Siemens SIPROTEC 7SD610 - Page 287

3.2 Checking Connections
287
7SD610 Manual
C53000-G1176-C145-4
•RTS = Request to Send
•CTS
= Clear to Send
• GND = Signal / Chassis Ground
The cable shield is to be earthed at both line ends. For extremely EMC-prone envi-
ronments, the earth may be connected via a separate individually shielded wire pair to
improve immunity to interference.
Table 3-12 The assignments of the D-subminiature and RJ45 connector for the various interfaces
1)
Pin 7 may also carry the RS232 RTS signal on an 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). It is necessary to check that the termi-
nating resistors are connected to the bus only at the last unit, and not at other devices
on the bus. The jumpers for the terminating resistors are on the interface module (see
Figure3-8 or Figure 3-9) or directly on the C-CPU-2 (see Figure 3-4 and Table 3-7).
Terminating resistors can also be implemented outside the device (e.g. in the plug con-
nectors) as shown in Figure 3-5. In this case, the terminating resistors located on the
module must be disabled.
If the bus is extended, make sure again that only terminating resistors at the last
device to the bus are switched in.
Time Synchronisa-
tion Interface
It is optionally possible to process 5 V, 12 V or 24 V time synchronization signals, pro-
vided that these are connected to the inputs named in the following table.
Table 3-13 D-subminiature connector assignment of the time synchronization interface
1)
only for PPS signal (GPS)
Pin No. Operating
Interface
RS232 RS485 PROFIBUS DP Slave, RS485 DNP3.0/MOD-
BUS, RS485
Ethernet EN100
1 Shield (with shield ends electrically connected) Tx+
2RxDRxD - - - Tx-
3 TxD TxD A/A’ (RxD/TxD-N) B/B’ (RxD/TxD-P) A Rx+
4 - - - CNTRA-(TTL) RTS (TTL level) -
5 GND GND C/C’ (GND) C/C’ (GND) GND1 -
6 - - - +5 V (max. load < 100 mA) VCC1 Rx-
7RTS
RTS -
1)
---
8CTS
CTS B/B’ (RxD/TxD-P) A/A’ (RxD/TxD-N) B -
9 - - - - - Disabled
Pin No. Designation Signal significance
1 P24_TSIG Input 24 V
2 P5_TSIG Input 5 V
3 M_TSIG Return line
4 M_TSYNC
1)
Return line
1)
5 SCREEN Screen potential
6- -
7 P12_TSIG Input 12 V
8 P_TSYNC
1)
Input 24 V
1)
9 SCREEN Screen potential
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