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MPusz
Aquila imperiale
Poland
683 Posts |
 Posted - 16/05/2012 : 08:05:49
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quote:
Originally posted by AlphaLima
Despite our first impression the Cradle cable is not a real RS232.
The Serial Port on the 12Pin connector has 3,3V levels even on the open cable end. So we must use a level shifter 3.3V <-> RS232 (e.g. MAX3232).
I am also REALLY interested in enabling RS-232 in that device. Like Ulli said it is highly possible that 12pin connector has 3,3V signal output exactly in the same way like Mio M400 and other devices have on their mini-USB port. However I believe that the cradle mount and its cables already may have MAX232 build in in that small sealed box on the end of 4-pin serial connector. So probably it may be only OS driver issue to enable the feature. |
Edited by - MPusz on 16/05/2012 08:20:09 |
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mazuk
Falchetto
Germany
112 Posts |
Posted - 16/05/2012 : 08:56:45
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Hi,
I am already in contact with Holux and they will provide an updated Firmware in the next days with com3 enabled!
As soon I get an update I will post it!
Ciao
Mazuk |
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AlphaLima
Moderator
Germany
826 Posts |
Posted - 16/05/2012 : 09:07:26
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quote:
Originally posted by MPusz
quote:
Originally posted by AlphaLima
Despite our first impression the Cradle cable is not a real RS232.
The Serial Port on the 12Pin connector has 3,3V levels even on the open cable end. So we must use a level shifter 3.3V <-> RS232 (e.g. MAX3232).
However I believe that the cradle mount and its cables already may have MAX232 build in in that small sealed box on the end of 4-pin serial connector. So probably it may be only OS driver issue to enable the feature.
No, the open end cradle cable needs a 3.3V to RS232 Converter for sure!!!! I was always talking about the cradle cable not the mini USB connector.
And yes it is a driver issue, my cradle cable already works with a patched firmware on COM3: |
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clouseau
Falchetto
Czech Republic
156 Posts |
Posted - 16/05/2012 : 10:38:09
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GOOD WORK !
Please, can You expose also picture with pinout (12 pins) here, please?
Converter from RS232 to TTL is not a problem...You can buy it, or make himself...
Thank You.
quote:
Originally posted by mazuk
Hi,
I am already in contact with Holux and they will provide an updated Firmware in the next days with com3 enabled!
As soon I get an update I will post it!
Ciao
Mazuk
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PG Axis Polaris - Advance Impress 2 - Brauniger Compeo - GoFlyPico - Vertica V2 - Samsung S WiFi 5 |
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AlphaLima
Moderator
Germany
826 Posts |
Posted - 16/05/2012 : 10:58:50
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You dont need to know the pinning you can easily use the open end cable:
shield: GND
red : DC (+5V)
white : Tx (3,3V)
black : Rx (3,3V)
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clouseau
Falchetto
Czech Republic
156 Posts |
Posted - 16/05/2012 : 11:52:23
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Perfect, thanks!
So, but, please, someone has a diagram of all 12 pins?
Just yet the firmware with support for COM port...
I hope , Holux it will provide fast and free... |
PG Axis Polaris - Advance Impress 2 - Brauniger Compeo - GoFlyPico - Vertica V2 - Samsung S WiFi 5 |
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AlphaLima
Moderator
Germany
826 Posts |
Posted - 16/05/2012 : 12:49:23
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clouseau
Falchetto
Czech Republic
156 Posts |
Posted - 16/05/2012 : 14:12:12
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Thanx !!! |
PG Axis Polaris - Advance Impress 2 - Brauniger Compeo - GoFlyPico - Vertica V2 - Samsung S WiFi 5 |
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mazuk
Falchetto
Germany
112 Posts |
Posted - 16/05/2012 : 14:28:26
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Hi.
the Holux input can handle even regular RS232 comming from an com output of my computer >10V.
The signal at the cradle is limitted to 5V so I don't see a need for any converter.
I have my GT-Altimeter connected directly to the cable and supply the 61cs from the input of the GT-altimeter.
The main power cable of the cradle ist not connected / open.
See:
Ciao
Mazuk
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AlphaLima
Moderator
Germany
826 Posts |
Posted - 16/05/2012 : 15:12:59
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Be careful!!!
That is out of spec, it can overload a driver, increase power consumption and is not granted for every setup. But for sure, it will not work the other way around (e.g. 61CS->FLARM, for tasks declarations). I would absolutely not recommend to do it this way!
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mazuk
Falchetto
Germany
112 Posts |
Posted - 16/05/2012 : 15:58:08
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Hi Uli,
did you scope the signal on the cradle ??
The signal is limitted to 3.3V on the input so it is safe to use it this way!
Ciao
Mazuk |
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AlphaLima
Moderator
Germany
826 Posts |
Posted - 16/05/2012 : 17:44:42
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Yes I did, so the driver needs to drop the 7V, that is an additional load for the driver. If you have a low impedance driver it will drive this load with a high current, heat up and maybe die after a while. So your not killing the PNA but maybe the Logger, Vario... or whatever is connected. Of course it is possible to solve/reduce this by an inline resistor or potential devider. And maybe it is already in the "black box", maybe! You can not rely on it.
And once again, it may work in one direction GPS->PNA but not the other way. The proper way is to use a level shifter (e.g. MAX3232) for both directions.
In your picture you use the GT altimeter, I assume it already has CMOS levels, not RS232!!! So in that case there is no need for a level shifter.
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Edited by - AlphaLima on 16/05/2012 17:54:08 |
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clouseau
Falchetto
Czech Republic
156 Posts |
Posted - 16/05/2012 : 21:15:59
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So.. PNA navigations have serial TTL interface and not fully compatibile RS-232.
Therefore glidertools produce many converters different levels of RS232 to TTL.
Also GT altimeters has a CMOS output (TTL) level, not RS232.
Fully RS232 have only PC and some PDAs, be like my Siemens Pocket LOOX N560.
RS-232 vs. TTL Serial Communication : http://www.sparkfun.com/tutorials/215 |
PG Axis Polaris - Advance Impress 2 - Brauniger Compeo - GoFlyPico - Vertica V2 - Samsung S WiFi 5 |
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Berto
Pterodattilo
Italy
1244 Posts |
Posted - 16/05/2012 : 22:20:35
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If the holux is TTL it is not only a matter of reducing the voltages: RS232 is +12v/-12V with idle at 0V while TTL is +5/0 with idle at 3.3V so just reducing the voltages will give a negative 5V when it should give a 0V, and the idle condition (0 Volts) will be interpreted as 0V that in TTL is a signal transmission.
If the RS232 from the computer works there is something strange, it is not a true TTL. |
Marco Bertoluzza
AVM Voghera
... intanto mettilo a terra, poi parliamo dopo ... |
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mazuk
Falchetto
Germany
112 Posts |
Posted - 17/05/2012 : 08:29:17
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To clarify;
Yes if you connect any other device which needs a real RS232 level signal you need an converter!
However, for just connecting the GT-altimeter you can connect it directly.
The 61CS RS232 has a level range from 3.3 - 5V by Holux.
I like to keep it somehow simple and not having too many devices/boxes with me.
Ciao
Mazuk |
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Topic |
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Holux 61