USB-1408FS-Plus 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
Receives the supplied USB cable. When connected to a computer or USB hub, the cable pr5 V power
and communication. No external power supply is required.
LED
The following table lists the behavior of the device LED.
LED state
Indication
Steady green
The device 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
,
CH0
IN
HI/LO
through
CH3
IN HI/LO
)
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
)
External trigger input (
TRIG_IN
)
External counter input (
CTR
)
Bidirectional terminal for external clocking or multi-unit synchronization (
SYNC
)
Power output (
+VO
)
Analog ground (
AGND
) and ground (
GND
)
Use 16 AWG to 30 AWG wire when making connections to the screw terminals.
