Keysight P9241, Руководство программиста SCPI

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Status Reporting
35
Keysight P9241/42/43A Oscilloscopes SCPI Programmer's Guide 1169
ARM_MASK = 1 << ARM_BIT
# Define armed criteria.
ARMED = 1 << ARM_BIT # 1 leftshift 7 = 128
# Test for armed.
STATUS_BYTE = int(KsInfiniiVisionX.read_stb())
ARMED_STATUS = STATUS_BYTE & ARM_MASK
# Note that you could also do:
# ARMED_STATUS = int(KsInfiniiVisionX.query("*STB?))
# BUT *STB? does not work with the blocking :DIGitize.
# Wait indefinitely until armed.
while ARMED_STATUS != ARMED:
# Check the status again after small delay.
time.sleep(0.1) # 100 ms delay to prevent excessive queries.
STATUS_BYTE = int(KsInfiniiVisionX.read_stb())
ARMED_STATUS = STATUS_BYTE & ARM_MASK
print "Oscilloscope is armed (method 2, using Read STB function)!"
print "It took " + str(time.clock() - now) +\
" seconds to arm.\n"
# ====================================================================
# Method 3: Query the Operation Status Event Register with :OPER?
# --------------------------------------------------------------------
# This method reads the Operation Status Event Register's Wait Trig
# bit (bit 5) using the :OPER? query.
#
# The Operation Status Event Register bits are cleared (0) when the
# register is read.
#
# Also, the Wait Trig bit does NOT go low (0) when the oscilloscope
# becomes unarmed by starting or stopping another acquisition (before
# the first one finishes) or by changing the time scale.
#
# The Wait Trig bit is cleared by a *CLS command, by reading the
# Operation Status Event Register with the :OPER? query, or by reading
# the Armed Event Register regsiter with the :AER? query.
# ====================================================================
def method_3():
# Stop the oscilloscope.
KsInfiniiVisionX.query(":STOP;*OPC?")
# Method 3: Initiate capture using :SINGle
# ----------------------------------------------------------------
print "Acquiring signal (Method 3, using :SINGle)...\n"
now = time.clock()
# Clear all status registers before checking for new events.
KsInfiniiVisionX.write("*CLS")
# Because the :OPER? query will not work with :DIGitize (which is
# blocking), use the :SINGle command to start the acquisition.
KsInfiniiVisionX.write(":SINGle")