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SettingtheRS-232TransceiverModewith

DeviceIoControl

TherearetwowaystosetandretrievetheRS-232transceiverstate:

SetandreadtheNI-VISAwiremodeattribute.

TheNI-Serialsoftwareusesprogrammaticcontrolcodesandthe

DeviceIoControlWindowsfunctiontoretrievetheRS-232

transceiverstate.

TosetandretrievetheRS-232transceiverstateusingthe

DeviceIoControlWindowsfunction,completethefollowingsteps:

1. Addthefollowinglinestoyoursourcecode:

#include<winioctl.h>

#include<NiSerial.h>

NoteTheheaderfileNiSerial.hisincludedonyourNI-

SerialsoftwareCD.YoualsocanfinditintheNI-Serial

folderwhereyouinstalledyourNationalInstruments

software(typically,C:\ProgramFiles\NationalInstruments\NI-

Serial).

2. TheTRANSCEIVER_MODEattributecanhavethefollowing

values:

RS232_MODE_DTE

RS232_MODE_DCE

RS232_MODE_AUTO

3. TosettheRS-232transceiver,useNISERIAL_SET_RS232_MODE

andDeviceIoControl.Forexample,tosettoForceDCEmode,

usethefollowingcode:

TRANSCEIVER_MODEl_TransceiverMode=RS232_MODE_DCE;

DWORDl_ByteCount;

DeviceIoControl(

National Instruments PCI-8430 User Manual

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