Analog Output Terminals (D/A Out 0 And D/A Out 1); Digital I/O Terminals (Port A0 To A7, And Port B0 To B7) - Measurement Computing USB-1408FS User Manual

USB-1408FS User's Guide
CHHI
−20 V
−15 V
−10 V
−10 V
0 V
0 V
+10 V
+10 V
+15 V
+20 V
For more information on analog signal connections
For more information on single-ended and differential inputs, refer to the Guide to Signal Connections (this
document is available on our web site at www.mccdaq.com/signals/signals.pdf)

Analog output terminals (D/A OUT 0 and D/A OUT 1)

You can connect up to two analog output connections to the screw terminal pins 13 and 14 (
). Refer to the "Main connector and pin
OUT 1
Each channel can be paced individually at rates up to 10,000 updates per second. Both channels can be paced
simultaneously using the same time base at 5000 updates per channel. The 0-4.096 V output range provides a
convenient 1 mV per LSB when setting the output voltage levels.

Digital I/O terminals (Port A0 to A7, and Port B0 to B7)

You can connect up to 16 digital I/O lines to the screw terminal containing pins 21 to 40 (
and Port B0 to Port B7
these pins. You can configure each digital port for either input or output.
When you configure the digital bits for input, you can use the digital I/O terminals to detect the state of any
TTL level input. Refer to the switch shown in Figure 9 and the schematic shown in Figure 10. If the switch is
set to the +5 V input, Port A0 reads TRUE (1). If you move the switch to GND, Port A0 reads FALSE.
Figure 9. Digital connection Port A0 detecting the state of a switch
Sample inputs and differential results
CHLO
0 V
+5 V
0 V
+10 V
+10 V
+20 V
−10 V
0 V
−5 V
0
out" diagrams on page 16 for the location of these pins.
.) Refer to the "Main connector and pin
Pin 40
GND
Pin 30
PC +5V
Result
In Valid
In Valid
−10 V
−20 V
−10 V
−20 V
+20 V
+10 V
+20 V
+20 V
out" diagrams on page 16 for the location of
Pin 21
PORT A0
19
Functional Details
D/A OUT 0 and D/A
Port A0 to Port A7 ,