ROUTe:CHANnel:ADVance:SOURce {BUS | IMMediate | EXTernal}
ROUTe:CHANnel:ADVance:SOURce?
Selects the source of signal that advances to the next channel in the scan list when scanning with an external DMM
(internal DMM disabled). When the channel advance signal is received, the instrument opens the currently selected
channel and closes the next channel in the scan list. The instrument will accept a software command (BUS), con-
tinuous scan trigger (IMMediate), or external TTL-compatible (EXTernal) trigger pulse.
This command is valid only when the internal DMMis disabled (see INSTrument:DMM command).
DAQM907A channels are not allowed in the scan list when the internal DMMis disabled.
Parameter Typical return
{BUS | IMMediate | EXTernal}
Default: EXTernal
BUS, IMM, or EXT
Configures the instrument for scanning using an external channel advance source. In this configuration, the instrument advances to the next
channel in the scan list each time a low-true TTL-compatible pulse is received.
INST:DMM OFF !Disable internal DMM
ROUT:SCAN (@101:120) !Configure scan list
TRIG:SOUR IMM !Set trigger source
TRIG:COUN 5 !Set trigger count
ROUT:CHAN:ADV:SOUR EXT !Set channel advance source
Typical response: EXT
– For the BUS (software) source, the instrument is triggered by the *TRG command received over the remote inter-
face. The *TRG command will not be accepted unless the instrument is in the "wait-for-trigger" state (see INITi-
ate command). If instrument receives an external trigger before the next "waiting for trigger" state, it will buffer
one *TRG command and then ignore any additional triggers received (no error is generated).
– For the IMMediate (continuous) source, the channel advance signal is always present.
– For the EXTernal source, the instrument will accept a hardware trigger applied to the rear-panel Ext Trig/Alarms
connector. The instrument advances to the next channel in the scan list each time a low-true TTL-compatible
pulse is received.
– The channel advance signal is ignored unless you have initiated the scan (INITiate command) and have received a
scan trigger (TRIGger:SOURce command). Although this command shares some of the same signals as the
TRIGger:SOURce command, they cannot be set to the same source (except IMMediate). If you attempt to select
the same source, an error is generated and the TRIGger:SOURce is reset to IMMediate.
– When the first trigger is received, the instrument closes the first channel in the scan list without waiting for the
specified channel advance source. If the channel advance source is EXTernal and the instrument receives an
event before it is ready, it will buffer one event and then ignore any additional events received (no error is gen-
erated).
– After the final channel in the scan list is closed, one more channel advance event must be received to complete
the scan.
204
Keysight DAQ970A/DAQ973A Programming Guide
2 SCPI Programming
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