2.4
Commands
2 – 7
2.4.5
Status commands
The Status commands query and configure registers associated with
status reporting of the SIM910.
Status Byte
*STB?
Reads the Status Byte register.
Execution of the
*STB?
query clears all flag bits set in the Status Byte
register (see the Register Model section 2.5 for more about the Status
Byte register).
*STB
also causes the
−
STATUS signal to be deasserted, as long as the
module is not in Status-Monitors-Overload mode (see
STOL
).
*STB?
Example:
128
Service Request Enable
*SRE(?)
{
i
}
Set (query) the Service Request Enable register
{
to
i
}
See section 2.5.
*SRE 128
Example:
Status Monitors Overload
STOL(?)
{
i
}
Set (query) the Status-Monitors-Overload mode
{
to
i
=
(
0, 1
)
}
.
STOL
1
causes the
−
STATUS signal (pin 2 on J401 Dsub-15 connec-
tor) to become a real-time monitor of the amplifier overload detect
circuit.
STOL
0
restores
−
STATUS to reflect the overall service re-
quest message from the Status Byte register. In applications where
prompt flagging of an amplifier overload is required,
STOL
1
mode
provides a single interface line for this signal.
The state of
STOL
is stored in non-volatile memory and restored
upon power-on reset. Neither
*RST
nor device-clear a
ff
ects the state
of
STOL
.
STOL 0
Example:
Overload
OVLD?
Reports the current overload condition. Query returns
0
for normal
operation, or
1
if the amplifier is presently in overload.
OVLD?
Example:
1
SIM910
JFET Preamp
