Campbell-scientific CR800 and CR850 Measurement and Control Systems Manual de usuario descargar pdf (Pagina 205)

100

101

Section 7. Installation

205

+3to+25with‐3to+3defined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CR800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 CR800

Serial Ports

(p. 203) ) 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. 211)

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().

• BaudRrate — Baud rate mismatch is frequently a problem when developing

a new application. Check for matching baud rates. Some developers prefer to

use a fixed baud rate during initial development. When set to -nnnn (where

nnnn is the baud rate) or 0, auto baud-rate detect is enabled. Autobaud is

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