Main Connector And Pin Out; Analog Input Terminals (Ch0 In - Ch7 In) - Measurement Computing USB-1408FS User Manual

USB-1408FS User's Guide
Screw terminal – pins 21-40
The screw terminals on the bottom edge of the (pins 21 to 40) provide the following connections:

16 digital I/O connections (

One power connection (

Three ground connections (

Main connector and pin out

Connector type
Wire gauge range
8-channel single-ended mode pin out

Analog input terminals (CH0 IN - CH7 IN)

You can connect up to eight analog input connections to the screw terminal containing pins 1 to 20 (
through .) Refer to the
CH7 IN
You can configure the analog input channels as eight single-ended channels or four differential channels. When
configured for differential mode, each analog input has 14-bit resolution. When configured for single-ended
mode, each analog input has 13-bit resolution, due to restrictions imposed by the A/D converter.
Single-ended configuration
When all of the analog input channels are configured for single-ended input mode, eight analog channels are
available. The input signal is referenced to signal ground (GND), and delivered through two wires:

The wire carrying the signal to be measured connects to CH# IN.

The second wire connects to AGND.
The input range for single-ended mode is ±10 V. No other ranges are supported in this mode. Figure 5
illustrates a typical single-ended measurement connection.
to , and
PortA0 Port A7
)
PC+5 V
)
GND
Screw terminal
16 AWG to 30 AWG
"Main connector and pin
16
to )
Port B0 Port B7
4-channel differential mode pin out
out" diagrams above for the location of these pins.
Functional Details
CH0 IN