
USB-1608HS-2AO User's Guide Functional Details
14
USB active LED (ACT)
The ACT LED indicates the communication status of the USB-1608HS-2AO. The table below defines the
function of the ACT LED.
LED Illumination
The USB-1608HS-2AO is connected to a computer or external USB hub.
Data is being transferred.
Power LED (PWR)
The PWR LED lights up when the USB-1608HS-2AO is receiving +5 V of power from the AC power adapter.
Main connector and pin out
The USB-1608HS-2AO 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)
Four analog output connections (VDAC0_F, VDAC0_S, VDAC1_F, VDAC1_S) covering two DAC
channels—only two connections (VDAC0_F and VDAC1_F) needed if remote sensing is disabled
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-2AO screw terminal functions
USB connector
The USB connector is on the rear of the USB-1608HS-2AO. This connector provides communication..
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