Campbell SAT ARGOS Manual de usuario Pagina 163

  • Descarga
  • Añadir a mis manuales
  • Imprimir
  • Pagina
    / 394
  • Tabla de contenidos
  • MARCADORES
  • Valorado. / 5. Basado en revisión del cliente
Vista de pagina 162
ZENO
®
-3200 USER MANUAL
Coastal Environmental Systems (206) 682-6048
Page 155
Sensor Type
Code Name
Specifics
4 Digital Period Measurement, f > 10 kHz
5
Digital Frequency Measurement, f > 10
kHz
The minimum time for a measurement is 100 µs.
The shortest measurable interval is 0.25 µs, or 4
MHz.
6 Digital Period Measurement, f < 10 kHz
7
Digital Frequency Measurement, f < 10
kHz
The maximum time required per measurement is 1
second. The lowest measurable frequency is 1 Hz.
8 Digital State Measurement Measures whether the input is ON or OFF only.
9 Digital Edge Counter
10 Tipping Bucket
16-bit accumulator--up to 65,536 rising edges can be
measured. Tipping Bucket pulses are measured via
processor interrupts meaning that it can wake up the
microprocessor from sleep mode and continue to
count pulses outside of the Sample Duration Time.
14 Differential Encoder
Treats two-wire quadrature shaft encoder using the
16-bit pulse accumulator. Wraps around if more
than 32,767 pulses are read in a single direction.
Resets to its initial value if the ZENO
®
-3200 loses
power. Uses two adjacent digital input channels.
Input the initial value as Line Item #14 (B), change
per pulse as Line Item #15 (C).
10.3.3. Serial Sensor Background
A variety of serial sensors is directly supported by the ZENO
®
-3200.
The ZENO
®
-3200 can communicate with most serial sensors by using the
Universal Serial Interface (USI).
173
Serial sensors can be classified into two general categories:
Polled: the serial sensor transmits data only after receiving a specific instruction to do so.
Asynchronous: the serial sensor transmits data on its own, usually on an internally generated timer.
The ZENO
®
-3200 supports both polled and asynchronous serial sensors. for most asynchronous serial
sensors, a specified amount of time is internally allotted for the ZENO
®
-3200 to wait to receive the
asynchronous message.
174
Serial sensors can also be classified according to their message formats. Unfortunately, NO single
universal standard that defines serial sensor message formats exists. Each serial sensor manufacturer is
free to choose its own message format. Some manufacturers will use a generally used standard such as
NMEA or SDI-12, but many choose to use their own proprietary format. Message formats supported by
the ZENO
®
-3200 include these types:
173
Refer to Section 12.2 for more information about USI.
174
The only exception is the Asynchronous CCSAIL Sensor.
Vista de pagina 162
1 2 ... 158 159 160 161 162 163 164 165 166 167 168 ... 393 394

Comentarios a estos manuales

Sin comentarios