Interfaces; Voltage Supply; Terminating Resistors - JUMO variTRON 500 Montageanleitung

3 Electrical connection
3.3.2

Interfaces

Connection Designa-
tion
USB host (2 ×) USB
Ethernet LAN1,
(LAN2 optional) LAN2
Serial interface Com1,
RS232 Com2
(optional)
Serial interface Com1,
RS485 Com2
(optional)
3.3.3

Voltage supply

Connection Designa-
tion
Voltage supply In +24 V and
GND
3.3.4

Terminating resistors

The internal terminating resistors for the Com1 and Com2 interfaces are only available for RS485.
The terminating resistors are deactivated per default. To activate them, switches 1 and 2 for the relevant
interface must be closed.
NOTE!
To ensure fault-free operation, terminating resistors are required at the beginning and end of an RS485
transmission path.
24
Num- Connection element
ber
(12),
(13)
(8),
(7)
(11),
(9)
(11),
(9)
Num- Symbol and terminal designation
ber
(6)
+
U
-
332
120
332
Assignment
1 TX+
2 TX-
3 RX+
6 RX-
2 RxD
3 TxD
5 GND
3 TxD+/RxD+
5 GND
8 TxD-/RxD-
+24 V
x
GND
+5 V
?
3
1
?
8
2
?
GND
Transmission data +
Transmission data -
Received data +
Received data -
Received data
Transmission data
Ground
Transmission/received data
+
Ground
Transmission/received data -