User's Manual

Viewsonic Tweety RF Remote
Rev 2.9A November 05, 2001
Universal Electronics Inc. Confidential Page 19 of 63
Re-Sync Data Packet
Byte10 Byte09 Byte08 Byte07 Byte06 Byte05 Byte04 Byte03 Byte02 Byte01 Byte0
(MSB)
0x0F 0x0F 0x0F 0x0F 0x55 0x55
0-0x63
(0-99
decimal)
0x00 0x76
(LSB)
0xYY
Sync Bytes Preamble
Device
Number
Dev Addr /
Status
X Coord
Y Coord /
ScanCode
CheckSum
32 bits 16 bits 8 bits 8 bits 8 bits 8 bits 8 bits
How does the Re-Sync operates and When the “Re-Sync” code is sent:
Activating the <Re-Sync> key allows the user to send the “signature data” and to synchronize the RF Transmitter and Receiver RF-channel.
To activate the Re-Sync function:
 Press <Re-Sync> key first.
 While <Re-Sync> key is held down, press a digit key <d> where d is any digit keys from 1, 2, 3, …, 8, 9, 0 representing RF-channel 1,
2, 3, …, 8, 9, 10 respectively.
The process can pictorially be represented as below:
{{ <Re-Sync> + <d> }} <d>
is <Digit> Key for Digit 1, 2, 3, …, 9, 0
Press/Release <d> key, while <Re-Sync> key is held down. The system first sets up “d” RF-channel for RF Transmitter (digit number
corresponding to channel 1 through 10), it then sends out the “Re-Sync” Make code data packet, minimum of 10 or more, as long as key still held
down.
 If the <Re-Sync> and <d> keys are both
released
The “Sleep” code data packet will be sent when no key activities are detected after 5 seconds (Refer to
Sleep Code transmission section for details).
 If another <Digit> key is
pressed/released while the <Re-Sync>
key is still held down
 The system will setup another RF-channel, corresponding to that digit key, for the Transmitter, it then
sends out another “Re-Sync” Make code data packet in that RF channel setting.
 This process will be repeating as above in response to different <Digit> key is pressed/released while
<Re-Sync> key is still held down.
This Re-Sync signature data transmission process will be repeated as described above each time another <Digit> key is pressed/released until
both Transmitter and Receiver units match its selected RF-channel. This channel frequency will then be used to transmit the data packet.