External components, Usb connector, Screw terminals – Measurement Computing USB-1408FS User Manual
Page 10
USB-1408FS User's Guide
Functional Details
10
External components
The external components – screw terminal banks, LED, and USB connector –are shown in Figure 2.
1
Screw terminal pins 21 to 40
3
Screw terminal pins 1 to 20
2
LED
4
USB connector
Figure 2. External components
USB connector
The USB connector provides +5V power and communication. No external power supply is required.
LED
The LED indicates the communication status; it cannot be disabled. LED states are listed in the table below.
LED behavior
LED Illumination
Indication
Steady green
The USB-1408FS is connected to a computer or external USB hub.
Blinks continuously
Data is being transferred.
Screw terminals
The screw terminals provide the following connections:
Eight analog input connections (
CH0 IN
to
CH7 IN
)
Two analog output connections (
D/A OUT 0
to
D/A OUT 1
)
16 digital I/O connections (
PortA0
to
Port A7
, and
Port B0
to
Port B7
)
One external trigger input (
TRIG_IN
)
One SYNC I/O for external clocking and multi-unit synchronization (
SYNC
)
One external event counter input (
CTR
)
One voltage output (
2.5VREF
)
One power output (
PC+5 V
)
Five analog ground connections (
AGND
) and four ground connections (
GND
)
Use 16 AWG to 30 AWG wire when making connections to the screw terminals. The single-ended mode pinout
is shown in Figure 3.