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+--- Thread: NMEA / USB wiring - help welcome ! SOLVED at last ! (/showthread.php?tid=1003)
RE: NMEA / USB wiring - help welcome ! - Didier B - 2018-03-30
(2018-02-07, 09:18 AM)shipahoy Wrote: The ST50 is probably so old that it uses NMEA 0183 version 1. This is not RS422 but RS232.
You should try with a USB-RS232 converter (preferebly isolated). Remember to set the baudrate to 4800 baud.
(2018-02-07, 09:16 AM)marko_st Wrote: - on transmiter side is ST50 which have TTL(UART) output
That mean you need UART to USB converter between this two parts.
I am quite sure that this would destroy the UART to USB converter because it only handles 0 to 3.3 or 5 V, and this output is probably ±12 V.
For RS232, shipaoy you are sure right !
I could eventually read the ST50 NMEA sentences on the inspector windows, using a real RS232 to USB adapter !
(and not an RS232 "TTL" !) .
Regarding the version, actually (i.e. since 2008) NMEA is in version 4.x My GP32 Furuno is using version 2, with RS232 (2006) !
The problem with NMEA is that they seem so money minded that they try to sell any bit of information, beurk, pouah ! I lost 2 months ! It sucks !
****************************************** Lets support actively signal K !!! **************************************************
By the way, the same RS232 adapter works fine with my GP32 !
That point is solved, makes me feel much better !
RE: NMEA / USB wiring - help welcome ! SOLVED at last ! - cepicscepics - 2018-04-08
Hi, can you post a link of yours real rs232 to USB adapter?
RE: NMEA / USB wiring - help welcome ! SOLVED at last ! - Didier B - 2018-04-09
Yes, I even wrote an article on the matter, I attach it to this post. EDIT : added a correction in the pdf
I got this RS232 to USB adapterr from ebay.
RE: NMEA / USB wiring - help welcome ! SOLVED at last ! - shipahoy - 2018-04-10
If you want a higher quality adapter, this isolated converter works both for RS422 and RS232, and is very robust:
https://www.aliexpress.com/item/free-shipping-Magnetic-coupling-isolating-converter-USB-to-RS485-USB-to-RS232-USB-to-RS422-Three/32734271350.html
RE: NMEA / USB wiring - help welcome ! SOLVED at last ! - jim321 - 2018-04-10
says free shipping in the title then ....
Price:US $43.00 / piece
Shipping:US $52.72 to United States
Total Price:US $95.72
On-time Delivery
27 days
shipping is more than the part..lol
RE: NMEA / USB wiring - help welcome ! SOLVED at last ! - Didier B - 2018-04-10
Well, if you are not in a hurry, and can wait for a month , you can have
this one. (98% cheaper !)
[url=https://www.ebay.fr/itm/New-9Pin-Male-Adapter-Cable-VGA-PC-Mobile-Phone-USB-2-0-to-RS232-Serial-DB9/222811477466?hash=item33e09955da:g:49gAAOSwzRFaavXi][/url]
RE: NMEA / USB wiring - help welcome ! SOLVED at last ! - CVL - 2018-04-10
(2018-04-09, 08:33 AM)Didier B Wrote: Yes, I even wrote an article on the matter, I attach it to this post. EDIT : added a correction in the pdf
I got this RS232 to USB adapterr from ebay.
Bonsoir Didier,
is the ch340 driver stable in jessie/ stretch ? I heard they are cheaper versions of the prolific or ftdi chips ...
bon vent
Christian
RE: NMEA / USB wiring - help welcome ! SOLVED at last ! - Didier B - 2018-04-11
(2018-04-10, 09:48 PM)CVL Wrote:Hii Christian,(2018-04-09, 08:33 AM)Didier B Wrote: Yes, I even wrote an article on the matter, I attach it to this post. EDIT : added a correction in the pdf
I got this RS232 to USB adapterr from ebay.
Bonsoir Didier,
is the ch340 driver stable in jessie/ stretch ? I heard they are cheaper versions of the prolific or ftdi chips ...
bon vent
Christian
So far it seems to work like a charm ...
bonne nav !
RE: NMEA / USB wiring - help welcome ! SOLVED at last ! - Stevendark - 2018-06-26
Thank you so much for figuring this out! My advansea equipement now totally visible via mnea!
RE: NMEA / USB wiring - help welcome ! SOLVED at last ! - topodom - 2020-12-06
(2018-04-09, 08:33 AM)Didier B Wrote: Yes, I even wrote an article on the matter, I attach it to this post. EDIT : added a correction in the pdf
I got this RS232 to USB adapterr from ebay.
Thanks a lot Didier for the article !
I just want to complete something : you titled your document "Connecting 'legacy' (15y +) NMEA devices to your Rpi"
Actually it's not useful only for old devices. I bought a Nasa clipper wind system on year ago. I was not able to get the NMEA sentences on my OP system with my usb rs 486/422 converter until i sent an e-mail to Nasa support. They told me that the inteface is RS 232. So i tried to connect it following your article instructions. Now it's working like a charm !
I can now get the wind speed and direction.
Next step building a pypilot auto-pilot !
