Agilent Technologies E8663B, N5183A, N5181A/82A As Seen in the Signal Generator’s Bit File Editor

Creating and Downloading User-Data Files

User File Data (Bit/Binary) Downloads (E4438C and E8267D)

SCPI Command :MEM:DATA:BIT <"file_name">,<bit_interest>,<datablock> :MEM:DATA:BIT "3byte",23, # 1 3 Z&x

ASCII representation of the data (3 bytes)

Start block data

number of bytes

number of decimal digits

Downloaded Data:

Bits of interest

0 1 0 1 1 0 1 0 0 0 1 0 0 1 1 0 0 1 1 1 1 0 0

0 Ignored bit (LSB)

MSB	Byte 1	Byte 2	Byte 3
Hex Value:	5A	26	78
ASCII Representation:	Z	&	x

The following figure shows the same downloaded data from the above example as viewed in the signal generator’s bit file editor (see the User’s Guide for more information) and with using an external hex editor program.

SCPI command to download the data :MEM:DATA:BIT "3byte",23,#13Z&x

As Seen in the Signal Generator’s Bit File Editor

Bit data

Designated number of bits

Hex values

As Seen in a Hex Editor

Designated number of bits (hex value = 23 decimal)

10 byte file header	3 bytes of data
(added by signal generator)

In the bit editor, notice that the ignored bit of the bit- data is not displayed, however the hex value still shows all three bytes. This is because bits 1 through 7 are part of the first byte, which is shown as ASCII character x in the SCPI command line. The view from the hex editor program confirms that the downloaded three bytes of data remains unchanged. To view a downloaded bit file with an external hex editor program, FTP the file to your PC/UNIX workstation. For information on how to FTP a file, see “FTP Procedures” on page 303.

Even though the signal generator views the downloaded data on a bit basis, it groups the data into bytes, and when the designated number of bits is not a multiple of 8 bits, the last byte into one or

Agilent N518xA, E8663B, E44x8C, and E82x7D Signal Generators Programming Guide 289