How do I read and write on the same CAN Port

I have a PXI chassis with a NI PXI 8464 CAN card. I am learning to use this device. I am trying to send messages back and forth between the two ports on the card. I have four simple VIs:ReadWas; WriteWas;ReadSteering; and WriteSteering. I have been starting the read VIs first then starting the write VIs. When I start the write VIs I get an error from CAN init saying I am trying to change an object that is running.
Is it possible to send and receive on the same port of the CAN card without stopping then reinitializing the card?
I have attached ReadWas, ReadSteering and WriteSteering to this post. ReadWas and WriteSteering share a CAN port.
Any help is greatly appreciated,
Thanks,
Phillip
Attachments:
ReadWAS.vi ‏112 KB
ReadSteering.vi ‏143 KB
WriteSteering.vi ‏114 KB

have you looked at this example, (CAN Send & Receieve using NI-CAN Frames) it is in the example code section
http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=E993D9B56C3D2BABE0340003BA230ECF&p_...
http://sine.ni.com/apps/we/niepd_web_display.DISPLAY_EPD4?p_guid=E993D9B56C3D2BABE0340003BA230ECF&p_...
Basically, you are getting the error because the second time you call CANconfig it realizes it is already open. Try consolidating the 2 pieces of code into 1 CAN VI.

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Jossnaz wrote:
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SoundBuffer* soundBufferTemp = [_bufferSoundList objectAtIndex:i];
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kAudioUnitProperty_StreamFormat,
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size);
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kAudioOutputUnitProperty_EnableIO,
kAudioUnitScope_Input,
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kAudioUnitScope_Global,
0,
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sizeof(AURenderCallbackStruct));
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- (void) openFile
OSStatus err;
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NULL,
kAudioFileFlags_EraseFile,
&_extAudioFileRef);
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kExtAudioFileProperty_ClientDataFormat,
sizeof(AudioStreamBasicDescription),
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0,
NULL);
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static OSStatus MyRecorderCallback(void *inRefCon,
AudioUnitRenderActionFlags* inActionFlags,
const AudioTimeStamp* inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumFrames,
AudioBufferList* ioData)
OSStatus err= noErr;
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[auRec allocateAudioBufferList:1 size:inNumFrames*4];
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inActionFlags,
inTimeStamp,
inBusNumber,
inNumFrames,
auRec.audioBufferList);
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inNumFrames,
auRec.audioBufferList);
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Any one has any idea of what could be causing this?
Thanks
Alexandre

Just in case some one might need it, I solved my problem:
I simply needed to initialize the AudioSession before playing/recording. I did so with the following code:
OSStatus err;
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