The Query Response Register - HP E1326B User Manual

Passed. A zero (0) in bit 2 indicates the multimeter is executing a reset, or
is executing or failed its self-test. A one (1) indicates the reset is finished or
the self-test passed.
Q.Resp Ready. A one (1) in bit 1 indicates data returned by a query is in
the Query Response Register. The bit is cleared (0) when the response is
read from the register.
Cmd/Parm Ready. A one (1) in bit 0 indicates a command or parameter
can be written to the Command or Parameter Registers. The bit is cleared
(0) when the command or parameter is received. Bit 0 also determines the
validity of bit 7. See "Status Bit Precedence" for more information.
Status Bit Precedence
In addition to the conditions the bits monitor, certain status bits indicate the
validity of other bits in the Status Register. This solves race situations
between selected bits.
When bit 0 is zero (0), bit 7 is invalid. This allows the multimeter to clear
bit 7 (set it to zero (0)) to indicate that a command or parameter is being
processed.
When Bit 7 is zero (0), bits 6, 5, 4, and 1 are invalid. This allows the
multimeter time to set those bits to the correct states based on the conditions
they represent.
The Query
When the multimeter is queried as to its configuration (that is, function,
range, aperture time) or when an error code is requested, the reply is sent to
Response Register

the Query Response Register.

Address 15 - 8 7 6 5 4 3 2 1 0
base + 08 Query Response
FF
16 16
Query Response. The response returned to the register is an error code or a
parameter opcode. For example, if the measurement function is AC
voltage, 01 is returned when the function is queried.
16
When multimeter parameters such as the trigger count, trigger delay, sample
count, and sample rate are queried, a 16-bit or 24-bit unsigned number is
returned. Thus, the Query Response Register must be read two or three
consecutive times in order to retrieve the upper byte and lower byte or to
retrieve the high byte, middle byte, and low byte.
Appendix C HP E1326B/E1411B Multimeter Register-Based Programming 207
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