Measurement Computing USB-1608HS - Manual (Page 14)

USB-1608HS User's Guide Functional Details
14
USB active LED (ACT)
The ACT LED indicates the communication status of the USB-1608HS. The table below defines the function of
the ACT LED.
LED Illumination
LED Illumination Indication
Steady green The USB-1608HS is connected to a computer or external USB hub.
Blinks continuously Data is being transferred.
Power LED (PWR)
The PWR LED lights up when the USB-1608HS is receiving +5 V of power from the AC power adapter.
Main connector and pin out
Connector type Screw terminal
Wire gauge range 16 AWG to 30 AWG
The USB-1608HS has one row of screw terminals that provide the following connections:.
 16 analog input connections (
CH0_L to CH7_L and CH0_H to CH7_H ) covering eight analog input
channels.
 10 analog ground connections (
AGND )
 Eight digital input connections (
DI0 to DI7 )
 Eight digital output connections (
DO0 to D07 )
 One external trigger source (
TRIG_IN )
 Two SYNC terminals for external clocking and multi-unit synchronization (
SYNC_IN and SYNC_OUT )
 One external event counter connection (
CTR )
 One voltage connection (
+5 V EXT )
 Three digital ground connections (
GND )
Signals are identified in Figure 4.
Figure 4. USB-1608HS screw terminal functions
USB connector
The USB connector is on the rear of the USB-1608HS. This connector provides communication.
1
1
GN
D
2
DI0
3
DI1
4
DI2
5
DI3
6
DI4
7
DI5
8
DI6
9
DI7
10
GN
D
11
D
O0
12
D
O1
13
D
O2
14
D
O3
15
D
04
16
D
O5
17
D
O6
18
D
O7
19
GN
D
20
SYN
C
_
IN
21
SYN
C
_O
U
T
22
+5
V
EXT
23
C
T
R
24
T
R
IG_
IN
25
N
/C
26
N/
C
27
A
G
N
D
28
N
/C
29
N
/C
30
A
G
N
D
31
C
H
0_L
32
C
H
0_H
33
A
G
N
D
34
C
H
1_L
35
C
H
1_H
36
A
G
N
D
37
C
H
2_L
38
C
H
2_H
39
A
G
N
D
40
C
H
3_L
41
C
H
3_H
42
A
G
N
D
43
C
H
4_L
44
C
H
4_H
45
A
G
N
D
46
C
H
5_L
47
C
H
5_H
48
A
G
N
D
49
C
H
6_
L
50
C
H
6_H
51
A
G
N
D
52
C
H
7_L
53
C
H
7_H
54
A
G
N
D