Omega OM-USB-1208FS manual Main connector and pin out, Analog input terminals CH0 in CH7

OM-USB-1208FS User's Guide Functional Details

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 (PortA0 to Port A7, and Port B0 to Port B7)

One power connection (PC+5 V)

Three ground connections (GND)

Main connector and pin out

Connector type	Screw terminal
Wire gauge range	16 AWG to 30 AWG

8-channel single-ended mode pin out 4-channel differential 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 (CH0 IN through CH7 IN.) Refer to the pinout diagrams above for the location of these pins.

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 12-bit resolution. When configured for single-ended mode, each analog input has 11-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 CHn IN.

The second wire connects to AGND.

The input range for single-ended mode is ±10 V. No other ranges are supported in single-ended mode.

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