Campbell Measurement and Control Module CR10 Operator's Manual page 219

APPENDIX A. GLOSSARY
PRINT PERIPHERAL: See Print Device.
PROCESSING INSTRUCTIONS: These
Instructions allow the user to further process
input data values and return the result to Input
Storage where it can be accessed for output
processing. Arithmetic and transcendental
functions are included in these Instructions.
PROGRAM CONTROL INSTRUCTIONS:
Used to modify the sequence of execution of
Instructions contained in Program Tables; also
used to set or clear flags.
PROGRAM TABLE: That portion of memory
allocated for storing programs consisting of a
sequence of user instructions which control
data acquisition, processing, and output to Final
Storage. Programming can be separated into 2
tables, each having its own user-entered
Execution Interval. A third table is available for
programming subroutines which may be called
by instructions in Tables 1 or 2. The *1 and *2
Modes are used to access Tables 1 and 2. The
*3 Mode is used to access Subroutine Table 3.
The length of the tables is constrained only by
the total memory available for programming
(Section 1.5). Tables 1 and 2 have
independent execution intervals. Table 1
execution has the higher priority; it may
interrupt Table 2.
RING LINE (PIN 3): Line pulled high by an
external device to "awaken" the CR10.
SAMPLE RATE: The rate at which
measurements are made. The measurement
sample rate is primarily of interest when
considering the effect of time skew (i.e., how
close in time are a series of measurements).
The maximum sample rates are the rates at
which measurements are made when initiated
by a single instruction with multiple repetitions.
A-4
SIGNATURE: A number which is a function of
the data and the sequence of data in memory.
It is derived using an algorithm which assures a
99.998% probability that if either the data or its
sequence changes, the signature changes.
SYNCHRONOUS: The transmission of data
between a transmitting and receiving device
occurs as a series of zeros and ones. For the
data to be "read" correctly, the receiving device
must begin reading at the proper point in the
series. In synchronous communication, this
coordination is accomplished by synchronizing
the transmitting and receiving devices to a
common clock signal (see Asynchronous).
THROUGHPUT: The throughput rate is the
rate at which a measurement can be made,
scaled to engineering units, and the reading
stored in Final Storage. The CR10 has the
ability to scan sensors at a rate exceeding the
throughput rate (see SAMPLE RATE). The
primary factor affecting throughput rate is the
amount of processing specified by the user. In
normal operation, all processing called for by
an instruction must be completed before
moving on the next instruction. The maximum
throughput rate for a fast single-ended
measurement is approximately 192
measurements per second (12 measurements,
repeated 16 times per second). This rate is
possible if the CR10's self-calibration function is
suspended (this is accomplished by entering
Instruction 24 into Program Table 2 while
leaving the Execution Interval 0 so Program
Table 2 never executes).
When the self-calibration function is operating,
the maximum throughput rate for a fast, single-
ended measurement is 192 measurements per
second (12 measurements, 16 times per
second).