Measurement Computing PC104-DAS16JR/12 - Manual (Page 12)

2.3 SINGLE-ENDED
A single-ended input is two wires connected to the board, a channel high (CH# HIGH)
and a Low Level Ground (LLGND). The LLGND signal must be the same ground the
PC is on. The CH# HIGH is the voltage signal source (Figure 2-4).
Figure 2-4. Single-Ended Input
2.4 FLOATING DIFFERENTIAL
A floating differential input is two wires from the signal source and a 10K ground
reference resistor installed at the input. The two signals from the signal source are
Signal High (CH# HIGH) and Signal Low (CH# LOW).
The reference resistor is connected between CH# LOW and LLGND pins.
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