Instrument Control (GPIB, Serial, VISA, IVI)

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CO bit and DO bits are not setting in NAT 7210

Hi,
 
    I amdeveloping a board with NAT7210 and a microcontroller. I am able to configure NAT7210 as active controller and trying to send the multi line interface messages like DCL to the gpib device. Before the first byte transfer CO bit in ISR2 was set. But after the first byte transfer, inorder for sending the next command, the CO bit is not setting and also the condition of the handshaking lines are as follows:
 
DAV* -not asserted
NRFD*-not asserted
NDAC*- asserted
 
This indicates that the handshaking has not taken place and the device has not accepted the byte, since the controller did not make DAV*low after detecting the NRFD* high.
 
Please helpme to solve this problem.
 
 
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Duplicate post...question is being addressed here:

http://forums.ni.com/ni/board/message?board.id=140&message.id=26692

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