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CyberData Corporation 930105A Operations Guide
Installing and Using the 4-Port PoweredUSB Hub
Operation
12
2.4 Operation
The CyberData 4-Port PoweredUSB 2.0 Hub with Serial Ports is a standard USB Hub that complies
with the USB 2.0 specification, and adds PoweredUSB ports. When connected to a Host, it is
enumerated as a Generic USB Hub. This Hub also meets the PoweredUSB .08g specification. For
more information about this specification, go to www.poweredusb.org.
POS peripheral
caveat
According to the USB 2.0 specification, devices attached to a USB interface should enumerate from
the Hub’s USB Vbus, regardless of the PoweredUSB powered ports. Some POS devices do not
comply with this specification, and will not enumerate unless the upper sections of the PoweredUSB
ports are active.
When running on operating systems such as Windows XP with no devices attached (an empty Hub),
the operating system turns the Hub off. The operating system does not detect non-compliant
peripherals when they are hot-plugged into an empty Hub. Consequently PoweredUSB power is
not supplied to the peripheral. In this case, you can restore correct operation as follows.
1. Unplug the Host side connection for five seconds, and then plug it in again.
2. Be sure that at least one USB device is plugged in when the computer is booted, or leaves
standby mode.
3. Plug in a standard USB compliant device, such as a mouse or keyboard.
4. Disable the low-power, standby operation. With this configuration, power is always supplied to
the PoweredUSB ports regardless of the PC’s operational state. For more information, contact
CyberData as instructed in
Section , "Contact Technical Support".
2.5 Port Electrical Specifications
The CyberData 4-Port PoweredUSB 2.0 Hub with Serial Ports adheres to the USB 2.0 electrical
specifications as follows:
Standard USB
lower A supply
Each lower portion of the PoweredUSB port provides +5V @ 500mA. If more than 500mA are drawn
from a port, that port goes into USB over current, the +5 volts is turned off, and the condition is
reported to the host according to USB 2.0 specifications.
PoweredUSB
supply
The listed maximum currents depend on the selected power supply. Both the +12V and +24V
PoweredUSB ports are protected with active over current circuits. If an over current condition
occurs, unplug the DC connection, remove the overcurrent condition, and re-cycle the DC
connection to the Hub by unplugging it, and then plugging it in again.
● +12V Ports (3) – 1.5A each
● +24V Port (1) – 2.3A