JUMO 705003, Operating Manual, Page: 30 / 112

3 Electrical connection
30
3.3.3 Voltage supply
3.3.4 Terminating resistors
The terminating resistors of the RS485 interface are deactivated per default. To activate them, switches
1 and 2 must be closed.
The switches are located inside the housing and are accessible through the ventilation slots (1).
NOTE!
To ensure fault-free operation, terminating resistors are required at the beginning and end of an RS485
transmission path.
Connection Designa-
tion Num-
ber Symbol and terminal designation
Voltage supply In +24 V and
GND
(4) +24 V
GND
U
+
-
x
330
?
120
?
330
?
GND
+5 V
1
2
1
2
(1)