Stanford Research Systems SR844, User Manual

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4-30 Status Reporting
SR844 RF Lock-In Amplifier
Status Reporting Commands
The Status Registers are defined in the following section.
*CLS
The *CLS command clears all status registers. The status enable registers are not
cleared.
*STB?[i]
The
*STB?
command queries the value of the Serial Poll Status register. The
value is returned as a decimal number from 0 – 255. The
*STB?i
command
queries the value (0 or 1) of bit
i
(0–7). Reading this register has no effect on its
value. This command cannot be used to read status bit 1 (command execution in
progress). Use serial poll to determine command execution status.
*SRE(?)[i,]{j}
The
*SREj
command sets the Serial Poll Enable register to the decimal value
j
(0–255). The
*SREi,j
command set bit
i
(0–7) to
j
(0 or 1). The
*SRE?
command queries the value (0–255) of the Serial Poll Enable register. The
*SRE?i
command queries the value (0 or 1) of bit
i
.
*ESR?[i]
The
*ESR?
command queries the value of the Standard Event Status register.
The value is returned as a decimal number from 0 – 255. The
*ESR?i
command
queries the value (0 or 1) of bit i (0–7). Reading the entire register will clear it,
while reading bit
i
will only clear bit
i
.
*ESE(?)[i,]{j}
The
*ESEj
command sets the Standard Event Enable register to the decimal
value
j
(0–255). The
*ESEi,j
command sets bit
i
(0–7) to
j
(0 or 1). The
*ESE?
command queries the value (0–255) of the Standard Event Enable
register. The
*ESE?i
command queries the value (0 or 1) of bit
i
.
*PSC(?){i}
The
*PSC
command sets the value of the Power-On Status Clear bit. If
i=1
the
power-on status clear bit is set and all status registers and enable registers are
cleared on power-on. If
i=0,
the bit is cleared and the status enable registers
maintain their values at power-off. This allows a service request to be generated
at power-on.
ERRS?[i]
The
ERRS?
command queries the value of the Error Status register. The value is
returned as a decimal number from 0 – 255. The ERRS?i command queries the
value (0 or 1) of bit
i
(0–7). Reading the entire register will clear it, while
reading bit
i
will only clear bit
i
.
ERRE(?)[i,]{j}
The
ERREj
command sets the Error Status Enable register to the decimal value
j
(0–255). The
ERREi,j
command sets bit
i
(0–7) to
j
(0 or 1). The
ERRE?
command queries the value (0–255) of the Error Status Enable register. The
ERRE?i
command queries the value (0 or 1) of bit
i
.
LIAS?[i]
The
LIAS?
command queries the value of the Lock-In (LIA) Status register. The
value is returned as a decimal number (0 – 65535). The
LIAS?i
command
queries the value (0 or 1) of bit
i
(0–15). Reading the entire register will clear it,
while reading bit
i
will only clear bit
i
.
LIAE(?)[i,]{j}
The
LIAEj
command sets the Lock-In (LIA) Status Enable register to the
decimal value
j
(0–65535). The
LIAEi,j
command sets bit
i
(0–15) to
j
(0 or
1). The
LIAE?
command queries the value (0–65535) of the LIA Status Enable
register. The
LIAE?i
command queries the value (0 or 1) of bit
i
.