Theodor Friedrichs COMBILOG 1020, Hardware Manual

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Hardware Manual COMBILOG 1020
29
RS-485 Busverbindung
A
B
A'
B'
ERR
RUN
TH. FRIEDRICHS & CO.
COMBILOG 1020
D I G I T A L
A I N 8
A I N 7 A I N 6 A I N 5 A I N 4 A I N 3 A I N 2 A I N 1
A N A L O G
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MEMORY CARD / PCMCIA
Display
2 x 16 Character
C
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M
T
X
R
X B A
0
V
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1
0.
.1
8V
SUPPLY RS 485 RS 232
I/O
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I/O
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I/O
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I/O
5
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0.1 AM
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V
Figure 3.4 Connection of the datalogger to the bus by a stub cable
3.8 Sensor Connection
The analog and digital signal inputs and outputs are wired ac-
cording to measurement task, to the transducer (sensor) that is
used, and to the number of connected sensors. The pinout arran-
gements for the various types of measurement are described in
chapter 5. The respectively valid pin assignment is determined by
means of the configuration software.
Since the digital outputs are "passive" the processing of external
elements always requires an external current supply. In case of
larger loads this should be independent of the datalogger supply.
RS-485 bus connection