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Here too, the channel is selected via the channel byte added to the command
for measuring the voltage. You can find the corresponding values in fol-
lowing table:
Channel Byte
8
dez
9
dez
10
dez
11
dez
12
dez
13
dez
14
dez
15
dez
Table 6.2 A/D converter differential measurement
Serving as an example now the difference between
two voltages shall be measured at the inputs AIN05
and AIN06. For this purpose, connect the first voltage
to AIN05 and the second one to AIN06 (see figure
6.2-2).
Now either the value 12
(AIN05- / AIN06+, the result is a negative differential
voltage!) can be used as channel byte.
Attention:
Please take particular care to ensure, that the difference between the inputs
is whithin the input voltage range. An input voltage of +10V at AIN05 and
an input voltage of -10V at AIN06 results in a difference of +20V, i.e. an
input voltage range of +/- 20.4V must be chosen (see chapter 6.4)
EXDUL-581E / EXDUL-581S © 2019 by Messcomp Datentechnik GmbH
Differential channel selection
1
2
3
+
-
-
+
+
-
(AIN05+ / AIN06-) or 13
dez
wasco
4
5
6
-
+
+
-
-
+
7
8
ADGND
+
-
-
+
AIN05
AIN06
dez
AGND
Fig. 6.2-2
®
+10V
EV03
24
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