentrate on implementation of v0.9.1.1

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RS485 for Modbus RTU about monarco-hat-library-for-codesys-v3 HOT 8 CLOSED

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