Campbell-scientific CR1000 Measurement and Control System Manual de usuario Pagina 203

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Section 7. Installation
203
Note If an instrument or sensor optionally supports SDI-12, Modbus, or DNP3,
consider using these protocols before programming a custom protocol. These
higher-level protocols are standardized among many manufacturers and are easy
to use, relative to a custom protocol. SDI-12, Modbus, and DNP3 also support
addressing systems that allow multiplexing of several sensors on a single
communications port, which makes for more efficient use of resources.
7.8.8.4 Glossary of Terms
Asynchronous
Indicatesthesendingandreceivingdevicesarenotsynchronizedusinga
clocksignal.
Baudrate
Therateatwhichdataaretransmitted.
BigEndian
"Bigendfirst."Placingthemostsignificantintegeratthebeginningofa
numericword,readinglefttoright.
cr
Carriagereturn
Databits
Numberofbitsusedtodescribethedata,andfitbetweenthestartand
stopbits.Sensorstypicallyuse7or8databits.
Duplex
Canbehalforfull.Fullduplexissimultaneous,bidirectionaldata.
lf
Linefeed
LittleEndian
"Littleendfirst."Placingthemostsignificantintegerattheendofa
numericword,readinglefttoright.
LSB
Leastsignificantbit(thetrailingbit)
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