User`s guide

Signal Connections
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21
SSI_DAWR
SSI master: send the DAWR out.
SSI slave: accept the SSI_DAWR to replace the internal
DAWR signal.
SSI_DA_TRIG
SSI master: send the DA_TRIG out.
SSI slave: accept the SSI_DA_TRIG as the digital trigger
signal.
Table 8: Legend of 20-pin ribbon male connectors
3.2 Analog Input Signal Connection
The DAQ-2213/2214 provides up to 16 single-ended or 8 differential ana-
log input channels. Users can fill the Channel Gain Queue to get desired
combination of the input signal types. The analog signal can be converted
to digital value by the A/D converter. To avoid ground loops and obtain a
more accurate measurement from the A/D conversion, it is important to
understand the signal source type and how to choose the analog input
modes: RSE, NRSE, and DIFF mode.
3.2.1 Types of signal sources
Floating Signal Sources
A floating signal source means it is not connected in any way to the
buildings ground system. A device with an isolated output is a floating
signal source, such as optical isolator outputs, transformer outputs, and
thermocouples.
Ground-Referenced Signal Sources
A ground-referenced signal means it is connected in some way to the
building’s system. That is, the signal source is already connected to a