280 34980A User’s Guide
10 64-Bit Digital I/O Module with Memory and Counter
Set the number of samples to collect. The SENSe:DIGital:MEMory:SAMPle:COUNt
command sets the number of samples to capture. If you set the number of
counts to infinite (0 = default), the bank will capture data until a STOP is
received. Older samples are overwritten if memory gets full. Allowed
sample counts depend upon the channel width as follows:
• BYTE (8- bit) 1 to 65535
• WORD (16- bit) 1 to 65535
• LWORd (32- bit) 1 to 32767
Start the capture. The SENSe:DIGital:MEMory:STARt command sets the
channel to begin the data capture. The capture begins when the handshake
occurs.
Check the status of the transfer. You can use the
SENSe:DIGital:MEMory:DATA:POINts?
query to return the number of
samples currently in memory.
Retrieve the captured data. Set the desired memory retrieval format using
the
SENSe:DIGital:DATA:FORMat command. You can set the memory to be
read as either LIST or BLOCk. The LIST parameter (default) returns the
data as comma separated ASCII values. BLOCk returns the data in
IEEE- 488 block format.
Before you can read the data in memory, you must stop the memory
operations using the
SENSe:DIGital:MEMory:ENABle OFF command.
Read all the captured data using the
SENSe:DIGital:MEMory:DATA:ALL?
query. This performs a non- destructive read of all data in the bank’s
memory.
To read specific captures, use the
SENSe:DIGital:MEMory:DATA? form of
the command. This command takes index and count parameters to specify
which data to retrieve. The oldest data in memory has an index of ‘0’.
The count specifies the number of samples to read. count + index must
be less than the number of captured points.
Both these data reads are non- destructive to the bank memory.
To clear the memory for new data, send the
SENSe:DIGital:MEMory:CLEar
command.
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