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OMB-DAQ-2416-4AO User's Guide Installing the OMB-DAQ-2416-4AO
11
Screw terminal pin out – differential
Figure 3. 16-channel differential mode pin out
Differential connection guidelines
When connecting differential voltage inputs to a "floating" voltage source, make sure there is a DC return
path from each voltage input to ground. You make this path by connecting a resistor from each input to a
GND pin (pins 18, 36, 39, 42, 44, 46, 66, 81, 84). A value of approximately 100 kΩ can be used for most
applications.
Leave any unused input channels either floating or tied to GND (pins 18, 36, 39, 42, 44, 46, 66, 81, 84).
Source impedances should be kept as small as possible to avoid settling time and accuracy errors.
When configuring thermocouple sensors, keep any stray capacitance as small as possible relative to GND
(pins 18, 36, 39, 42, 44, 46, 66, 81, 84) to avoid settling time and accuracy errors. For thermocouple
channels, do not provide a return path to ground. This is done internally.
49 NC No connection
50 CH15L Channel 15 LO
51 CH15H Channel 15 HI
52 NC No connection
53 NC No connection
54 CH14L Channel 14 LO
55 CH14H Channel 14 HI
56 NC No connection
57 NC No connection
58 CH13L Channel 13 LO
69 CH13H Channel 13 HI
60 NC No connection
61 NC No connection
62 CH12L Channel 12 LO
63 CH12H Channel 12 HI
64 NC No connection
No connection NC 1
Channel 0 HI CH0H 2
Channel 0 LO CH0L 3
No connection NC 4
No connection NC 5
Channel 1 HI CH1H 6
Channel 1 LO CH1L 7
No connection NC 8
No connection NC 9
Channel 2 HI CH2H 10
Channel 2 LO CH2L 11
No connection NC 12
No connection NC 13
Channel 3 HI CH3H 14
Channel 3 LO CH3L 15
No connection NC 16
No connection NC 17
Analog ground GND 18
Channel 4 HI CH4H 19
Channel 4 LO CH4L 20
No connection NC 21
No connection NC 22
Channel 5 HI CH5H 23
Channel 5 LO CH5L 24
No connection NC 25
No connection NC 26
Channel 6 HI CH6H 27
Channel 6 LO CH6L 28
No connection NC 29
No connection NC 30
Channel 7 HI CH7H 31
Channel 7 LO CH7L 32
No connection NC 33
No connection NC 34
+5 V output +5V 35
Analog ground GND 36
Analog out 0 VDAC0 37
Analog out 1 VDAC1 38
Analog ground GND 39
Analog out 2 VDAC2 40
Analog out 3 VDAC3 41
Analog ground GND 42
Counter input 0 CTR0 43
Analog ground GND 44
Counter input 1 CTR1 45
Analog ground GND 46
No connection NC 47
No connection NC 48
65 NC No connection
66 GND Analog ground
67 CH11L Channel 11 LO
68 CH11H Channel 11 HI
69 NC No connection
70 NC No connection
71 CH10L Channel 10 LO
72 CH10H Channel 10 HI
73 NC No connection
74 NC No connection
75 CH9L Channel 9 LO
76 CH9H Channel 9 HI
77 NC No connection
78 NC No connection
79 CH8L Channel 8 LO
80 CH8H Channel 8 HI
81 GND Analog ground
82 NC No connection
83 NC No connection
84 GND Analog ground
85 DIO7 Digital input/output
86 DIO6 Digital input/output
87 DIO5 Digital input/output
88 DIO4 Digital input/output
89 DIO3 Digital input/output
90 DIO2 Digital input/output
91 DIO1 Digital input/output
92 DIO0 Digital input/output
93 DGND Digital I/O ground
94 DGND Digital I/O ground
95 NC No connection
96 NC No connection