Question about Ultra Products 4-Port USB Hub

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4 Port USB 2.0 Smart Hub Pro with Power Supply Part No. 42999

Dear Sirs
I´m using, since 2007, this Lindy 4 port USB 2.0 HUB connecting throught 2X 5m USB Extension - Active Extension Cables USB 2.0 (part no. 42915) , a VAIO PC to several devices (2 high resolution CCD cameras, one microprocessor linked throught one USB/RS232 converter and another connection to the comand of a DC motor).

Now I decided to change the DC motor command for a stepper motor command for better accuracy.
This one is commanded throught this microprocessor:

- CPU: Atmel AT91SAM7X256
- Power feed - 12V DC
- Connection to the PC - USB 2.0


This works pretty well when directly connected to the PC, without the HUB and the extension cables.
Nevertheless, when connected throught the Lindy active cables and HUB, in spite of the ATMEL CPU being aknowledged and its driver installed with Windows XP (and with no other device connected, neither the cameras neither the other microprocessor) there is no feedback from the motor position and it doesn,t works.
Could it be caused by electric noise interferences?
How can I solve this problem?

Best Regards,

José Cardoso Moura

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  • 787 Answers

Slap a voltmeter on the Power Supply for the USB Hub and make sure it is still working. It really sounds like what happens when you connect a device to a unpowered hub that is not capable supplying enough power.

Posted on Feb 28, 2017

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Posted on Jan 02, 2017

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