American Magnetics 430, Инструкции по установке, эксплуатации и обслуживанию

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140 R
EV
9
A
MERICAN
M
AGNETICS
, I
NC
. R
EMOTE
I
NTERFACE
R
EFERENCE
: P
ROGRAMMING
O
VERVIEW
ting is persistent if the Model 430 Programmer is configured for
*PSC 0
(no
status clear on power-on).
R
EADING THE
S
TATUS
B
YTE USING
*STB?
The
*STB?
returns the contents of the Status Byte register, but it
is processed in the command queue like any other command.
The
*STB?
command does not clear bit 6 of the Status Byte
register.
U
SING THE
M
ESSAGE
A
VAILABLE
B
IT
(
S
)
The “Message Available” bits (bits 3 or 4) of the Status Byte
register can be used to determine when data is available to read
into your host computer. The Model 430 Programmer clears the
“Message Available” bits only after all data has been read from
the output buffer(s).
The “Message Available” bits of the Status Byte register are
useful for determining if
queries
have executed; however, they
are not useful alone for determining if
commands
have
completed execution, since commands do not provide return
data.
S
TANDARD
E
VENT
R
EGISTER
The Standard Event register group reports a power-on condition, various
error conditions, and indicates when an operation has completed. Any or
all of the Standard Events can be reported to the Status Byte register by
enabling the corresponding bit(s) in the Standard Event enable register
(see the figure on page 138). To set the Standard Event enable register,
write a binary-weighted decimal value using the
*ESE <
value
>
command.
The bit definitions for the Standard Event register are provided in the
table on the following page. To query the Model 430 Programmer for the
details of a reported error in the Standard Event register, use the
SYSTem:ERRor?
query. See page 178 for a complete discussion of the
error buffer and messages.
The Standard Event
register
is cleared when:
• The
*CLS
(clear status) command is executed.
• The Standard Event register is queried using the
*ESR?
command.
• The power is turned off and then back on.
The Standard Event
enable register
is cleared when:
• The
*ESE 0
command is executed.
• The power is turned off and then back on, and the Model 430 Programmer
was configured for
*PSC 1
(power-on status clear). The enable register set-