SEJIN ELECTRON, INC
Written by jung ho shim
Version 1.1
Last revised date: March 10, 2009
SEJIN confidential - Copyright© Sejin electron, Inc. 2009.
This Document contains proprietary to Sejin Electron, Inc. Use or disclosure without written
permission from an officer of Sejin is expressly forbidden.
Document number: C00170
Page 7/8
Printed date: March 17, 2009
1. Push the `Connect’ button on the USB Dongle using an appropriate pin in shorten time(less than 2 second), the
red colored indication LED will blink in every other second.
2. Remove the batteries from the keyboard and than press any key to discharge the remains voltage in the internal
capacitors.
3. Reinstall two AA batteries to the keyboard in proper direction. In the time, the keyboard and the USB dongle tries
to communicate and make a wireless connection. The connection will be done within two or three seconds. If the
keyboard has connected successfully, the blinking of the red indication LED on the USB Dongle will stop. The
connection statuses are stored internal non-volatile memory on both the USB dongle and the keyboard. If a
keyboard already had been connected and another keyboard has connected the same USB Dongle, blinking of the
red indication LED will not stop at the time but it will stop after 30 second from the operation. If two or more
keyboards are connected in a USB Dongle, only one keyboard can be used in a same time.
Note: The connecting procedure must be done within 30 seconds, or the connecting process will be canceled
automatically and the user will be required to try again from the step 1.
6.2
Disconnect all keyboards from the USB Dongle and connect a new keyboard
1. Push the `Connect’ button on the USB Dongle using an appropriate pin and hold for about 3 second, the red LED
will blink in every other second.
2. Do the keyboard connecting procedure from step 2.
7 Indication
LED
7.1
Connecting status indication
Green LED indicates the connecting status and it blinks in every other seconds. The LED on and off duty ratio is variable
depends on the keyboard connection status. If no keyboard has been connected, the LED ON time is 10% of cycle time. If
a keyboard has been connected, the LED on time is 50% of cycle time.
7.2
Battery status indication
When the battery voltage on the keyboard is lowered, red indication LED on the USB dongle is blinked during the
keyboard operation. In the case the user will be required to replace the batteries soon.
