Pull-Up And Pull-Down Resistors - ABB DATUM L150 Operating Manual

...2.4 Pull-up and Pull-down Resistors

20
21
22
23
24
9 10 11 12 13
Tx+
Tx–
Rx+
Rx–
GND
Fig. 2.2a Four-wire Operation – L150
Rx+
Rx–
GND
Tx+
Tx–
Fig. 2.2b Four-wire Operation – L160
2 ELECTRICAL INSTALLATION...
+5V
1.8kΩ Pull-up
0V
Resistor
+5V
1.8kΩ
0V
Pull-up
Resistor
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
'A
1.8kΩ
Pull-down
Resistor
'B
'A
Host Computer
'B
5