UBS HUB: Is it possible?

Community Playground General Discussions
1

Hi All,

I have a USB UIRT connected to my VERA via USB.

Now I would like to connect an RFID using the dedicated luup plugin.

Question: can I connect both device using an USB HUB?

Thank you
Regards,
Matteo

2

Should not be an issue. I know others have done it.

  • Garrett
3

I’ve done it in the past, you just need to be aware that things can get screwed up if you try to draw too much power or attach too many devices. I recommend a powered hub for this reason!

4

I have an unpowered USB hub attached with a couple of devices hanging off it, and all works fine.

5

I think the limit is somewhere between 3 and 4 depending on the type of device.

6

Typically a USB Port is rated at 500mA. The small Hubs I use consume 100mA leaving the rest to be cut-up between each of the attached devices.

I can normally run 2x non-powered USB-Serial ports, as well as the FTDI Serial port from my Alarm system. Adding in my USB-GSM device takes it over the edge due to the current draw… mostly when I transmit stuff.

You might be able to draw more current, but it’s unpredictable what’ll happen if you do. I’ve certainly sent Vera into a tail-spin doing that.

7

Further to guessed’s comment the wall-wart that came with my Vera is rated at 1A, You might possibly get further if you put a meatier 12V PSU on there.