Instrumentation & Measurement Magazine 23-9 - 44

describe this resource and how it operates. The transducer
is known by the name stored in the USER'S TRANSDUCER
NAME TEDS. The physical communications media that connects the TIM to the NCAP is described by the PHY TEDS.
The operation of a transducer channel starts with the reception of a trigger signal sent by the NCAP. The following
sampling modes are supported: Trigger-Initiated; Free-running without pre-trigger; Free-running with pre-trigger;
Free-running with pre-trigger without buffers enabled; Freerunning with pre-trigger and buffers enabled; Continuous
sampling mode; and Immediate operation. The pre-trigger
functionality is used in a transducer channel to allow the
acquisition of a predefined number of samples before receiving the trigger to complete the sampling sequence. The
free-running operation means that data acquisitions start as
soon as the transducer channel enters the transducer Operating State. If the transducer channel owns buffers, then it can
continue storing data after it reaches the end of the DataSet
switching among them. The standard defines three different
methods for reading this DataSet: only when commanded;
streamed when the buffer is full; and streamed at fixed time
intervals.

In a smart city, the number of sensors and actuators is high,
and therefore, the amount of data that the sensors/actuators
transfer to the transmission channel is also high. To optimize
the communication channel, a reduction in the amount of data
is necessary so it will not congest the network. Furthermore,
for all wireless sensors and transducers, there is a need to increase the life of the devices. Both the IEEE1451.001 standard
and the IEEE1451.002 standard (under development) help
overcome the two problems just described.

Edge Information Processing with the
IEEE 1451-001-2017
Using the IEEE 1451-001-2017 to Extract and
Compute Information
The representation of a signal by uniform sampling is not
suitable for understanding and does not facilitate knowledge inference processes. Basically, it is due to one reason: it is
unknown which samples carry information and which are redundant. All signals have some degree of redundancy.
Redundancy generates degrees of freedom for interpretation and is necessary to detect errors in the extraction of

Fig. 1. MCT algorithm process.
44	

IEEE Instrumentation & Measurement Magazine	

December 2020



Instrumentation & Measurement Magazine 23-9

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