ASTROMECHANICS ASCOM Manual de uso de software y montaje de dispositivos - Página 5

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Note: When testing the ASCOM Lens Controller, first connect it directly to your computer. Then you
can test it with various USB hubs. Keep in mind that connecting both connectors to unpowered
(passive) USB hub doesn't make sense because it is powered from a single computer port. Moreover,
several connected devices can share the power supplied. In this case, the correct functioning of the
device is not guaranteed. Use powered (active) USB hubs for proper operation.
USB cable with dual connector
Powering the device from external power supply