Siemens SINAMICS DCM Operating Instructions Manual page 138

Connecting
6.16 Connector assignment (terminals, Faston mounting tabs, ribbon cables)
Serial interface to AOP30/USS interface
Table 6- 22 Terminal X178
Terminal Function
X178
1 Supply (output)
2 Ground, AOP M
3 RX+/TX+
4 RX-/TX-
5 Ground, digital M
6 Ground, digital M
"Control Unit (CUD)" module
Table 6- 23 Terminal X179
Terminal Function
X179
1 Supply (output)
2 Ground, digital M
3 TXD1
4 RXD1
5 TXD2
6 RXD2
"Control Unit (CUD)" module
Note
Only one of the two interfaces – RS485 (X178-3, 4) or RS232 (X179-3, 4) – may be used.
Figure 6-43 Arrangement X178 and X179
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Technical specifications
24 V DC short-circuit proof, maximum load 200 mA
Internal supply related to internal ground terminal
Send and receive cable, RS485, two-wire
Positive differential input/output
Send and receive cable, RS485, two-wire
Negative differential input/output
Technical specifications
4.4 to 5.4 V DC short-circuit proof, maximum load 300 mA
Internal supply related to internal ground terminal
Send cable, RS232 standard (V.24)
Receive cable, RS232 standard (V.24)
Send cable, RS232 standard (V.24)
Receive cable, RS232 standard (V.24)
SINAMICS DCM Control Module
Operating Instructions, 12/2018, A5E34888669A