Measurement Computing USB-231 - Manual (Page 11)

USB-231 User's Guide Functional Details
11
External components
The external components on the USB-231 are shown in Figure 3.
1 Screw terminal pins 1 to 16 3 LED Indicator
2 Screw terminal pins 17 to 32 4 USB connector
Figure 3. USB-231 external components
Screw terminals
The screw terminals provide the following connections (refer to Figure 4 and Figure 5 for pinout diagrams):
 Eight single-ended/four differential analog inputs (
CH0H/CH0L to CH3H/CH3L )
 Two analog outputs (
AOUT0 and AOUT1 )
 Digital trigger input ( TRIG )
 Counter input ( CTR )
 User voltage output
(+VO )
 Analog ground reference (
AGND ) and digital ground reference ( GND )
Caution! To ensure the specified EMC performance, the length of any wire or cable connected to the screw
terminal connector must be no longer than 0.5 m (20 in.).