•
CTS = Clear to send
•
GND = Signal / Chassis Ground
The cable shield is to be earthed at both line ends. For extremely EMC-prone environments, the earth may be
connected via a separate individually shielded wire pair to improve immunity to interference.
Table 3-20 The assignments of the D-subminiature and RJ45 connector for the various interfaces
Pin No. Operator
interface
RS232 RS485 PROFIBUS FMS Slave, RS485 DNP3.0 RS485 Ethernet
EN 100
PROFIBUS DP Slave, RS485
1 Shield (with shield ends electrically connected) Tx+
2 RxD RxD - - - Tx-
3 TxD TxD A/A’ (RxD/TxD-N) B/B’ (RxD/TxD-P) A Rx+
4 - - - CNTR-A (TTL) RTS (TTL level) -
5 GND GND C/C’ (GND) C/C’ (GND) GND1 -
6 - - - +5 V (max. load < 100 mA) VCC1 Rx-
7 RTS RTS
-
1)
- - -
8 CTS CTS B/B’ (RxD/TxD-P) A/A’ (RxD/TxD-N) B -
9 - - - - - Non Exis-
tent
1)
Pin 7 also carries the RTS signal with RS232 level when operated as RS485 Interface. Pin 7 must therefore
not be connected!
RS485-Termination
The RS485 interface is capable of half-duplex service with the signals A/A' and B/B' with a common relative
potential C/C' (GND). Make sure that only the terminating resistors at the last device on the bus are connected,
but not for all other devices on the bus. The jumpers for the terminating resistors are on the interface module
(see Figure 3-12 or Figure 3-13) of directly on the C-CPU-2 (see Figure 3-5 and Table 3-7). Terminating resis-
tors can also be connected externally (e.g. to the terminal block, see Figure 3-6). In this case, the terminating
resistors located on the module must be disabled.
If the bus is extended, make sure again that only the terminating resistors at the last device on the bus are
connected.
Time Synchronization Interface
It is optionally possible to process 5 V, 12 V or 24 V time synchronization signals, provided that these are
connected to the inputs named in the following table.
Table 3-21
D-subminiature connector assignment of the time synchronization interface
Pin No. Description Signal meaning
1 P24_TSIG Input 24 V
2 P5_TSIG Input 5 V
3 M_TSIG Return line
4
-
1)
-
1)
5 SHIELD Shield potential
6 - -
7 P12_TSIG Input 12 V
8
P_TSYNC
1)
Input 24 V
1)
9 SHIELD Shield potential
1)
Assigned, but cannot be used
Mounting and Commissioning
3.2 Checking Connections
204 SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
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