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lennycb avatar image
lennycb asked

Anbindung an RPI4 | USB <-> TTL und USB <-> RS485

Mal ein paar Fragen an die, die ihre Geräte per RS485 und VE.direct anbinden und die Adapter selbst konfektioniert haben.


Meine Anlage funktionierte lange problemlos.

bisheriges Setup:

1x MultiPlus USB<->MK3 (org. Victron)

1x MPPT 100/20 USB<->TTL auf CH340 Basis

1x Shunt 500A USB<->TTL auf CH340 Basis

1x ET112 USB<->RS485 auf FTDI Basis


Nach Neustarts wurden immer alle Geräte problemlos gefunden.

Nun wurde die Anlage auf LiFePo4 umgebaut und ein größerer MPPT verbaut


neues Setup:

1x MultiPlus USB<->MK3 (org. Victron)

1x MPPT 100/50 USB<->TTL auf CH340 Basis

1x Shunt 500A USB<->TTL auf CH340 Basis

1x ET112 USB<->RS485 auf FTDI Basis

1x JBD BMS (LiFePo4) USB<->RS485 auf FTDI Basis


Nach der Installation der Komponenten zeigte sich, dass ich mal VenusOS auf dem Pi4 neu auflege.

Alle Komponenten wurden gefunden und korrekt im VenusOS angezeigt.


Letzte Änderung die ich durchführte war, der Austausch der Kabel vom MPPT zur Sammelschiene (Anpassung Querschnitt zum neuen MPPT)

Hier hatte ich den VE.direct Stecker am MPPT abgezogen und danach fing der Salat an.


Seit dem findet VenusOS nur noch sporadisch die Komponenten im VE-Netz.


Was habe ich schon recherchiert:

- gibt wohl arge Probleme mit USB/TTL Wandlern mit den CH340 Chips.

(Wundert mich aber, dass es so lange ohne Probleme lief)

- Victron empfiehlt die originalen Adapter.

(diese laufen m.M. auch nur mit einen FTDI-Chip, daher wundert es mich, dass meine USB/RS485 Umsetzer nicht gleichzeitig gehen)


Wer hat ne Idee warum meine Anlage solch "komisches Verhalten" an den Tag legt?

Wie macht ihr das?

Welche Umsetzer nutzt ihr?

Wer nutzt USB/TTL mit CP2104 Chip und funktioniert es mit mehr als einem?


So, genug Fragen, erst mal schöne Ostern!

VE.Directrs485
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johnny-brusevold avatar image johnny-brusevold commented ·

@lenny.cb

I have had some of the same errors that you describe here. Did not put down as much work in figuring it out, but think the chips were damaged by ground fault, since I used not insulated.

Switched to this and it has worked fine since.

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lennycb avatar image lennycb johnny-brusevold commented ·

@Johnny Brusevold well, that doesn't look bad. Thanks for the information!

One more question about that:

I don't have to do anything else for VE.direct. How about RS485? Then an additional UART<->RS485 converter must be in between?!


Oh, I only found one shop that sells this module. And they no longer send to the EU.

#############

Na das sieht nicht schlecht aus. Danke für die Info!

Noch eine Frage dazu:

Für VE.direct muss ich nichts weiter tun. Wie wäre es mit RS485? Dann muss noch ein zusätzlicher UART<->RS485 Konverter dazwischen?!

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johnny-brusevold avatar image johnny-brusevold lennycb commented ·

@lenny.cb

Duppa is in Italy and you can shop directly on the page I linked to

For 485 I use RS485 too ethernet-modbus converter, but so far only for energy meters.

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olafd avatar image olafd johnny-brusevold commented ·

Hello @Johnny Brusevold , Hello @lenny.cb ,


in my opinion this has nothing to do the chipsets. As long as VenusOS supports the specific chipset.

(FTDIs with serial number are working OK)


--> VenusOS 2.73 is OK:

In VenusOS 2.73 more then two RS485-Adapters should work OK.


--> VenusOS 2.8.2-large only one RS485-Adapter is working OK:

In VenusOS 2.82-large the 2nd one gets somewhere in conflict with the 1st one, with the result that none of them are working.


But in VenusOS 2.82-large one can start the 2nd, 3rd and so on manuelly.


If you manage to let the WatchDog do this, It would be restarted if there is an error.


After a restart you have to start the additional RS485-Adapters again.


Hope that helps


P.S.

At my side, I need to manage at least 3x RS485 connections, but up to now, haven’t found a working automated solution for this.


1st - EM24

2nd - JBD-BMS

3rd - JBD-BMS

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lennycb avatar image lennycb olafd commented ·

Hello @OlafD, yes, I had also read about it that it no longer works well or not at all from a certain firmware.

I had just tried that with 2.73. Unfortunately didn't work either. Only the ET112 is visible. The JBD BMS remains gone.


..."After a restart you have to start the additional RS485-Adapters again."...

How do you mean? Do you have the console commands for this?


Thanks very much!

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lennycb answered ·

@OlafD @Johnny Brusevold

now you've lost me.

I tested with a USB/TTL (CP2104) --> device is not found.

I tested with a USB/TTL (FTDI) --> device is not found.

What worked right away was the org. Victron VE.direct cable.


So and now it's getting strange. I put my setup back the way it was before. 2x USB/TTL (CH340) + 2x USB/RS485 (FTDI) + 1x MK3.

After restarting, all devices were found except the JBD. Short USB off and on again, all devices there.


I don't trust myself to restart now, because I don't know what it will look like then.


One thing I noticed, the PI is quite sluggish in the remote console.

My test PI (same model, same software version) doesn't show such a delay between input and reaction.


Can this all be explained?

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lennycb avatar image
lennycb answered ·

Hello @Johnny Brusevold @OlafD

so i give up. The whole thing can no longer be explained in normal words. Sometimes it works, sometimes not. I still think the code is poorly executed here. Imagine if every manufacturer of a jukebox or whatever only works with their own USB adapter. Terrible.


I now buy (against my conviction) all original cables.


However, I still have 2 questions:


1. Is it maybe the PI4???

2. How many USB-RS485 would I need for an EM112 and a JBD BMS? RS485 is normally a BUS system. But I could imagine that the Venus OS does not process this and wants its own adapter for each device.


Thank you!

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