Handbuch / Manual
DIP switch S3:
Switch 3
Switch 4
Function
ON
ON
line termination activated for RS485
OFF
OFF
no line termination activated for RS485
ON
OFF
invalid
OFF
ON
invalid
S1 and S2 are not used.
The interface can work with all transmission rates.
Essential note: in order to maintain CE conformity, the cable connected
to the SUB-D plug/socket must have a shield which should be connected
to the plug housing at low-impedance.
On fiber optical network interface modules the transmission power can be
adjusted in 4 steps (very low, low (default setting), medium, high).
8.2 I/O Address Setting
Switch S1 is used for setting the I/O address by which the card can be
addressed. The assignment of single switches to addresses is indicated
21
RS485
Transceiver
Pin3/Sub-D
Connector
Pin4/Sub-D
Connector
240 Ohm
240 Ohm
150 Ohm
S1
S2
+5V,
RS485
GND,
RS485
RS485-Terminierung
