User`s manual

The Device Type
Register
The Device Type Register contains a model code which identifies the
device.
Address 1514131211109876543210
base + 02
16
Model Code
Model Code. The following model codes identify the HP E1326B and
E1411B multimeters:
FF38
16
- HP E1411B 5
1
⁄
2
Digit Multimeter
FF40
16
- HP E1326B 5
1
⁄
2
Digit Multimeter
The “Programming Examples” section on beginning on page 220 shows
how to read the Device Type Register.
The Status Register Register-based programs are regulated by the Status Register. This register
is continually monitored to determine when to send a command, when a
measurement is complete, when data is available, etc.
Address 15 - 8 76543210
base + 04
16
FF
16
DONE NOERR MM
Comp
Data
Ready
Extended Passed Q.Resp
Ready
Cmd/
Parm
Ready
DONE. A zero (0) in bit 7 indicates the multimeter is processing a
command and its parameters. Bit 7 is set to one (1) by the multimeter when
it is finished. The validity of this bit is determined by bit 0, and in turn, bit
7 determines the validity of bits 6, 5, 4, and 1. See “Status Bit Precedence”
on page 207 for more information.
NOERR. A zero (0) in bit 6 indicates a programming error has occurred.
Bit 6 is set to one (1) when the next command opcode is received. The error
code, however, is stored until it is read from the Query Response Register or
until it is overwritten by another error.
MULTIMETER COMPLETE. A one (1) in bit 5 indicates the
analog-to-digital conversion is in progress. Bit 5 stays set to "1" for
approximately 400 µs. If autozero is on, the bit is set for the specified
aperture time (except for the 267/320 ms aperture time in which the bit is
set for 400 µs). It is often necessary to turn autozero on to detect when the
bit is set.
Data Ready. A one (1) in bit 4 indicates that a reading is available in the
multimeter’s Data Buffer. The bit is cleared (0) when the data is read from
the buffer. The bit is also cleared when the data is no longer valid (that is,
following a command which changes the measurement function).
Extended. A zero (0) in bit 3 and a one (1) in bit 2 indicates the multimeter
is performing an extended self-test.
206 HP E1326B/E1411B Multimeter Register-Based Programming Appendix C