User's Manual

Viewsonic Tweety RF Remote
Rev 2.9A November 05, 2001
Universal Electronics Inc. Confidential Page 25 of 63
Key Type Data Packet Transmission, a Summary:
All keys including the pointing device buttons are Make/Break type. When a key or button is pressed, the remote will transmit the data packet as shown in the
protocol on previous pages.
For reliable data transmission, keystroke and control push buttons data packets are transmitted twice wirelessly from the Remote Control RF Transmitter. The
transmission is one time for Keep-Alive code and a minimum of 10 times for Re-Sync code.
MAKE
10ms
MAKE BREAK
10ms
BREAK
Followings are some scenarios of key press:
Case of a normal Key pressed/released:
Key Pressed Make Code sent.
Key Released Break Code sent, RF Transmitter turned OFF.
If no key press is detected after 5 seconds, RF Transmitter is turned ON and Sleep Code is sent. After that the RF
Transmitter is again turned OFF and the unit goes to SLEEP mode.
If a key press is detected within 5 seconds, that key data transmission will be serviced as described above.
If a key pressed then stuck for a long time, then Make Code of the same depressed key will be sent for every 70 ms time
interval within 1 minute from the time the original Make code sent. When 1 minute duration is expired, a Stuck code will be
sent, followed by Sleep code and the RF Transmitter is then turned OFF. Note that the software would only be able to go
to STOP (or SLEEP) mode when a stuck key is released.
Case of Make code kept resend
(use <K1> and <K2> as an example):
<K1> pressed Make Code of K1 sent.
<K2> is then pressed while <K1> is still down and both keys are now down within 1 minute. The Make code of K1 will be
sent for every 70 ms time interval as described above, until one of the following conditions occurs:
<K1> is released first while <K2> is still held down. Break code of K1 will be sent and Make code of K2 will be
sent after 70 ms.
<K2> is released first while <K1> is still held down. Nothing changes except the same Make code of K1 will be
sent for every 70 ms time interval. Until <K1> is released and its Break code is sent.