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MihaiR avatar image

RS485 isolated converter

Hi

Can someone please recommend me a Venus OS compatible USB to iso RS485 dongle?

Thanks,

Mihai

Venus OSrs485
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3 Answers
mvader (Victron Energy) avatar image
mvader (Victron Energy) answered ·

Hey; since v2.20 we added the “Hjelmslund Electronics USB to RS485 Iso converter” to the software. Thats the one I recommend.


https://hjelmslund.eu/


They have different models (one with a connector, one with wire endings, one with a modbus connector). From top of my head; i dont think that the latter is useful.

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Peter Polz avatar image Peter Polz mvader (Victron Energy) ♦♦ ·

thx for info, very good to know

WKirby avatar image WKirby ♦♦ mvader (Victron Energy) ♦♦ ·

Those look nice.

As a coincidence, look what came in on my "junk" email today.
It is based on FT232R (same as the Victron one) so maybe it will work. It is isolated too.
https://www.seeedstudio.com/USB-TO-RS232-RS485-TTL-Industrial-Isolated-Converter-p-3231.html


Go with the one Matthijs recommends if you want to be sure.


@WKirby Thank you so much!

I already ordered two pcs. That's a marvoulose device, it can be used for taping on RS232 any protocol traveling on RS485 physical infrastructure.

Be aware that it might not work out of the box with our energy meters.


For those; use the approved rs485 usb cables: either the non isolated one that we ship; or the isolated one referenced earlier in this thread.

@MihaiR have you got running the USB TO RS232 / RS485 / TTL Industrial Isolated Converter with energy meters and GX device?

Thanx & Regards Mot

Without any problem, for more than a year. I have two em111 connected on the same bus, one as a grid meter and the other one as pv inverter meter

laurentiu.pitran@gmail.com avatar image
laurentiu.pitran@gmail.com answered ·

hi,

DS_USB_RS485_CABLES (1).pdfpersonal i use this one


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This cable is not galvanicaly isolated

These work perfectly never had a issue to date

The problem is not if it works or not but how will behave when something bad happens, like a power surge in rs385 bus. A nonisolated adapter will take out the venus device

Peter Polz avatar image
Peter Polz answered ·

As @WKirby said take the orginal victron usb. If you want to add an isolation just search in google for "485 repeater galvanic isolation". There are many on market. Just put it between to isolate signals


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