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GyroGearl00se / ESPHome-Froeling-Lambdatronic_3200

ESHome RS232 to TTL - ESP32 - Read data from Froeling / Lambdatronic 3200
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Caution: Fake MAX3232 DB9 RS232 TTL converter #2

Closed wavoigt closed 6 months ago

wavoigt commented 7 months ago

This Converters may have Chinese Fake MAX3232 Chips, with following consequences: Internal crosstalk on the chip leads to a distorted "echo" on the tx line which may disturb the communication with Froeling 3200!!! see also: https://blog.bogpeople.com/2015/01/fake-max3232-rs232-line-drivers.html

I changed the MAX3232 by the original Maxim part and all worked fine.

GyroGearl00se commented 7 months ago

Do you know any board with the genuine part where you can provide a link ?

Or do you suggest desoldering the IC from the current board and replacing it with the genuine ?

So far it seems like I haven't had any issues with my current module.

wavoigt commented 7 months ago

Sorry, all the interface boards i found might have the fake chip. If you have problems with the communication with any device I suggest replacing the chip. https://www.reichelt.de/rs232-2-treiber-2-empfaenger-so-16-max-3232-cse-p57869.html?&trstct=pos_0&nbc=1

GyroGearl00se commented 7 months ago

Sorry, all the interface boards i found might have the fake chip. If you have problems with the communication with any device I suggest replacing the chip. https://www.reichelt.de/rs232-2-treiber-2-empfaenger-so-16-max-3232-cse-p57869.html?&trstct=pos_0&nbc=1

Ok. Thank you for the hint. I'll keep that in mind 😃

Close this 'issue'?

wavoigt commented 7 months ago

Thx for the ESPHome Integration of Froeling 3200 :-) This is exactly what i've been looking for. I'd not close the issue, so that others are aware of those chinese fake chips.

StyxyDog commented 7 months ago

This Converters may have Chinese Fake MAX3232 Chips, with following consequences: Internal crosstalk on the chip leads to a distorted "echo" on the tx line which may disturb the communication with Froeling 3200!!! see also: https://blog.bogpeople.com/2015/01/fake-max3232-rs232-line-drivers.html

I changed the MAX3232 by the original Maxim part and all worked fine.

Hello, I'm very interested in this project. I have a Froling PE1. I am based in Scotland and I am very nervous of connecting anything to the boiler that may cause an issue. It is very expensive and slow to get Froling parts here from Austria! So maybe I should wait for summer before trying to get involved.

When you say:

distorted "echo" on the tx line which may disturb the communication

is this an issue that might effect the proper operation of the boiler - or even potentially cause damage or is it just an issue on the HA side?

Thank you very much to @wavoigt for raising this issue and of course to @GyroGearl00se for embarking on such a project!

wavoigt commented 7 months ago

Don't worry, this issue only might affect the communication, it won't effect the proper operation of the boiler. It won't cause damage to the boiler.