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    • 3. 发明授权
    • Digital multimeter with microprocessor control
    • 带微处理器控制的数字万用表
    • US5396168A
    • 1995-03-07
    • US858799
    • 1992-03-27
    • Jerry J. HeepFrank P. Mimick
    • Jerry J. HeepFrank P. Mimick
    • G01R15/12G01R1/00G01R19/26
    • G01R15/125
    • A digital multimeter includes a microprocessor control and a keyboard input. The microprocessor functions to control the display of parameters measured by the meter and displays such measured parameters. The keyboard includes switches to allow the user to select a parameter which is desired to be measured as well as a range of values for that parameter for use in measuring parameters of a device under test connected to the multimeter. The microprocessor communicates with the keyboard and functions to control a resistor and switch network to configure the multimeter to test selected parameters within selected ranges. The multimeter incorporates an overload protection function which compensates for an over-large voltage on the input leads of the multimeter, thus preventing damage to the circuit and to the multimeter.
    • 数字万用表包括微处理器控制和键盘输入。 微处理器用于控制由仪表测​​量的参数的显示,并显示这些测量参数。 键盘包括开关以允许用户选择期望测量的参数以及该参数的值的范围,用于测量连接到万用表的测试设备的参数。 微处理器与键盘进行通信,并用于控制电阻和开关网络,以配置万用表来测试选定范围内的选定参数。 万用表包含一个过载保护功能,可以补偿万用表输入引脚上的过大电压,从而防止损坏电路和万用表。
    • 5. 发明授权
    • Computer and peripheral interface circuit
    • 电脑和外设接口电路
    • US4440987A
    • 1984-04-03
    • US335554
    • 1981-12-29
    • Jerry J. HeepPaul Schreiber
    • Jerry J. HeepPaul Schreiber
    • H04L27/156H04L27/14
    • H04L27/1563
    • An interface circuit is disclosed for connecting a digital computer to a modem or other peripheral circuit through either a standard digital signal (RS232) "port" or an audio-frequency "port" normally used by the computer to store and retrieve information on audio-frequency magnetic tapes. The interface circuit allows the modem to be used economically with a small computer which does not have a standard RS232 "port". In order to allow the modem to connect to the audio-frequency "port" the interface circuitry combines filtered audio signals received by the modem from an associated telephone line with RS232 signals generated by the modem decoding circuitry to produce tone bursts which can be decoded by the computer audio-frequency port. The interface circuitry can accept either RS232 signals or tone bursts from the computer to be transmitted by the modem by automatically adjusting an internal threshold level.
    • 公开了一种接口电路,用于通过计算机通常使用的标准数字信号(RS232)“端口”或音频“端口”将数字计算机连接到调制解调器或其他外围电路,以存储和检索关于音频 - 频率磁带。 接口电路允许调制解调器与没有标准RS232“端口”的小型计算机经济地使用。 为了允许调制解调器连接到音频“端口”,接口电路将来自相关联的电话线路的调制解调器接收的滤波音频信号与由调制解调器解码电路产生的RS232信号相组合,以产生可以由 电脑音频端口。 接口电路可以接受来自计算机的RS232信号或音调脉冲串,以通过自动调整内部阈值电平由调制解调器发送。
    • 6. 发明授权
    • Method for transferring data between devices by generating a strobe
pulse and clamping a clock line
    • 通过产生选通脉冲并夹紧时钟线来在设备之间传送数据的方法
    • US5898890A
    • 1999-04-27
    • US908771
    • 1997-08-07
    • Jerry J. HeepDouglas R. Curtis
    • Jerry J. HeepDouglas R. Curtis
    • G01R15/12G06F13/42G06F1/04G06F13/38
    • G06F13/4291G01R15/125
    • A first and second electronic devices are connected by two data lines arranged in a wired-AND configuration so that each device can signal the other device by forcing one of the two-wires into a "low" condition. An inventive method uses serial transfer of a predetermined numbers of bits in a digital word delimited by start and stop bits which are, in turn, defined by their relation to a clock signal on one of the data lines. The start and stop bits are chosen to be in a particular state during the "active" portion of the clock signal. Thus, the need for clocked gates or multivibrators is eliminated. In the preferred embodiment, the method and apparatus are used in a digital multimeter to intercouple a microprocessor and an electronic measuring circuit so that the microprocessor can control the measuring circuit and receive measured values from the circuit.
    • 第一和第二电子设备通过以线对准配置布置的两条数据线连接,使得每个设备可以通过将两条线中的一条强制为“低”状​​态来发信号通知另一设备。 本发明的方法使用由开始和停止位限定的数字字中的预定数量的位的串行传送,而这些位又由它们与数据线之一上的时钟信号的关系所限定。 选择起始位和停止位在时钟信号的“有效”部分处于特定状态。 因此,消除了对时钟门或多谐振荡器的需要。 在优选实施例中,该方法和装置用于数字万用表中以相互耦合微处理器和电子测量电路,使得微处理器可以控制测量电路并从电路接收测量值。
    • 7. 发明授权
    • Overvoltage protection for battery powered equipment
    • 电池供电设备的过压保护
    • US5606481A
    • 1997-02-25
    • US311904
    • 1994-09-26
    • Jerry J. HeepDouglas R. Curtis
    • Jerry J. HeepDouglas R. Curtis
    • G01R1/36G01R15/12H02H9/04
    • H02H9/046G01R1/36G01R15/125
    • An overvoltage protection circuit for a CMOS electronic multimeter circuit uses a pair of complementary field-effect protection transistors connected to each input line of the meter circuit. The gate electrodes of the protection transistors are connected to bias voltage sources which provide bias voltages with magnitudes slightly less than the meter power supply voltages. The protection transistors go into conduction when an overvoltage condition causes the voltage on the input to exceed the bias voltages and the conducting protection transistors clamp the input voltage to substantially the bias voltage. Current caused by an overvoltage condition is shunted to ground thereby avoiding a charging condition in the power supplies.
    • 用于CMOS电子万用表电路的过电压保护电路使用连接到仪表电路的每个输入线的一对互补场效应保护晶体管。 保护晶体管的栅电极连接到偏置电压源,偏压电压提供的量程略小于仪表电源电压。 当过电压状态导致输入端的电压超过偏置电压时,保护晶体管导通,导通保护晶体管将输入电压钳位到基本上的偏置电压。 由过压状态引起的电流被分流到地,从而避免电源中的充电状况。
    • 10. 发明授权
    • Modem
    • 调制解调器
    • US5295156A
    • 1994-03-15
    • US745014
    • 1991-08-14
    • Jerry J. HeepStephen S. Mosher
    • Jerry J. HeepStephen S. Mosher
    • H04B1/38H04L5/16H04L27/00H04L29/08H04L29/10H04M11/00H04M11/06
    • H04M11/06H04L27/00
    • Method and apparatus for effecting mode switching from a transmission mode to a command mode of an intelligent modem operatively coupled to a digital data device and a telephone line is disclosed. A termination of the modem's transmission mode is effected after a predetermined silent time interval in which no data is received from the device and prior to the transmission of additional data on the line. Operation of the modem switches to a buffer mode in which data sent from the device is temporarily stored instead of being transmitted on the telephone line. If the stored data is a proper escape sequence, operation of the modem switches to the command mode. If a proper escape sequence is not received, operation of the modem switches to a purge mode in which the stored data is transmitted on the telephone line. The apparatus comprises a data interface, a novel modem controller and a modem engine. The modem controller includes the data buffer for storing the data received from the digital data device when operating in the buffer mode.
    • 公开了用于实现从传输模式到可操作地耦合到数字数据设备和电话线路的智能调制解调器的命令模式的模式切换的方法和装置。 调制解调器的传输模式的终止在其中没有从设备接收到数据并且在线路上传输附加数据之前的预定的无声时间间隔之后进行。 调制解调器的操作切换到暂停存储从设备发送的数据而不是在电话线上发送的缓冲模式。 如果存储的数据是正确的转义序列,则调制解调器的操作切换到命令模式。 如果没有接收到正确的转义序列,则调制解调器的操作切换到清除模式,在该模式下,存储的数据在电话线路上传输。 该装置包括数据接口,新型调制解调器控制器和调制解调器引擎。 调制解调器控制器包括用于在以缓冲器模式操作时存储从数字数据设备接收的数据的数据缓冲器。