HP E1429A manual Example 2 Reading back PACKed data HP Basic program, Assign @X to 70905FORMAT OFF

DIAGnostic:FETCh?

∙Refer to the "Memory Management" section in Chapter 3 for information on where segmented readings are stored in memory.

∙Both channels can be fetched interleaved by specifying DIAG:FETC3?. When both channels are fetched, the channel 1 data is the first data point, and the count specified is the number of readings to be taken on each channel, and is thus limited to 1000 per channel.

∙The start_addr must be divisible by 4. If it is not, then the next lowest memory location divisible by 4 will be the actual start_addr used, i.e. a start_addr of 511 would be rounded down to be 508.

∙Data is sent back in binary block format with a header string preceeding the data. The header is made of the ascii string: #,number_of_digits,number_of_bytes -- where # indicates binary block data, number_of_digits is how many ascii digits make up the following byte count, and number_of_bytes is the byte count. After the header, the stream of data bytes occurs. Example 2 below shows how to accomodate the header string using the HP Rocky Mountain Basic programming language.

∙Related Commands: ABORt, FORMat, INITiate:IMMediate, ARM:STARt:COUNt, TRIGger:STARt:COUNt, SENSe:SWEep:POINts:DELay

∙*RST Condition: none

Example 1 Examining readings in a portion of memory

DIAG:FETC? 5200,300	Get 300 readings from channel 1, beginning
	at address 5200.

Example 2 Reading back PACKed data (HP BASIC program)

DIM Ndig$[1],Count$[9]	Dimension parameters for header
ASSIGN @X TO 70905;FORMAT OFF

Turn format off for array data

OUTPUT 70905;"DIAG:FETC1? 5200,300" Query for channel 1 measurement data

ENTER @X USING "#,X,K,K";Ndig$;Count$[1;VAL(Ndig$)]

Strip the header preceeding the data

ALLOCATE INTEGER Meas_data(1:VAL(Count$)/2)

	Allocate an array to hold the data
ENTER @X;Meas_data(*)	Read in the measurement data
ENTER 70905 USING "B";Junk	Need to strip off left over line feed

DIAGnostic Subsystem Command Reference 219