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Controling USB power with SYSboards (Bad Idea! - Resolved)

 
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neuman5022



Joined: 25 Nov 2005
Posts: 261
Location: Nelson NEW ZEALAND

PostPosted: Thu Jun 21, 2012 4:18 am    Post subject: Controling USB power with SYSboards (Bad Idea! - Resolved) Reply with quote

Hello folks,

Need some help again. . . .

I understand that a USB cable running from the PC to a component, has 4 wires:

Positive and negative for DATA and the same for POWER.


Is it possible, to cut the positive POWER cable, and run it through the SYSboards to activate the power when you hit a switch (or with the relay card?)

Is this safe to do without causing any damage to the data components shooting information without the power ? (Or maybe need to cut both DATA and POWER ?)

Tried to bypass this by using 2 powered hubs, and cut the power to the first hub but it seems the 5V from the PC flows regardless.

Any ideas ?


Many thanks


Isaac
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melnato



Joined: 04 Feb 2006
Posts: 1087
Location: Australia

PostPosted: Thu Jun 21, 2012 6:38 am    Post subject: Reply with quote

GDay Isaac...Im cringing at the thought of this...I hope your card is out of warrany Shocked

If you must ( Smile ), why not connect that USB 5V direcly to "the" switch instead of risking your SYS card?


Nat
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Jetcos



Joined: 30 Sep 2005
Posts: 1214
Location: Newmarket,Ontario

PostPosted: Thu Jun 21, 2012 7:19 am    Post subject: Reply with quote

NO POWER THRU THE SYS CARD SWITCHES!

(No Warranty either)

The switches are just that, triggering an Input to the SYS card. If you want to carry voltage stay away from the SYS card. Use a our Relay card. Or wire it separately.
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Steve Cos
Vice President and Tech Support
Flightdeck Solutions (FDS)
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neuman5022



Joined: 25 Nov 2005
Posts: 261
Location: Nelson NEW ZEALAND

PostPosted: Fri Jun 22, 2012 3:37 am    Post subject: Reply with quote

Steve and Nat, thanks for your reply and twice for the warning.


Perhaps I was not accurate enough.


My aim is to use the SYScard with my FDS Realay card to control this.


I will try to explain it in a diferrent way:

Suppose I have a MCP which is powered only by a USB cable. It means that the MCP and the backllighting are trigerred at the same time. (not like the FDS one I have which has a diferrent wiring for the back-lighting)

Since the USB sends the 5V regardles of SW or even if the PC is on, (As long as the mains power is connected) the back-lighting part is functioning right away.



Is there a safe way to control this - somehow to be able to switch the power component of the USB via a relay or some other way ?

(the idea is to trigger the USB via the BATT SW)



Another question - does the USB use the power part to send the data, or the data is sent regardless of the 5V component of the USB ? (I mean if you cut the 5v wire, does this stop the data flowing forward ?)


I know... questions questions.. but I might learn something here:D

Many thanks

Isaac
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