National Instruments NI USB-621x - Manual (Page 65)

Chapter 6 Connecting AI Signals on the USB-6215/6218 Devices
NI USB-621x User Manual 6-2 ni.com
Refer to Figure 6-1 for an illustration of a differential connection
configuration.
Figure 6-1. Connecting a Device to a USB-6215/6218 Using Differential Connections
3 A I3 AI 11
4 A I4 AI 12
5 A I5 AI 13
6 A I6 AI 14
7 A I7 AI 15
16* AI 16 AI 24
17* AI 17 AI 25
18* AI 18 AI 26
19* AI 19 AI 27
20* AI 20 AI 28
21* AI 21 AI 29
22* AI 22 AI 30
23* AI 23 AI 31
* USB-6218 devices only.
Table 6-1. I/O Connector Signals (Continued)
Channel Signal + Signal –
AI0+
AI0– (AI8) 1
MUX
AI1+
AI1– (AI9) 1
AI GND
V
cm
V
1
V
2
ADC PGIA
1 This signal name indicates the differential pair. Refer to
Table1 for a list of differential signal pairs.
USB-6215/6218