Operating instructions

TRACe Subsystem R&S ESCI

1166.6004.12 6.228 E-1

ASCII Format (FORMat ASCII):

In this case the command returns a comma separated list of the measured voltage values in floating

point format (Comma Separated Values = CSV). The number of values returned is 2 * number of

samples, the first half being the I-values, the second half the Q-values.

Binary Format (FORMat REAL,32):

In this case the command returns binary data (Definite Length Block Data according to IEEE 488.2),

with the lists of I- and Q-data being arranged one after the other in 32 Bit IEEE 754 floating point

data. The scheme of the response string is as follows:

#41024<I-value1><I-value2>...<I-value128><Q-value1><Q-value2>...<Q-value128>

with

#4 digits of the subsequent number of data bytes (4 in the example)

1024 number of subsequent data bytes (# of DataBytes, 1024 in the example)

<I-value x> 4-Byte-Floating Point I-value (max. 128k resp. 512k with option R&S FSP-B70

<Q-value y> 4-Byte-Floating Point Q-value (max. 128k resp. 512k with option R&S FSP-B70

The number of I- and Q-data can be calculated as follows:

DataBytesof

DataQofDataIof =−=−

The offset of Q-data in the output buffer can be calculated as follows:

scatorDigitLengthIndi

DataBytesof

OffsetDataQ +=−−

)(#

with LengthIndicatorDigits being the number of digits of the length indicator including the '#'. In the

example above (#41024...) this results in a value of 6 for LengthIndicatorDigits and the offset for the

Q-data will result in 512 + 6 = 518.

Characteristics: *RST value: --

Note:

Using the command with the *RST values for command

TRAC:IQ:SET the following minimum buffer sizes for

the response data are recommended:

ASCII format:10 kBytes

Binary format:2 kBytes

SCPI: device specific

Mode:A-T