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• The LED tower light that is fully controllable by the PC application program of a PC via a USB port connection

• The USB communication cable is comprise of VCC, D-, D +, GND, and Shield

• Uses 2 DC 5V/500mA rated Personal Computer (PC) USB for its power

• Available on hosts that support USB 1.1 or higher

• Provides MS Runtime libraries for developers to utilize on various PC applications

• Built-in 8-polyphonic clear melody, alarm sound, the type of sound can be chosen when ordered

• Supported OS: WINDOWS XP / WINDOWS 7 (32bit / 64bit)

• Supported Program: VC++, VB, Delphi(32bit), C#(64bit)

Can be connected to the USB port of your PC without any additional power supply

• Qlight’s USB Tower Light is a LED tower lamp connected to a USB interface and controlled

by a PC program. These products work on hosts that support USB 1.1 or higher and allow

up to 4 USB Tower Light connections per PC

• Supports Low speed (1.5Mbps) and Full speed (12Mbps) communication

• Provides MS Runtime libraries for developers(VC ++, VB, Delphi) to utilize in various PC

applications. A sample program (VC ++) is available for testing purposes. The product

uses device drivers in the PC for built-in HID (Human Interface Devices). Therefore, the

operating system (OS) does not need a separate driver to control and to communicate with

the LED Tower Light through the PC application

Native support for 32bit OS, and supports 64bit in Windows XP, Win7. For other OS,

please contact us

1. Basic USB Information

※

Image to the left shows the Tower Light Connections.

Communication

DEVICE

CLASS CODE

INTERFACE

CLASS CODE

Audio Interface

0×00 0×01

Communication Device 0×02 -

HID 0×00 0×00

HUB 0×09 0×09

Storage 0×00 0×08

Monitor Same as HID Same as HID

Print - 0×07

USB is an abbreviation for Universal Serial Bus, a PC peripheral bus stan-

dard developed to satisfy the industries growing need in the mid 1990s for a

new interconnection between computers and electronic devices. Developed

by companies such as Intel, Microsoft, Compaq, IBM, NEC, Nortel, DEC

etc. the USB can connect up to 127 devices without reboot or setup for new

peripherals. Data transfer speed have been improving rapidly.

* HID(Human Interface Devices)?

USB can be applied to various devices and can be classied by its use case. Among them is the USB classication called the Human

Interface Device (HID). These devices can be used to control the PC. A typical HID device includes a mouse, keyboard, joystick, etc.

The data from the devices is sent to the host(PC) by a “interrupt” type IN-endpoint format.

2. Connection

The process of connecting and detecting the device to the USB port is

called “the initial determination”. After “the initial determination” is made,

the host PC requests the device’s specic role and the function is then

specied by the Descriptor. At that moment the device and the PC periodi-

cally exchanges requests, and the descriptor. This process is called “Enu-

meration”. After the nishing the “enumeration” process the PC detects the

device and registers it as a USB Device. When the registration is complet-

ed, the USB Device exchanges data and perform its designated function.

The process how the USB Device is connected to the PC

1. When you connect a USB Device to the PC, Device is powered on.

2. Normally the D+, D- of the PC is on low signal with both D+ and D- having

pull down resistors of 15KΩ.

3. A full speed USB Device has a pull-up resistor of 1.5KΩ hung on D+,

Low speed devices on the other hand have a pull-up resistor of 1.5KΩ

on the D-.

4. Therefore, the PC usually has a low signal on the data line but when the

USB device is connected the PC it detects the high signal of the data line

and noties the host of the USB device connection.

LED Lamp Driver Circuit

Buzzer Circuit

USB Telecommunication Circuit

SMPS(Switching Mode Power Supply)

Full-speed or

Low-speed

USB

Transceiver

Low-speed

USB

Transceiver

Low-speed Function

Slow Slew

Rate Buffers

Host or

Hub Port

Rpd

Rpd=15KΩ±5%

pd=15KΩ±5%

(Normal)

Full-speed or

Low-speed

USB

Transceiver

Full-speed

USB

Transceiver

Hub Upstream Port

Full-speed Function

Host or

Hub Port

Rpd

Z0=90Ω±15%

pd=15KΩ±5%

pd=1.5KΩ±5%

Technical Data for USB Type LED Tower Light