Agilent Technologies 75000 SERIES B Non-Volatile User Memory, Allocating a User Memory Segment

Example: Storing and Retrieving Data From Mainframe Memory. This example shows how to use mainframe memory to store 15 readings made using an Agilent E1326A Multimeter. After the readings are stored, they are retrieved by the computer and displayed.

10 REAL OHM_RGS(1:15)	Create computer array for 15
	readings
20 OUTPUT 70903;"CONF:FRES (@105:109)"
	Configure multimeter for 4-wire
	resistance, scan channels 105 -
	109
30 OUTPUT 70903;"RES:OCOM ON"	Enable offset compensation
40 OUTPUT 70903;"TRIG:COUN 3"	Cycle through scan list 3 times
50 OUTPUT 70903;"INIT"	Trigger multimeter, store the
	readings in mainframe memory
60 OUTPUT 70903;"FETCH?"	Get readings from mainframe
	memory
70 ENTER 70903;OHM_RGS(*)	Enter readings into computer
80 PRINT OHM_RGS (*)	Display readings on computer
90 END

Non-Volatile User Memory

The System Instrument provides a way to allocate a segment of its non-volatile memory for storage and retrieval of user data. The structure and content of the data you store in this memory segment is up to you. The commands provided for data access merely store or retrieve a specified number of bytes. Commands for allocating and accessing the memory segment are implemented by the System Instrument (logical address, and GPIB secondary address 0).

Allocating a User Memory Segment

The SCPI command DIAGnostic:NRAM:CREate < size> is used to allocate a segment of User non-volatile RAM. The ammount of memory allocated is controlled by the size parameter. The DIAG:NRAM:CRE command informs the system of your request for a User RAM segment. The segment in not allocated until the system is reset (DIAG:BOOT command, or RESET from the front panel). Once the NRAM segment is allocated, you can consider it part of your System Instrument’s configuration. It will remain through power interruptions and system resets. Only the DIAG:BOOT:COLD , or DIAG:NRAM:CRE 0 commands can de-allocate the NRAM segment.

Note:	Allocating an NRAM segment will de-allocate a previously allocated RDISk
IBASIC Users	segment. To include both types; allocate them both before a reset, or allocate
	the NRAM segment, reset the system, then allocate the RDISk segment and
	again reset the system.

Locating the NRAM	Since the system decides where in memory to locate the NRAM segment, you
segment	must execute the DIAG:NRAM:ADDRess? query to determine its starting

Using the Mainframe 4-7