Siemens CU240S DP Instrucciones de operaciones Pagina 179

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Communication
6.6 Communication via USS
Control Units CU240S
Operating Instructions, 10/2007, A5E00766042B AC
179
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Figure 6-15 USS network via RS485
CAUTION
A difference in earth potential between master and the slaves in an RS485 network can
cause damage to the Control Unit of the Inverter. Care must be taken to ensure that the
master and slaves all have the same ground level.
6.6.2 SUB D connector for RS485 interface
Socket
The Control Units CU240S have a 9-pin female sub-D socket for connecting the inverter via
an RS485 interface.
Table 6-37 PIN assignment of the 9-pin sub-D socket
Pin Designation Description
1 - Unused
2 - Unused
3 RS485P Receive- and transmit signal (+)
4 - Unused
5 0 V Ground reference
6 - Unused
7 - Unused
8 RS485N Receive- and transmit signal (-)
9 - Unused
X Screen (casing) Potential equilisation
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