ABB COMMANDER 100 Operating Manual page 6

...2 ELECTRICAL INSTALLATION
...2.2 Two-wire and Four-wire Connection
C100/V100
20
21
22
23
24
Fig. 2.2a Four-wire Operation – Panel Mounted Instruments
9 10 11 12 13
Fig. 2.2b Four-wire Operation – Wall-/Pipe-Mounted Instruments
4
C150
Tx+
Tx–
Rx+
Rx–
GND
Rx+
Rx–
GND
Tx+
Tx–
+5V
1.8kΩ Pull-up
0V
Resistor
'A
1.8kΩ
Pull-down
+5V
Resistor
1.8kΩ
0V
Pull-up
Resistor 'B
'A
1.8kΩ
Pull-down Resistor
0V
+5V
1.8kΩ Pull-up
0V
Resistor
'A
1.8kΩ
Pull-down
+5V
Resistor
1.8kΩ
0V
Pull-up
Resistor
'B
'A
1.8kΩ
Pull-down Resistor
0V
Host Computer
'B
Host Computer
'B