LK202-24-USB rev 1
10
Warning:
When using the Alternate USB Header, verify all the cable pin outs before applying power. Incorrect
power application may damage the display.
Make sure the host is capable of supplying all the necessary power. Add the LCD power requirement
and the GPO power if used for a total power requirement.
The LK202-24-USB has a secondary power connector used for High Power GPOs. Only if you are planning
on using GPO 4, GPO 5 and GPO 6 as 12V should you plug in a unmodified 3.5” floppy power cable.
Figure 2-2 Power connector
+12 GND GND +5
1 2 3 4
Pin 1
+12.0 VDC (normally from PC
power supply)
Pin 2
Ground
Pin 3
Ground
Pin 4
+ 5.0 VDC (normally from PC
power supply)
Make sure you have sufficient current capacity to handle the desired load. Each High Power GPO can
source over 750mA.
2.1.2 USB Communications
A standard B type USB header is provided on the LK202-24-USB for USB communication. The USB cable
provides power and data to the LCD. There is two ways of communicating to the LCD. Under Windows,
you can have direct access to the LCD by drivers or create a Virtual COM Port (VCP). With the VCP, a
new COM Port gets created in Windows. Under the control panel you can set all the options for the USB
device, including speed. (By changing the speed, you will have to change the speed in the LCD also, so you
have to change the speed settings in two places). Windows 98, Windows ME, Windows 2000 and Windows
XP drivers have been tested and work. VCP drivers are also available for Apple OS-X, OS-8 and OS-9.
Linux drivers are available as well, but have not been testing by us nor will we be able to provide any
support for them.
