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NMEA / USB wiring - help welcome ! SOLVED at last !
#11
(02-07-2018, 04:18 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.

(02-07-2018, 04:16 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 !
Config : RPi 3, OP 1.0.0 alpha
Cordialement
Didier B





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#12
Hi, can you post a link of yours real rs232 to USB adapter?
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#13
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.


Attached Files
.pdf   connecting vintage NMEA.pdf (Size: 1.69 MB / Downloads: 37)
Config : RPi 3, OP 1.0.0 alpha
Cordialement
Didier B





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#14
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-shi...71350.html
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#15
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
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#16
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]
Config : RPi 3, OP 1.0.0 alpha
Cordialement
Didier B





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#17
(04-09-2018, 03:33 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
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#18
(04-10-2018, 04:48 PM)CVL Wrote:
(04-09-2018, 03:33 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
Hii Christian,
So far it seems to work like a charm ... Wink

bonne nav !
Config : RPi 3, OP 1.0.0 alpha
Cordialement
Didier B





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