Register Descriptions
There are three WRITE and five READ registers on the multimeter. This
section contains a description and a bit map of each register.
The WRITE
Registers
The following WRITE registers are located on the multimeter.
–
Control Register (base + 04
16
)
–
Command Register (base + 08
16
)
–
Parameter Register (base + 0A
16
)
The Control
Register
The Control Register is used to reset the multimeter, to disable the
multimeter from driving the SYSFAIL line, and to initiate multimeter
measurements.
Address
15 - 8
7
6
5
4
3
2
1
0
base + 04
16
Not Used
X
X
X
X
X
MM
Samp
SYS
FAIL
Reset
Resetting the Multimeter. Writing a one (1) to bit 0 resets the multimeter.
Writing a zero (0) turns the reset function off. While bit 0 is 1, the
multimeter continually resets.
De-asserting SYSFAIL. Writing a one (1) to bit 1 prevents the multimeter
from driving the SYSFAIL line. Writing a zero (0) allows the multimeter to
drive SYSFAIL.
The multimeter drives the SYSFAIL line during a self-test, and the line
remains asserted if the self-test fails. If the multimeter fails its power on
self-test, the Resource Manager de-asserts SYSFAIL and resets the
multimeter to take the device off-line. If a self-test fails during
register-based programming, you must write a "1" to bit 1 to de-assert
SYSFAIL and then reset the multimeter to take it off-line.
The “Programming Examples” section beginning on page 220 shows how to
reset the multimeter.
Control Register Sampling. When the multimeter is in the wait-for-trigger
state and the sample source is set to "Control Register", the multimeter will
make a measurement when a one (1) is written to Control register bit 2.
Note
This sampling method is available on the HP E1326B/E1411B
multimeters only. Refer to the “Control Register Sampling” section on
page 219 for information on setting up the multimeter to take samples using
this method.
Appendix C
HP E1326B/E1411B Multimeter Register-Based Programming 203
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