Low-level memory write to VXI register
A VISA-VXI or VISA-GPIB-VXI object.
The data written to the memory address.
The offset in the mapped memory space to which the data is written.
The number of bits to write to the memory address.
mempoke(obj,data,offset) writes the
uint8 value specified by
data to the
mapped memory address specified by
offset for the object
data using the number of bits specified by
uint32, which instructs
mempoke to write
data as 8-, 16-, or 32-bit values, respectively.
precision can also be
mempoke to write
Create the VISA-VXI object
vv associated with a VXI chassis
with index 0, and a Keysight™ E1432A digitizer with logical address 130.
vv = visa('keysight','VXI0::130::INSTR'); fopen(vv)
memmap to map 16 bytes in the A16 address space.
Perform a low-level write to the fourth instrument register, which has an offset of 6.
Unmap the memory and disconnect
vv from the instrument.
Refer to Using High-Level Memory Functions for a description of the first four registers of the E1432A digitizer.
Before you can write to the VXI register,
obj must be connected
to the instrument with the
fopen function. A connected
interface object has a
Status property value of
open. An error is returned if you attempt a write operation
obj is not connected to the instrument.
offset indicates the offset in the mapped memory space to which
the data is written. For example, if the mapped memory space begins at 200H, the
offset is 2, and the precision is
uint8, then the data is written
to memory location 202H. If the precision is
uint16, the data is
written to 202H and 203H.
To increase speed,
mempoke does not return error
messages from the instrument.