Terminating Resistors; Voltage Supply - JUMO mTRON T Operating Manual

4.3.3

Terminating resistors

The internal terminating resistors for the Com1 and Com2 interfaces are only relevant for
RS422/485.
The terminating resistors are deactivated by default. To activate them, DIP switches 1 to 4 for
the relevant interface must be pushed upward using a suitable tool such as a ballpoint pen (ON
position).
The following figure shows the position of the DIP switches when the terminating resistors are
activated.
NOTE!
To ensure fault-free operation, terminating resistors are required at the start and end of an
RS422/485 transmission path.
Internal terminating resistors
4.3.4

Voltage supply

Connection Terminals
24 V DC +24 V and GND
+5 V
332 ?
1
120 ?
2
332 ?
GND
Symbol and terminal designation
+
U
-
4 Electrical connection
ON
1 2 3 4
+5 V
332 ?
3
120 ?
8
332 ?
GND
+24 V
x
GND
4
3
9
4
41