Electrical computers and digital processing systems: multicomput – Computer-to-computer protocol implementing – Computer-to-computer data transfer regulating
Reexamination Certificate
2000-07-31
2004-07-06
El-Hady, Nabil (Department: 2154)
Electrical computers and digital processing systems: multicomput
Computer-to-computer protocol implementing
Computer-to-computer data transfer regulating
C709S217000, C709S219000, C709S236000, C341S176000, C341S178000
Reexamination Certificate
active
06760773
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an infrared signal transmission protocol and more particularly to an infrared signal transmission protocol for wireless keyboard and PC remote controller. The protocol identifies the codes transmitted corresponding to various statuses of either keys, or button or pointing device respectively on the wireless keyboard and PC remote controller.
BACKGROUND OF THE INVENTION
Due to the need for wireless communication or control from a wireless keyboard and personal computer (PC) remote controller respectively, wireless keyboard or PC remote controller has been introduced into marketplace recently. As shown in
FIG. 1
, on the personal computer
11
, a conventional infrared signal receiver
110
, an I/O controller
113
having a standard RS-232 port are provided. For instance, the conventional infrared signal receiver
110
may be the type that decodes infrared signal of 940 nm with a 38 KHz carrier. In a well known manner, the output of the receiver
110
is received by the I/O controller
113
through the standard RS-232 port. The input device to the personal computer
11
may include the keyboard
13
and the PC remote controller
15
. Either the keyboard
13
or the PC remote controller
15
is selectively connected to the personal computer
11
wirelessly. In typical, the keyboard
13
has a pointing device
130
, i.e. mouse, and a plurality of keys thereon. In typical, the PC remote controller
15
has a plurality of buttons (functions)
151
, i.e. CD, and a pointing device
153
thereon.
SUMMARY OF THE INVENTION
Under the configuration shown in
FIG. 1
, the present invention provides an infrared signal transmission protocol for the wireless keyboard and PC remote controller such that interference between the other audio/video electronic appliances and the wireless keyboard and PC remote controller are prevented. The transmission protocol provided by present invention not only allows to differentiate the transmission signals generated by the wireless keyboard and PC remote controller from those generated by controllers for other well known electronic appliances, but also encodes into the well known RS-232 format before transmitting to the receiver.
The communication protocol of the keyboard includes a MAKE code and a BREAK code.
The MAKE code is generated when one key is depressed and the BREAK code is generated when one key is released from a depressed condition.
The MAKE code includes a first data and a second data following the first data. The first data is formed by performing exclusive OR (XOR) operation over a parameter and a first ID code.
In a preferred embodiment, the parameter is obtained by summing a key number assigned to the key and a first predetermined constant.
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El-Hady Nabil
Lite-On Technology Corporation
Rosenberg , Klein & Lee
LandOfFree
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