Campbell-scientific CR3000 Micrologger Uživatelský manuál stáhnout pdf (Strana 208)

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Section 7. Installation

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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

Indicatesthesendingandreceivingdevicesarenotsynchronizedusinga

clocksignal.

Baudrate

Therateatwhichdataaretransmitted.

BigEndian

"Bigendfirst."Placingthemostsignificantintegeratthebeginningofa

numericword,readinglefttoright.

cr

Carriagereturn

Databits

Numberofbitsusedtodescribethedata,andfitbetweenthestartand

stopbits.Sensorstypicallyuse7or8databits.

Duplex

Canbehalforfull.Full‐duplexissimultaneous,bidirectionaldata.

lf

Linefeed

LittleEndian

"Littleendfirst."Placingthemostsignificantintegerattheendofa

numericword,readinglefttoright.

LSB

Leastsignificantbit(thetrailingbit)

1 2 ... 203 204 205 206 207 208 209 210 211 212 213 ... 589 590

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