Siemens SIPART DR22 Manual page 166

2 Installation
2.2 Electrical Connection
2.2.4 Connection of the interface
-- RS 485 bus
Can be inserted in slot 4
Figure 2-39 Jumper settings serial interface module 6DR2803-8C in RS 485 bus
SES
Instrument 1
Jumper setting RS 485
SES
Instrument 2
to
SES
Instrum. 32
Jumper setting RS485 +
150R
9-pin bus plug for
Figure 2-40 RS 485 bus connection diagram
164
8 Rxd/Txd-A
3 Rxd/Txd-B
8 Rxd/Txd-A
3 Rxd/Txd-B
8 Rxd/Txd-A
3 Rxd/Txd-B
round cable C73451-A347-D39
RS 485 Bus ≤1000 m
Note line termination:
The RS 485 bus must be terminated with its characte-
ristic impedance. To do this, the terminating resistor
in the "last" bus user is switched by plugging the co-
ding bridge appropriately.
Manual
Rxd/Txd-A
Rxd/Txd-B
Remote system
SIPART DR22 6DR2210
C79000-G7476-C154-03