ABB C1300 User Manual Supplement page 6

C1300
Advanced Circular Chart Recorder
C1300
Linked Out
– see Note
4
9
3
Links on Serial Module
Fig. 2.2 Pull-up and Pull-down Resistors (5-wire Operation)
4
Serial Module
Terminal Board
1
2
3
4
5
6
7
8
9
Note. If an RS422/485 adaptor card without pull-up and pull-down
resistors is used, the C1300's internal resistors can be linked in.
Computer Terminal or Host Computer
1.8kW Pull-down
Resistor
0V
+5V
Tx+
Tx–
Rx–
Rx+
GND
GND
2 Electrical Installation
'A'
'B'
+5V
1.8kW Pull-up
1.8kW Pull-up
Resistor
Resistor
'B'
'A'
0V
1.8kW Pull-down
Resistor
0V
IM/C1300–MOD Rev. C