User Manual

USB-201 User's Guide Functional Details
9
Screw terminals
The screw terminals provide the following connections:
 Eight single-ended analog inputs (CH0 to CH7)
 Eight digital I/O (DI00 to DI07)
 External pacer clock input (AICKI)
 External pacer clock output (AICKO)
 Digital trigger input (TRIG)
 Counter input (CTR)
 User voltage output (+VO)
 Analog ground reference (AGND) and digital ground reference (GND)
Figure 3. USB-201 pinout
USB connector
The USB connector provides +5 V power and communication. No external power supply is required.
LED indicators
The device has two LED indicators – Status and Activity.
 The Status LED turns on when the device is detected and installed on the computer.
 The Activity LED blinks when data is transferred, and is off otherwise.
Refer to Figure 2 on page 8 for the location of these LEDs.