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SCPI Commands for the SurePatht Modules
3–274
VX4101A MultiPaq Instrument User Manual
[ROUTe:]OPEN:ALL <module_name>
If a module name is not specified in this command, open all relays on all
modules controlled by the SurePathtMaster. If a module name is specified,
open all relays on the specified module only. In either case, do not change the
state of the configuration relays on the modules.
[ROUTe:]OPEN:DWELl <module_name>, <nrf>
This command sets the time to wait after opening a relay before proceeding.
[ROUTe:]PFAil <action_at_powerfail>
This command specifies the state that all latching relays on all modules
controlled by the SurePathtMaster are to be placed in when power is removed
from the VXI chassis containing the modules. <action_at_powerfail> must be
OPEN or SAME. If OPEN is specified, all latching relays are opened at power
fail. If SAME is specified, all latching relays are left in their current state at
powerfail.
NOTE. VXI chassis +5 V power is maintained for 4 ms after ACFAIL is asserted,
in compliance with VXI Specifications. This allows for orderly system shutdown
and implementation of the PFAil OPEN option.
[ROUTe:]SCAN <channel_list>
This command defines a list of scan relay closures to sequence. When the
ROUTe:SCAN <channel_list> command is received, all relays in this list are
opened. In addition to defining a scan list, a trigger source must be specified
using the TRIGger[:SEQuence]:SOURce command. Trigger events are not
recognized until triggers are armed by a INITiate[:IMMediate] or INITiate:CON-
Tinuous command.
When the first trigger event is detected, the first relay in the scan list is closed.
When the second trigger event is detected, the first relay is opened and the
second relay is closed. When the n
th
trigger event is detected, the (n–1)
th
relay is
opened and the n
th
relay is closed. The act of opening the (n–1)
th
relay and
closing the nth relay is called sequencing the scan list. At any given time after
the first trigger event is detected, only one relay in the scan list is closed.
The TRIGger[:SEQuence]:COUNt command may be used to specify the number
of times to sequence through the entire scan list. The TRIGger [:SE-
Quence]:DELay, [ROUTe:]CLOSe:DWELl, and [ROUTe:]OPEN:DWELl
commands may optionally be used to specify the time to wait after a trigger
event is detected, a relay is closed or a relay is opened. A TRIGger[:SEQuence]
:IMMediate command causes the scan list to be sequenced without the delay
specified by a previously issued TRIGger[:SEQuence]:DELay command.