Campbell-scientific CR1000 Measurement and Control System Uživatelský manuál stáhnout pdf (Strana 204)

100

101

Section 7. Installation

204



MarksandSpaces

RS‐232signallevelsareinvertedlogiccomparedtoTTL.Thedifferent

levelsarecalledmarksandspaces.Whenreferencedtosignalground,

thevalidRS‐232voltagelevelforamarkis‐3to‐25,andforaspaceis

+3to+25with‐3to+3defin

edasthetransitionrangethatcontainsno

information.Amarkisalogic1andnegativevoltage.Aspaceisalogic0

andpositivevoltage.

MSB

Mostsignificantbit(theleadingbit).

RS‐232C

Referstothestandardusedtodefinethehardwaresignalsandvoltage

levels.TheCR1000supportsseveraloptionsofseriallogicandvoltage

levelsincludingRS‐232logicatTTLlevelsandTTLlogicatTTLlevels.

RX

Receive

SP

Space

Startbit

Isthebitusedtoindicatethebeginningofdata.

Istheendofthedatabits.Thestopbitcanbe1,1.5or2.

TX

Transmit

7.8.8.5 CRBasic Programming

To transmit or receive RS-232 or TTL signals, a serial port (see table CR1000

Serial Ports

(p. 202) ) must be opened and configured through CRBasic with the

SerialOpen() instruction. The SerialClose() instruction can be used to close the

serial port. Below is practical advice regarding the use of SerialOpen() and

SerialClose(). Program CRBasic example Receiving an RS-232 String

(p. 210)

shows the use of SerialOpen(). Consult CRBasic Editor Help for more

information.

SerialOpen(COMPort,BaudRate,Format,TXDelay,BufferSize)



• COMPort — Refer to CRBasic Editor Help for a complete list of COM ports

available for use by SerialOpen().

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