12Installing and Using the 4-Port PoweredUSB Hub Operation

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 According to the USB 2.0 specification, devices attached to a USB interface should enumerate from

caveat 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".

2.5Port 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 Each lower portion of the PoweredUSB port provides +5V @ 500mA. If more than 500mA are drawn lower A supply 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 The listed maximum currents depend on the selected power supply. Both the +12V and +24V

supplyPoweredUSB 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

CyberData Corporation

930105A

Operations Guide