User's Manual

Viewsonic Tweety RF Remote
Rev 2.9A November 05, 2001
Universal Electronics Inc. Confidential Page 17 of 63
CheckSum: The sum of Device Number + Device Address / Status + X-Coordinate + Y-Coordinate/Scan Code.
(Add all the indicated bytes without carry’s).
LEFT/RIGHT MOUSE key Operation
1. When the
<Left>
key is pressed, its corresponding pointing device left key status (Bit 3) in the Device Address / Status Byte will be set.
This bit will be set as long as the <Left> key is held down, and it will be reset (or cleared) when the <Left> key is released.
1.1. While the <Left> key is held down:
a) If the Pointing Device is not active, the transmitted data packet will have Left key status bit in the Device Address / Status Byte
set and the X-Coordinate Byte and Y-Coordinate / Scan Code Byte contained all zeros.
b) If the Pointing Device is
active
, the transmitted data packet will have Left key status bit in the Device Address / Status Byte
set
and the X-Coordinate Byte and Y-Coordinate / Scan Code Byte contained the X and Y positional values of the Pointer movement.
1.2. While the <Left> key is pressed and held down, if another key (other than <Right> key) is now pressed, the pointing device Left key
status bit in the Device Address / Status Byte will be reset.
a) If the Pointing Device is not active, no data packet will be transmitted. Both keys must be released for the remote to return to its
normal operation
b) If the Pointing Device is active prior to the key presses as described in 1.2 above, the transmitted data packet will have Left key
status bit in the Device Address / Status Byte reset and the X-Coordinate Byte and Y-Coordinate / Scan Code Byte contained the
X and Y positional values of the Pointer movement.
2. When the <Right> key is pressed, its corresponding pointing device right key status (Bit 4) in the Device Address / Status Byte will be set.
This bit will be set as long as the <Right> key is held down, and it will be reset (or cleared) when the <Right> key is released.
2.1. While the
<Right>
key is held down:
a) If the Pointing Device is not active, the transmitted data packet will have Right key status bit in the Device Address / Status Byte
set and the X-Coordinate Byte and Y-Coordinate / Scan Code Byte contained all zeros.
b) If the Pointing Device is active, the transmitted data packet will have Right key status bit in the Device Address / Status Byte set
and the X-Coordinate Byte and Y-Coordinate / Scan Code Byte contained the X and Y positional values of the Pointer movement.
2.2. While the
<Right>
key is pressed and held down, if another key (other than
<Left>
key) is now pressed, the pointing device Right key
status bit in the Device Address / Status Byte will be reset.