Digital I/O Terminals (Dio0 - Dio3) - Measurement Computing miniLAB 1008 User Manual

miniLAB 1008 User's Guide
Since the analog inputs are restricted to a −10 V to +20 V signal swing with respect to
ground, all ranges except ±20 V can realize a linear output for any differential signal
with zero common mode voltage and full scale signal inputs. The ±20 V range is the
exception. You cannot put −20 V on CHHI, and 0 V on CHLO, since this violates the
input range criteria. Table 4-3 shows some possible inputs and the expected results.
CHHI
-20 V
-15 V
-10 V
-10 V
0 V
0 V
+10 V
+10 V
+15 V
+20 V
Additional information on analog signal connections
For general information regarding single-ended and differential inputs, refer to the
Guide to Signal Connections (available on our web site at
www.mccdaq.com/signals/signals.pdf).

Digital I/O terminals (DIO0 - DIO3)

Connect up to four digital I/O lines to the screw terminals containing pins DIO0 to
DIO3. Refer to the
configure each digital channel independently for either input or output.
Overvoltage/short circuit protection is provided with a 1.5 kΩ series resistor on each I/O
pin. Use of the resistor may limit the value of the output current, however. For example,
if the output current is 1 mA, the resistor drops 1.5 V, resulting in an output of 3.5 V.
You can use the digital I/O terminals to detect the state of any TTL level input. In Figure
4-8, if the switch is set to the +5 V input, and the DIO0 reads TRUE (1). If the switch is
moved to GND, the DIO0 reads FALSE.
Table 4-3. 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
pinout diagrams on page 4-6 for the location of these pins. You can
4-10
Functional Details
Result
Invalid
Invalid
-10 V
-20 V
-10 V
-20 V
+20 V
+10 V
+20 V
+20 V