Siemens SIMADYN D Hardware Manual page 182

Communications support modules
6-34
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Resistor to the
supply voltage
Bus terminating resistor
Resistor to the
signal reference
Fig. 6-11 RS 485 bus termination
SS4
Fig. 6-12 Connector assignment SS4 with bus termination
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+5V
390
150
390
0V
22
390
5
8
150
21
17
390
18
7
14
2
20
Industry Automation
RS485+
RS485-
RS485+
USS bus
RS485-
Hardware - SIMADYN D
Edition 12.2004
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