Measurement Computing USB-3101 - Manual (Page 15)

USB-3101 User's Guide Functional Details
15
2
9
V
O
U
T
1
3
0
N
C
3
1
V
O
U
T
3
3
2
N
C
3
3
A
G
N
D
3
4
N
C
3
5
N
C
3
6
N
C
3
7
N
C
3
8
A
G
N
D
3
9
N
C
4
0
N
C
4
1
N
C
4
2
N
C
4
3
A
G
N
D
4
4
N
C
4
5
N
C
4
6
N
C
4
7
N
C
5
0
D
G
N
D
5
1
N
C
5
2
C
T
R
5
3
D
G
N
D
5
4
D
IO
C
T
L
5
5
D
G
N
D
5
6
+
5
V
4
8
A
G
N
D
4
9
S
Y
N
C
L
D
V
O
U
T
0
1
N
C
2
V
O
U
T
2
3
N
C
4
A
G
N
D
5
N
C
6
N
C
7
N
C
8
N
C
9
A
G
N
D
1
0
N
C
1
1
N
C
1
2
N
C
1
3
N
C
1
4
A
G
N
D
1
5
N
C
1
6
N
C
1
7
N
C
1
8
N
C
1
9
A
G
N
D
2
0
D
IO
0
2
1
D
IO
1
2
2
D
IO
2
2
3
D
IO
3
2
4
D
IO
4
2
5
D
IO
5
2
6
D
IO
6
2
7
D
IO
7
2
8
Figure 5. USB-3101 signal pin out
Analog voltage output terminals (VOUT0 to VOUT3)
The screw terminal pins labeled VOUT0 to VOUT3 are voltage output terminals (see Figure 5). The voltage
output range for each channel is software-programmable for either bipolar or unipolar. The bipolar range is
±10 V, and the unipolar range is 0 to 10 V. The channel outputs may be updated individually or simultaneously.
Digital I/O terminals (DIO0 to DIO7)
You can connect up to eight digital I/O lines to the screw terminals labeled DIO0 to DIO7 (pins 21 through 28).
You can configure each digital bit for either input or output.
When you configure the digital bits for input, you can use the digital I/O terminals to detect the state of any
TTL-level input. Refer to the switch shown in Figure 6 and the schematic shown in Figure 8. When the switch
is set to the +5 V USER input, DIO7 reads TRUE (1). If you move the switch to DGND, DIO7 reads FALSE
(0).
Pin 53
DGND
Pin 56
+5V Pin 28
DIO7
Figure 6. DIO7 detecting the state of a switch
+5V DGND
DIO7
Figure 7. Schematic showing DIO7 detecting the state of
a switch