176 Chapter 4
Downloading and Using Files
Downloading User File Data
Bit and Binary Directories
User files can be downloaded to a bit or binary directory in either volatile or non-volatile memory.
Bit Directory Downloads
The bit directory (/user/bit/) accepts data in integer number of bits, up to the maximum available
memory.
The data length in bytes for files downloaded to bit memory is equal to the number of significant bits plus
seven, divided by eight, then rounded down to the nearest integer. Each file has a 16-byte header associated
with it.
There must be enough bytes to contain the specified number of bits. If the number of bits is not a multiple of
8, the least significant bits of the last byte are ignored.
For example, specifying 14 bits of a16-bit string using the command :MEMory:DATA:BIT
"file_name", 14, #12Qz results in the last 2 bits being ignored. See the following figure.
A bit directory provides more versatility, and is the preferred memory location for user file downloads.
SCPI Commands
Send the following command to download the user file data into the signal generator’s bit directory:
:MEMory:DATA:BIT "<file_name>", <bit count>, <datablock>
Example
:MEMory:DATA:BIT "file_name", 16, #12Qz
file_name provides the user file name as it will appear in the signal generator’s bit catalog
#1 1 decimal digits will be used to define the number of data bytes.
2 2 bytes of data will follow
Qz the ASCII representation of the 16 bits of data that are downloaded to the signal
generator.
010 0001 0111 1010 original user-defined data contains 2 bytes, 16 bits total
SCPI command sets bit count to 14; the last 2 bits are ignored
010000101111010
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