ABB C100 - 2 ELECTRICAL INSTALLATION; 2.2 Two-wire and Four-wire Connection

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…2 ELECTRICAL INSTALLATION
Fig. 2.2a Four-wire Operation – Panel Mounted Instruments
Host Computer
+5V
0V
'A
'B
1.8kΩ
Pull-down
Resistor
1.8kΩ Pull-up
Resistor
0V
+5V
0V
'A
'B
1.8kΩ
Pull-down Resistor
1.8kΩ
Pull-up
Resistor
20
21
22
23
24
Rx+
Rx–
Tx–
C100/V100
Tx+
C150
GND
Host Computer
+5V
0V
'A
'B
1.8kΩ
Pull-down
Resistor
1.8kΩ Pull-up
Resistor
0V
+5V
0V
'A
'B
1.8kΩ
Pull-down Resistor
1.8kΩ
Pull-up
Resistor
Rx+
Rx–
Tx–
Tx+
GND
9 10 11 12 13
Fig. 2.2b Four-wire Operation – Wall-/Pipe-Mounted Instruments
…2.2 Two-wire and Four-wire Connection