Wiring teds channels, Grounding and shielding considerations – National Instruments NI 9219 User Manual
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NI 9219 Operating Instructions
10
ni.com
Wiring TEDS Channels
The NI 9219 supports only Class II TEDS sensors. Connect the two
TEDS lines to TEDS Data (T+) and TEDS COM (T–) and ensure
that neither T+ nor T– is tied in common to any of the signal inputs
(terminals 3 through 6) on the NI 9219. Visit
ni.com/info
and
enter the info code
rdteds
for information about TEDS sensors.
Grounding and Shielding Considerations
You can connect ground-referenced or floating signal sources to
the NI 9219. If you make a floating connection between the signal
source and the NI 9219, make sure the voltages on the positive and
negative connections are within the channel-to-earth working
voltage range to ensure proper operation of the NI 9219. Refer to
the
section for more information about operating
voltages and overvoltage protection.
Note
For best signal quality, National Instruments
recommends using shielded cables and twisted pair
wiring whenever possible.
Figures 3 and 4 illustrate connecting grounded and floating signal
sources to the NI 9219 in Voltage mode.