
Chapter 14 SCXI Hardware
DAQ Hardware Overview Guide 14-16 www.ni.com
chassis, you do not need to cable the SCXI-1124 to anything; NI-DAQ will
communicate with the module using the SCXIbus backplane. In this case,
the MIO/DIO jumpers on the module are irrelevant. If you plan to use
analog input SCXI modules in addition to the SCXI-1124, and you are not
using an SCXI-1200 DAQ module, you should cable one of the analog
input modules to the DAQ device.
If you are using remote SCXI, you can use the SCXI-1124 with or without
the SCXI-1200 DAQ module, because NI-DAQ will communicate with the
SCXI-1124 via the backplane and through the serial port cable.
SCXI Digital Modules
The following devices are SCXI digital modules.
SCXI-1160 and SCXI-1161
The SCXI-1160 is a 16-channel power relay module with 16 independent
one-form C relays. The relays are latched—the module powers up with its
relays in the position in which they were left at power down. You can set
or reset each relay without affecting the other relays, or all relays can
change state at the same time.
The SCXI-1161 is an 8-channel power relay module with eight
independent one-form C relays. The relays are nonlatched, and the module
powers up with its relays in the Normally Closed (NC) position or when the
hardware reset is set on the module. You can set or reset each relay without
affecting the other relays, or all the relays can change state at the same time.
The SCXI-1160 and SCXI-1161 modules only support multiplexed (also
known as serial) mode. If you cable an MIO or AI device, or Lab or
1200 device, to one of these modules, you must set jumpers on the module
to the MIO position. If you cable a DIO device to one of these modules, you
must set jumpers on the module to the DIO position. If you have not cabled
any device to the module, NI-DAQ will be using the SCXIbus backplane to
communicate with the module, therefore the MIO/DIO jumpers are
irrelevant.
If you are using remote SCXI, you can use the SCXI-1160 or SCXI-1161
with or without the SCXI-1200 DAQ module, because NI-DAQ will
communicate with the SCXI-1160 or SCXI-1161 via the backplane and
through the serial port cable.
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