Peripheral data acquisition transmission and control device

• US 5,099,444 A
• Filed: 05/09/1989
• Issued: 03/24/1992
• Est. Priority Date: 05/09/1989
• Status: Expired due to Term

• Current Assignee: Anson Industries Incorporated, I/O Port Systems Partnership
• Original Assignee: Anson Industries Incorporated
• Inventors: Wilson, Dennis A., Williamsen, Mark S.
• Primary Examiner(s): Shaw, Dale M.
• Application Number:
  US07/350,115
• Time in Patent Office: 1,050 Days
• Field of Search: 364/709.01, 364/709.09, 364/709.11, 364/709.12, 364/708, 364/709.02-709.08, 364/709.1
• US Class Current: 708/139
• CPC Class Codes: G06F 3/023 Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
• CPC Class Codes: G08B 25/14 Central alarm receiver or annunciator arrangements

Abstract

The peripheral data acquisition, transmission and control device provides means for inputting information into a computer without having to type the same therein or to receive information from a computer in order to guide various functions, such as manufacturing functions.

Claims

1. A peripheral data acquisition, transmission and control device which is connected between a central processor of a computer and a keyboard thereof for receiving data, such as measurement data, translating said data into code accepted by the central processor and outputting said data in a manner emulating keystrokes to said central processor, said device including:

signal receiving means for receiving signals indicative of any alphabetical, numerical, and control input which can be created on a keyboard;

a microprocessor programmed to translate said received signals into keyboard code signals and having an input thereof connected to an output of said signal receiving means

signal output means connected to an output of said microprocessor for sending the translated code signals to the central processor of the computer;

said signal receiving means and said signal output means comprising a bidirectional data line and;

discrete connector elements for connecting said device to said keyboard and to said central processor.

2. The device of claim 1 being connected to relay switches or other circuit devices for controlling the function of peripheral equipment coupled to an output thereof.

3. The device of claim 2 including special driver software which patches the software of the computer program being utilized, such special driver software trapping incoming response codes, converting them into a format used by the calling software program and returning those values to the calling program.

4. The device of claim 1 including a feedthrough circuit for connecting a power circuit of a keyboard attached to said device to the power circuit of said computer.

5. The device of claim 1 including two modes of operation.

6. The device of claim 5 wherein a first mode of operation is a normal mode, wherein a user of the device has control thereover.

7. The device of claim 5 wherein a second mode of operation is an enhanced mode, wherein the device is self-controlled by a software program.

8. The device of claim 1 including a single chip microprocessor.

9. The device of claim 8 wherein said microprocessor includes a central processor, a random access memory and a read only memory accessible to said central processor, said central processor also being engaged to a clock oscillator controller circuit, at least one interface register and at least one discrete output.

10. The device of claim 9 further including a keyboard interface circuit.

11. The device of claim 10 wherein an eight channel digital input register and an eight channel digital output register are provided and electrically engaged to said microprocessor.

12. The device of claim 11 wherein said input and output registers interact with said interface register counter/timers, thereby providing input to the registers as well as output from the registers.

13. The device of claim 12 further including a digital to analog conversion circuit.

14. The device of claim 13 including an analog input selector which feeds its output to an analog to digital conversion circuit which further feeds a pulse width counter input.

15. The device of claim 14 wherein said pulse width counter output is shunted to the interface register counter/timer.

16. The device of claim 15 wherein an integrated circuit is provided which divides a main clock signal down to a low frequency signal.

18. The device of claim 3 including a single slope analog to digital conversion circuit.

19. The device of claim 18 wherein said single slope analog to digital conversion circuit includes a free running linear ramp generator and a window comparator with an enable input.

20. The device of claim 19 wherein the window comparator is implemented with two comparators, the comparator outputs being connected together in wired-or fashion and pulled up by a resistor.

21. The device of claim 20 wherein said linear ramp generator is implemented with a dual JFET operational amplifier, a quad comparator and a PNP bipolar transistor.

22. The device of claim 21 wherein the output of said window comparator is disabled during ramp reset.

23. The device of claim 22 wherein said linear ramp generator may serve multiple comparators within the device.

24. The device of claim 23 including an analog input conditioning circuit.

25. The device of claim 24 including a PNP bipolar transistor for cutting power supply noise and ripple during the measurement cycle.

26. The device of claim 25 including a diode/resistor circuit to prevent a latchup condition such as would occur when power is supplied to the circuit.

17. In combination with a computer and a keyboard, said computer and said keyboard having respective port means, including respective connector means which, when mated together, provide for engagement of said computer and said keyboard that enables said keyboard to provide alphabetical, numerical, and control data and commands to said computer, a peripheral data acquisition, transmission and control device,

said device comprising its own port means, including its own connector means,

said connector means of said device comprising first means mated with the respective connector means of said computer and said keyboard such that the engagement of said computer and said keyboard is through said device, and second means connected to a source of data other than said keyboard which provides data signals to said device in a format other than the format of signals that said computer will accept from said keyboard,

said device comprising translating means for translating said signals from said source into the same format as that of said signals from said keyboard and transmitting means for transmitting the translated signals to said computer via that portion of said first means which provides for the connection of said computer with said device.

27. A peripheral data acquisition, transmission and control device which is connected between a central processor of a computer and a detached keyboard thereof for receiving data, such as measurement data, translating said data into code acceptable to a central processor of the computer and outputting said data to said central processor in a manner emulating keystrokes accepted by said central processor, said device including:

signal receiving means for receiving signals indicative of any alphabetical, numerical, and control input created on a keyboard;

a programmable single chip microprocessor including a central processor, a random access memory and a read only memory accessible to said central processor, said central processor also being engaged to a clock oscillator controller circuit, at least one interface register and at least one discrete output and having an input thereof connected to an output of said signal receiving means, said microprocessor being programmed to translate said received signals into computer oriented keyboard code signals accepted by the central processor of the computer;

signal output means connected to an output of said microprocessor for sending the translated code signals to the central processor of the computer, said signal receiving means and said signal output means comprising a bidirectional data line;

a digital input register and a digital output register electrically engaged to said microprocessor, said input and output registers interacting with interface register counter/timers, thereby providing input to the registers as well as output from the registers;

an analog to digital conversion circuit;

an analog input selector which feeds its output to said analog to digital conversion circuit which further feeds a pulse width counter input, said pulse width counter output being shunted to the interface register counter/timers;

an integrated circuit which divides a main clock signal down to a low frequency signal which is amplified by amplifier means and provided to the operational amplifier negative supply pin; and

a keyboard interface circuit.

28. The device of claim 27 wherein said read only memory of said microprocessor sets up all internal registers and resets external registers contained in a parallel output circuit.

29. The device of claim 28 wherein said microprocessor further includes an external memory buffer through which data and program instructions from the read only memory are transferred thereto.

30. The device of claim 29 wherein said external memory buffer is multiplexed by way of at least one latch.

31. The device of claim 30 wherein said quad latch includes a resistor/capacitor reset circuit.

32. The device of claim 31 wherein said reset circuit further includes a diode to speed up response when power is removed from the circuit.

33. The device of claim 32 including a nonmaskable interrupt which is actuated by an external switch to signal the single chip microprocessor to take a reading to be sent to the keyboard interface.

34. The device of claim 33 further including an inverter, said inverter providing an enabling signal to be provided to an EPROM of the device.

35. The device of claim 34 including four integrated circuits constituting input and output registers of the device.

36. The device of claim 35 wherein said four integrated circuits expand the eight data lines to eight separate inputs and eight separate outputs.

37. The device of claim 36 wherein said four input circuits comprise two gated input or tristate buffers and two output latches.

38. The device of claim 37 wherein each output latch is a quad latch with both inverted and noninverted outputs.

39. The device of claim 38 wherein said single chip microprocessor executes a preprogrammed algorithm for enabling each of the support chips of its internal architecture to selectively clear any of the output lines and to selectively read any of the input lines.

40. The device of claim 39 including an output filter which receives a pulse width modulated signal on the input line, such signal being variable in duty cycle and pulse repetition rate.

41. The device of claim 40 wherein said variations in duty cycle appear as variations in DC voltage at the output of the integrated circuit filter formed by an operational amplifier.

42. The device of claim 41 including two transistor inverters for serial receive and serial transmit within the device.

43. The device of claim 42 including a serial interface shift register connected to two input lines for entering serial commands and for receiving serial data from the single chip microprocessor.

44. The device of claim 43 including a clamping circuit provided on each input line for clamping input voltages, said clamping circuit including back to back diodes.

45. The device of claim 44 further including small value surge resistors on each of the input lines.

46. The device of claim 45 including an analog to digital inhibit input wherein signals from the analog to digital conversion circuit are prevented from interfering with any pulse width signal presented to the device from outside the device.

47. The device of claim 46 wherein said digital input and output registers comprise low powered Schottkey TTL integrated circuits.

48. The device of claim 47 wherein said eight output lines are conventional totem pole outputs.

49. The device of claim 48 wherein said eight input lines are conventional multiple emitter input circuits.

50. The device of claim 49 wherein only one input buffer is enabled at a time so data does not conflict therein.

51. The device of claim 50 wherein both input buffers are disabled during the outputting of digital data.

52. The device of claim 51 wherein said registers are set with an overall duty cycle and repetition rate for the pulse width modulated output being controlled.

53. The device of claim 52 wherein a square wave is produced by such control and then filtered to produce a DC voltage linearly proportional to a duty cycle of the pulse width modulated output.

54. The device of claim 53 wherein the range of counted external events is unlimited.

55. The device of claim 54 including a counter register which counts any number of pulses to approximately 65,000 at which time an interrupt is generated by the counter register to keep a tally of counter overflows.

56. The device of claim 55 wherein said device can both read data and send data over a single bidirectional data line.

57. The device of claim 56 including structure which will allow key strokes to pass from said keyboard to the CPU of the computer and will allow instructions from the CPU of the computer to be sent through the device back to the keyboard.

58. The device of claim 57 wherein such structure comprises a bidirectional data line.

59. The device of claim 58 including means for connecting several inputs of the analog multiplexer to an analog to digital conversion circuit for measuring the voltage on each input, converting the voltage to a pulse width, converting each pulse width to a decimal ASCII string, converting each string into a series of key codes and sending such key codes to the central processor of the computer, with each measurement being followed by a field delimiter, and with a complete sequence of measurements being followed by a record delimiter.

60. The device of claim 56 including a window comparator.

61. The device of claim 60 including an inverter between the output of the window comparator and the input signal line to the single chip microprocessor.

62. The device of claim 61 including an analog to digital inhibit feature which disables the inverter so that external signals which are positive can be supplied directly to the microprocessor on the line where the typically inverted pulse width coming out of the window comparator is transported.

63. A method of using a device

comprising signal receiving means for receiving electrical signals from outboard devices communicating therewith, a microprocessor having an input thereof connected to an output of said signal receiving means, the microprocessor translating said received signals into computer oriented alphabetical, numerical and control keyboard code signals accepted by a central processor of a computer, and signal output means connected to an output of said microprocessor for sending the translated code signals to the central processor of the computer;

said method including the steps of;

receiving an electrical signal;

performing an algorithm to provide a number of equivalent millivolts for said signal; and

producing a binary value establishing an exact number of millivolts, said signal being converted through algorithms to a decimal value which is in turn converted to a text string to be transmitted to the central processor of the computer.

64. The method of claim 63 further including the steps of reading a pulse width of pulses present on an input line, sensing a complete pulse, measuring its width and calculating the related input voltage, the input voltage being converted to ASCII test in a scratch pad memory of the microprocessor.

65. The method of claim 64 wherein said ASCII text is then converted to key codes appropriate for a program with which the device is being utilized.

66. The method of claim 65 including timer registers which are within the microprocessor, one timer register for storing the number of microseconds for which an output is high and the other register for storing the number of microseconds for which the output is low.

67. The method of claim 66 further including the step of attenuating said signal and connecting said signal to an input selector.

68. A device for use in acquiring and transmitting data to a central processor of a computer and using a response to same generated by said central processor for controlling an outboard peripheral apparatus using a keyboard interface of said computer, without need of a computer keyboard, said device including:

signal receiving means for receiving signals indicative of any alphabetical, numerical, and control input;

a microprocessor having an input thereof connected to an output of said signal receiving means, said microprocessor being programmed to translate said received signals into computer oriented keyboard code signals accepted by a central processor of the computer;

signal output means connected to an output of said microprocessor for sending the translated code signals to the central processor of the computer;

said signal receiving means and said signal output means comprising a bidirectional data line; and

means for receiving signals from said central processor of said computer and translating said signals into usable code for controlling peripheral devices communicating therewith in response to said received signals.

69. The device of claim 68 including a programmable asymmetrical pulse width output.

70. The device of claim 69 including a system for translating incoming signals into ASCII characters.

71. The device of claim 70 including a plurality of output registers for controlling devices attached thereto.

72. A peripheral data acquisition, transmission and control device connected to a keyboard interface of a computer said device comprising:

signal receiving means for receiving signals indicative of any alphabetical, numerical and control input;

a microprocessor having an input thereof connected to an output of said signal receiving means, said microprocessor translating said received signals into computer oriented keyboard code signals accepted by a central processor of the computer;

signal output means connected to an output of said microprocessor for sending the translated code signals to the central processor of the computer;

means for allowing communication between a keyboard and said computer via said device; and

means for allowing communication between said computer and outboard peripheral devices electrically coupled to outputs of said device.