Measurement Computing USB-202-OEM - Manual (Page 11)

USB-202-OEM User's Guide Functional Details
11
Connector W3
Header connector W3 provides connections for the analog inputs, analog outputs, and the analog ground
reference.
W3 pinout
Pin Signal name Pin description Pin Signal name Pin description
1 CH0 Channel 0 2 CH1 Channel 1
3 AGND Analog ground 4 CH2 Channel 2
5 CH3 Channel 3 6 AGND Analog ground
7 CH4 Channel 4 8 CH5 Channel 5
9 AGND Analog ground 10 CH6 Channel 6
11 CH7 Channel 7 12 AGND Analog ground
13 AOUT0 Analog output 0 14 AGND Analog ground
15 AOUT1 Analog output 1 16 AGND Analog ground
Figure 4. Connector W3 pinout
Screw terminal connectors
Screw terminals J1 through J8 are unpopulated. When populated the screw terminals provide alternative
connections to the header connectors. Refer to the Specifications chapter for screw terminal pinouts.
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 10 for the location of these LEDs.
Signal connections
Analog input
You can connect up to 8 single-ended inputs to screw terminals CH0 to CH7 . The input voltage range is ±10 V.
Single-ended mode requires two wires; connect one wire to the signal you want to measure ( CHx ), and connect
a second wire to the analog ground reference ( AGND ).
External pacer I/O
The USB-202-OEM provides one external clock input ( AICKI ) and one clock output ( AICKO ) for the analog
input pacer. You can connect an external clock signal to AICKI .
When using the internal clock, AICKO outputs the ADC sample clock.
Analog output
The USB-202-OEM has two 12-bit analog outputs ( AOUT0 and AOUT1 ). Both outputs can be updated
simultaneously at a rate of 125 S/s per channel. One output can be updated at a rate of 250 S/s. The output range
is fixed at 0 V to 5 V. The outputs default to 0 V when the host computer is shut down or suspended, or when a
reset command is issued to the device.