Abstract: A reusable airflow sensor for monitoring respiratory activity of patients in a sleep lab setting comprises a polyvinylidne fluoride (PVDF) film totally encased within a thermally conductive plastic material that is non-hydroscopic and therefore impervious to moisture which allows resterilization without comprising the electrical performance of the sensor.

Abstract: A parallel data bus tester is particularly applicable to SCSI type buses, and uses a plurality of comparator circuits to simultaneously examine the voltages present on the conductors of a bus cable. For twisted pair type conductors, the tester uses a high reference voltage, which is compared to the high voltage conductor of each pair, and a low reference voltage, which is compared to the low voltage conductor of each pair. The reference voltages are adjustable, and allow each reference voltage to be swept through the expected voltage range for its respective conductors. As the level of a reference voltage crosses that of a conductor voltage being examined, a comparator that receives the reference voltage and conductor voltage changes output state. This output is used to drive a corresponding LED assigned to the conductor in question. Thus, as the reference voltage, which is compared to each of its corresponding conductor voltages (i.e.

Abstract: A SCSI bus extender apparatus coupling a main SCSI bus to a auxiliary SCSI bus includes a mechanism for detecting and processing SELECTION and RESELECTION signals transmitted between the two buses to accommodate target devices on the auxiliary bus which support tagged queuing in accordance with the SCSI protocol. The invention contemplates reserving an address on the auxiliary bus for each initiator on the main bus and performing the appropriate address conversions to enable target devices to properly identify the correct initiator device during a RESELECTION phase.

Abstract: A SCSI bus extender apparatus coupling a primary SCSI bus to a secondary SCSI bus includes a mechanism for detecting and resolving contention between a substantially simultaneous SELECTION operation on the primary bus and a RESELECTION operation on the secondary bus. The inventive method contemplates the bus extender arbitrating for control of the primary bus after a conflict is detected, and releasing control of the secondary bus if control of the primary bus is obtained. A target device on the secondary bus can then rearbitrate for control of the secondary bus. Once the target device controls the secondary bus, it can direct a RESELECTION signal to the bus extender, which responsively directs the signal to an initiator device on the primary bus. If the bus extender is unable to gain control of the primary bus after a conflict is detected, the SELECTION operation is allowed to proceed and the target device reattempts to assert the RESELECTION operation thereafter.