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National Instruments Corporation
11
NI USB-9211/9211A User Guide and Specifications
Wiring the NI USB-9211/9211A Device
Caution
A high voltage screw terminal backshell must be installed when using hazardous
voltages (>42.4 V
pk
, 60 VDC).
Note
The NI 9932 10-terminal, detachable, high voltage, screw-terminal backshell
accessory works with the NI USB-9211/9211A and is available from
ni.com
. For more
information about installing the backshell, refer to the
Assembling the High Voltage Screw
Terminal Backshell
section.
The screw terminal provides connections for four thermocouple input
channels. Each channel has a terminal to which you can connect the
positive lead of the thermocouple, TC+, and a terminal to which
you can connect the negative lead of the thermocouple, TC–. The
NI USB-9211/9211A also has a common terminal, COM, that is internally
connected to the isolated ground reference of the module.
If you are unsure which of the thermocouple leads is positive and which is
negative, check the thermocouple documentation or the thermocouple wire
spool. If you are using shielded wiring, connect one end of the shield to the
COM terminal.
Table 2.
LED State/Device Status
LED State
Device Status
Not lit
Device not connected or in suspend.
On, not blinking
Device connected, but no module installed.
Single-blink
Operating normally.
Double-blink
Operating normally.
Quadruple-blink
Device error. Refer to
ni.com/support
.
