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    • 3. 发明授权
    • Link protocol for RS 232 communications
    • LINK 232通讯协议
    • US5142538A
    • 1992-08-25
    • US511333
    • 1990-04-19
    • Stanley L. FickesBernard E. StewartRobert J. GradyRick L. ReaganJohn PicconeRichard C. Allen
    • Stanley L. FickesBernard E. StewartRobert J. GradyRick L. ReaganJohn PicconeRichard C. Allen
    • H04L29/08H04L1/14
    • H04L1/14
    • An infrared RS 232 communication link protocol is particularly suited for correcting any errors introduced during a transmission of information. The information is transmitted from a transmitting station to a receiving station. Each of the stations has a control counter each of which toggles between a logic 0 and 1. The control counter for the transmitter and the receiver are phase locked so that all errors may be corrected. The receiver echoes each data bit back to the transmitter which compares the echoed data to the transmitted data. If there is a match, the transmission was successful. If there is no match, the data must be retransmitted. A retransmit control character RTXx is sent to indicate that the receiver should discard the previous character and prepare for a retransmission of the character having the error. Under the proper circumstances and if the counters are still phase locked, the receiver then discards the previously stored character and inverts the counter. If the receiver detects that it has received an erroneous character, such as one having multiple or no PPM pulses, the receiver will simply respond with the reject control character REJ. In such a case, the transmitter will respond with an RTXx which causes the receiver to discard the previously stored character and invert the counter.
    • 红外RS 232通信链路协议特别适用于校正在信息传输期间引入的任何错误。 信息从发送站发送到接收站。 每个站具有控制计数器,每个控制计数器在逻辑0和1之间切换。发射器和接收器的控制计数器被锁相,从而可以校正所有错误。 接收机将每个数据位回送到发送器,发送器将回波数据与发送的数据进行比较。 如果有匹配,则传输成功。 如果没有匹配,则必须重发数据。 发送重发控制字符RTXx以指示接收者应丢弃先前的字符并准备重发具有该错误的字符。 在适当的情况下,如果计数器仍然锁定,则接收器将丢弃先前存储的字符并反转计数器。 如果接收机检测到它已经接收到诸如具有多个或没有PPM脉冲的错误字符,则接收机将简单地用拒绝控制字符REJ进行响应。 在这种情况下,发射机将以RTXx进行响应,导致接收机丢弃先前存储的字符并反转计数器。
    • 7. 发明授权
    • Infrared network transceiver apparatus
    • 红外网络收发器
    • US5191461A
    • 1993-03-02
    • US702448
    • 1991-05-16
    • Charles L. CranshawJohn PicconeRichard C. AllenJames E. SachermanJohn W. Toor
    • Charles L. CranshawJohn PicconeRichard C. AllenJames E. SachermanJohn W. Toor
    • H04B10/04
    • H04B10/50
    • The present invention is for an illumination transmitter. The transmitter projects a signal onto a planar reflective surface such as the ceiling of an open office environment. The transmitter includes a plurality of illumination sources positioned in a line wherein the line has a predetermined orientation to the planar surface. The illumination sources are preferably infrared LEDs. The transmitter has means for jointly aiming the illumination sources toward a desired location on the planar surface. The location on the planar surface is usually used to allow multiple transmitters coupled to infrared receivers to allow communication between computers in a LAN. The transmitter also includes means for maintaining the predetermined orientation between the planar surface and the line. The orientation is usually parallel to allow transmitters located large distances from the illumination to project a relatively small illumination spot onto the planar surface.
    • 本发明是用于照明发射机。 发射机将信号投影到平面反射表面,例如开放式办公环境的天花板上。 发射器包括定位在线中的多个照明源,其中线具有对于平面表面的预定取向。 照明源优选地是红外LED。 发射机具有用于将照明源联合瞄准平面上的期望位置的装置。 平面上的位置通常用于允许耦合到红外接收器的多个发射器允许LAN中的计算机之间的通信。 发射机还包括用于维持平面和线之间的预定取向的装置。 取向通常是平行的,以允许距离照明器大的距离的发射器将相对较小的照明点投射到平面上。