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Power + Data using OTG

General chit-chat on the Linx 7

Re: Power + Data using OTG

Postby Niall » February 8th, 2016, 5:38 pm

I've noticed a couple of things, with the Acasis 3 Port OTG Hub on 1, nothing plugged into it, and connected to the charger, when I plug it in, I get the USB attached noise. All USB devices then work when hotplugged. If I dont hear the "jingle" then it charges only.
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Re: Power + Data using OTG

Postby mickael28 » February 16th, 2016, 4:06 pm

nememo wrote:Sorry, completely missed the point of your post there :roll: - it is through a hub and not just a cable.


Hey nememo,

Which hub are you using?

I've seen a couple of links here that seem to work, but they don't mention if they're high powered and the Linx 7" doesn't lose charge slowly...
* Acasis 3 Port OTG Hub
* EasyAcc OTG USB
* Aliexpress OTG Charger HUB cable for Tablet

Is yours any of those 3? or a different one?

Or if someone is using any of those 3, do you notice that your tablet loses charge whilst being used?

Many thanks!
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Re: Power + Data using OTG

Postby minipc » February 22nd, 2016, 3:30 pm

If the tablet discharges very slowly I'd replace the OEM adapter with a 2.4 amp one... depends on what USB devices are connected and also on screen brightness (in my experience anyway). 25% brightness seems to work enabling full charging and multiple USB connections with no discharging once at 100% battery full.

Trial and error...
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Re: Power + Data using OTG

Postby Ueberall » March 6th, 2016, 7:04 pm

You are all using a USB2 Hub to charge your Linx while in OTG mode... DO YOU KNOW THE SPECIFICATIONS OF USB2 ???

:mrgreen: :mrgreen: :mrgreen:
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Re: Power + Data using OTG

Postby trogggy » March 6th, 2016, 7:37 pm

Ueberall wrote:You are all using a USB2 Hub to charge your Linx while in OTG mode... DO YOU KNOW THE SPECIFICATIONS OF USB2 ???

:mrgreen: :mrgreen: :mrgreen:

What's your point?
Plenty of USB hubs break the USB specs. Some even by design.
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Re: Power + Data using OTG

Postby F0LLETT » March 6th, 2016, 11:08 pm

Anyone got OTG working on Vision? I cant get it to work while tablet is turned on.
If I shutdown, it starts charging.
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Re: Power + Data using OTG

Postby Ueberall » March 7th, 2016, 4:46 pm

trogggy wrote:
Ueberall wrote:You are all using a USB2 Hub to charge your Linx while in OTG mode... DO YOU KNOW THE SPECIFICATIONS OF USB2 ???

:mrgreen: :mrgreen: :mrgreen:

What's your point?
Plenty of USB hubs break the USB specs. Some even by design.


My point is 500mA per port!
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Re: Power + Data using OTG

Postby trogggy » March 7th, 2016, 5:45 pm

Ueberall wrote:
trogggy wrote:
Ueberall wrote:You are all using a USB2 Hub to charge your Linx while in OTG mode... DO YOU KNOW THE SPECIFICATIONS OF USB2 ???

:mrgreen: :mrgreen: :mrgreen:

What's your point?
Plenty of USB hubs break the USB specs. Some even by design.


My point is 500mA per port!

If only I'd used a usb ammeter to verify I was getting a lot more than 500mA. :( :oops:

Oh, hang on - I did. :P


Edit: nobody's suggesting you can use any old usb hub.
The '500mA per port!" doesn't apply to the connection between the hub and pc btw.
According to the USB specs a hub should not feed any power back to the computer via the USB interconnect cable.
But these hubs take a walk on the wild side.
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Re: Power + Data using OTG

Postby Ueberall » March 7th, 2016, 7:17 pm

trogggy wrote:If only I'd used a usb ammeter to verify I was getting a lot more than 500mA. :( :oops:

Oh, hang on - I did. :P


Edit: nobody's suggesting you can use any old usb hub.
The '500mA per port!" doesn't apply to the connection between the hub and pc btw.
According to the USB specs a hub should not feed any power back to the computer via the USB interconnect cable.
But these hubs take a walk on the wild side.


I am glad you did and you seem to know what you are doing but does everybody else ???

Is everybody else who is complaining about not being able to charge at 1.4A (that's the max the Linx7 can handle) using the same Hub or cable?

You are aware of, that different cables can handle different currents right... I know you do... but does everybody else know?
Does everyone use a usb ammeter to measure the current between the hub and the tablet?
Are they using different cables that are capable of 1,4 or more Ampere?

If you are using the right (out of specs) Hub and the right Cable (capable of 2A) and measure full load (1,x to 2,x ampere depending on what battery you have) while you have nothing else connected on the Hub (just the tablet), then you can try a 3A or more power adapter.

If not, then the power adapter is not your problem!!!
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Re: Power + Data using OTG

Postby trogggy » March 7th, 2016, 7:30 pm

I think anyone who's read the numerous threads on OTG charging will pick up an understanding. There are specific hubs that work with specific tablets - and the limiting factor is the linx's internal charging circuit, using a 3A adapter doesn't give an advantage.
And yes, cable can make a massive difference.
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