04775928 is referenced by 51 patents and cites 8 patents.

A hand-held, battery powered, wireless control station transmits alphanumeric characters and control functions to a receiver interfaced with a host computer. The control station includes a microcomputer which converts keyboard signals into a secured character code and transmits the secured character code to a computer interface transceiver using a frequency shift key modulation technique. The keyboard is a multiple function keyboard having plural shift keys allowing several character codes for each key. The computer interface transceiver only recognizes or accepts secured character codes. For the character codes accepted the computer interface transceiver forwards the character to the host computer via an RS 232 interface link. The computer interface transceiver also transmits the secured character code back to the hand-held control station which then displays the characters on a display confirming for the operator receipt of the character by the computer end transceiver. In addition, messages which originate in the computer can be transmitted to the hand-held control station and displayed on the display therein in a secure manner.

Title
Hand-held wireless computer controller system
Application Number
6/793060
Publication Number
4775928
Application Date
October 30, 1985
Publication Date
October 4, 1988
Inventor
Lynn P Kendall
Salina
PA, US
Carroll D Kendall
Salina
PA, US
Assignee
Westinghouse Electric
PA, US
IPC
G06F 1/00
View Original Source