
3-18 Programming Guide
Remote Data Transfer ESG Family Signal Generators
User File Data Downloads
The PN15 behaves just like a user file of equal length (32,767 bits).
Downloading User File Data
This section includes information that explains how to download user file data. It includes
data requirements and limitations, preliminary setup, SCPI commands and sample
command lines for both downloads to the bit memory catalog and the binary memory
catalog.
Data Requirements and Limitations Summary
1. Data must be binary.
2. Bit length must be multiple of the data-field length of the active TDMA format.
3. User file size is limited by the available memory in the memory catalog.
4. When designing user files, you must consider the signal generator’s PRAM size
(1 Mbyte or 8 Mbyte), framing overhead, and the available memory in the memory
catalog.
5. For downloads to the binary memory catalog, bit length must be multiple of 8.
Preliminary Setup
No preliminary setup is required for user file downloads.
Bit Memory Catalog Downloads
The bit memory catalog accepts data in any integer number of bits, up to the maximum
available memory in the bit memory catalog (approximately 1 Mbit). The data length in
bytes for files downloaded to the bit memory catalog is equal to the number of significant
bits plus seven, divided by eight, then rounded down to the nearest integer.
You must have enough bytes to contain the bits you specify. If the number of bits is not a
multiple of 8, the least significant bits of the last byte will be ignored.
For example, specifying 14 bits of a16-bit string using the command :MEMory:DATA:BIT
"userfile1", 14, #12Qz results in the last 2 bits being ignored. See the following figure.
The bit memory catalog provides more versatility and is the preferred memory catalog for
user file downloads.
SCPI Commands :MEMory:DATA:BIT "<file name>", <bit count>, <datablock>
Execute this command to download the user file data into the signal generator’s bit
memory catalog. The variable <file name> denotes the name that will be associated with
the downloaded user file within 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
010 0001 0111 1010
010 0001 0111 10 only the most significant 14 bits are downloaded and stored as a bit file
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