User Manual

PD42-x-1240 Hardware Manual • Hardware Version V1.20 | Document Revision V1.10 • 2018-DEC-05
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node
n - 1
node
n
Slave Slave
termination
resistor
(120R)
+5V
GND
pull-up (680R)
pull-down (680R)
RS485- / RS485B
termination
resistor
(120R)
RS485+ / RS485A
Figure 11: RS485 bus lines with resistor (bias) network on one side, only
Or add resistor network at both ends of the bus (like Profibus™ termination):
node
n - 1
node
n
Slave Slave
termination
resistor
(220R)
+5V
GND
pull-up (390R)
pull-down (390R)
RS485- / RS485B
RS485+ / RS485A
termination
resistor
(220R)
+5V
GND
pull-up (390R)
pull-down (390R)
Figure 12: RS485 bus lines with Profibus™recommended line termination
8.2 CAN
For remote control and communication with a host system the PD42-x-1240 provides a CAN bus interface.
Please note that the CAN interface is not available in case USB is connected. For proper operation the
following items should be taken into account when setting up a CAN network:
1. BUS STRUCTURE:
The network topology should follow a bus structure as closely as possible. That is, the connection
between each node and the bus itself should be as short as possible. Basically, it should be short
compared to the length of the bus.
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