Connecting Signals - National Instruments 653 Series User Manual

Transfer
Direction
Input
ND_READ_MARK_H_SNAPSHOT_GR1
ND_READ_MARK_H_SNAPSHOT_GR2
ND_READ_MARK_L_SNAPSHOT_GR1
ND_READ_MARK_L_SNAPSHOT_GR2
Output
ND_WRITE_MARK_H_SNAPSHOT_GR1
ND_WRITE_MARK_H_SNAPSHOT_GR2
ND_WRITE_MARK_L_SNAPSHOT_GR1
ND_WRITE_MARK_L_SNAPSHOT_GR2
You should always read the least significant bits of the transfer count before reading
Note
the most significant bits. The 32 most significant bits of the transfer count is cached in
software when you read the least significant bits.

Connecting Signals

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Attribute
• LabVIEW—Use the Digital Buffer Write VI or the Digital Buffer
Read VI, which are called by the DIO Read VI, the DIO Write VI, and
the DIO Wait VI.
Connect digital input signals to the I/O connector using the pinout
diagrams, Figure C-1,
Figure C-2, 68-to-50-Pin Adapter Pin
If you are using an external source for your REQ signal, connect it to the
appropriate REQ pin of the I/O connector.
If you are using external start and/or stop triggers, connect to the
appropriate pins—start trigger (ACK/STARTTRIG) and/or stop trigger
(STOPTRIG).
Most significant 32 bits of transfer count
Least significant 32 bits of transfer count
Most significant 32 bits of transfer count
Least significant 32 bits of transfer count
NI 653X I/O Connector 68-Pin
Assignments.
2-13
Chapter 2 Using Your NI 653X
Value Returned
Assignments, or
NI 653X User Manual