1470121 A portable medical data acquisition unit and a corresponding printer having means to receive the unit MEDICAL MONITORS SYSTEMS Inc 6 Aug 1974 [6 Aug 1973] 34585/74 Heading G1N(E) The data acquisition unit Data representing the temperature, the respiration rate and the pulse rate are gated in sequence under the control of a state controller 66, Fig. 3, via a display register 78 and a data multi-plexer 80, to a display 22 and thence via a memory controller 82 to a memory 84. The unit includes means for monitoring the condition of the power supply for restricting the use of the unit if the supply drops below a first threshold and for erasing data from the storage means if the supply drops below a second threshold. The unit housing 20, Fig. 1, has a window display 22 and an array of key board switches. Coupled to the unit is a temperature and respiration rate probe 12 and a pulse rate probe 14. The pulse probe may comprise a light source illuminating, say, a patient's finger and a light sensor is positioned to receive the light transmitted therethrough. The unit is designed to be activated by a signal from the temperature probe 12, containing a thermistor, whenever the temperature rises above 90F, but if the temperature probe is not used, a manual start button 38 is used. In use, when making rounds in a hospital ward, the nurse uses the unit to acquire data from each patient. The transducers corresponding to temperature, respiration rate and pulse rate are connected into respective analogue circuits 60, 62, 64, Fig. 3. The analogue circuits convert the transducer analogue signal into binary coded decimal (B.C.D.) signals. The pulse signals from the pulse analogue circuit 64 are fed into a pulse counter 90 comprising two registers designed to gate pulses from a clock 86 in the interval between the fourth and the twelfth pulse. These gated clock signals are fed to a divider network 92 to provide a number equivalent to the patient's average pulse rate. The output of the respiration analogue circuit 62 is processed in a similar fashion. The temperature transducer in the analogue circuit 60 controls the frequency-of an oscillator, Fig. 4a (not shown), whose frequency signal is transferred to a temperature counter 98 which counts for a fixed period. The resulting count is then directly proportional to the patient temperature. Additional data such as blood pressure may be gathered from one or more external devices 102. The data is shifted in sequence into a display register 78 through the gate 96 under the control of a controller 94 and an external input circuit 104. Each set of data, a binary word, has an identifying character included with it which is also stored in the display register. The data is then presented in the display 22, via a multi-plexer 80, which shows the numerical value and illuminates symbols representing temperature or respiration or pulse &c. If the data is found acceptable by the user the record switch 28 is activated and the data is shifted under the control of memory controller 82 into the memory 84. If the data is unacceptable the repeat switch 30 is depressed to clear the display and a separate measurement is made by the user and entered in by the keyboard 24 which supplies the display register via a keyboard buffer 74 and a gate 76. The sequence of operation of the unit is determined by a state controller 66. The first mode of operation is the identification mode which is indicated by an appropriate light on the display and the patient's identification number is entered in on the keyboard 24, thereafter the pulse mode, the temperature mode and the respiration mode, and any further modes due to external devices, are recorded automatically. Nearly all the block circuit elements shown in Fig. 3 are described in great detail, Figs. 4 and 5 (not shown) at circuit level. The data printer 58, Fig. 2 also Fig. 6 (not shown) is a computer controlled sequential comparison system, (Flow diagrams), Fig. 7 (not shown). The data that has been acquired and stored in the internal-memory 84 of the acquisition unit is transferred to a data printer by loading the unit in a shoot 40 or 42. The data printer then transfers all the body function data to a random access memory and the data is selected and processed via a series of selector buffers and comparators along with two "read only" memories, one of which stores subroutines, and associated address registers. The processed data is then presented to printer interface logic including a trigger magnetic controller generating energizing signals to individual print hammer solenoids for producing the printing action on the labels 18.