Siemens siprotec SJ62 User Manual page 418

Additional Interface
(only 7SJ64)
Pin No. RS232
1 Shield (with shield ends electrically connected)
2 RxD
3 TxD
4 –
5 GND
6 –
7 RTS
8 CTS
9 –
Termination
Time Synchroniza-
tion Interface
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
With data cables, the connections are designated according to DIN 66020 and ISO
2110:
• TxD = Data output
• RxD = Data input
• RTS = Request to send
• CTS = Clear to send
• GND = Signal/Chassis Ground
The cable shield is to be grounded at both ends. For extremely EMC-prone environ-
ments, the GND may be connected via a separate individually shielded wire pair to
improve immunity to interference.
The additional interface available only for 7SJ64 (port D) serves for signal injection of
one or two RTD-boxes. The connection is performed according to one of the connec-
tion examples given in the Appendix A.3.
Table 3-35 Assignments of the connectors to the various interfaces
RS485 PROFIBUS FMS Slave,
PROFIBUS FMS Slave,
–
A/A' (RxD/TxD-N)
–
C/C' (GND)
– +5 V (max. load < 100 mA)
1)
–
B/B' (RxD/TxD-P)
–
1)
Pin 7 also carries the RTS signal with RS232 level when operated as RS485 Interface. Pin 7
must therefore not be connected!
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). Verify that only the last device on the bus
has the terminating resistors connected, and that the other devices on the bus do not.
The jumpers for the terminating resistors are on the interface module RS485 (see
Figure 3-22) or on the Profibus RS485 (see Figure 3-24) or with the 7SJ64 directly on
the C–CPU-2 (see Figure 3-16 and Table 3-23). The terminating resistors can also be
connected externally (e.g. to the connection module as illustrated in Figure 3-17). In
this case, the terminating resistors located on the module must be disconnected.
If the bus is extended, make sure again that only the last device on the bus has the
terminating resistors switched-in, and that all other devices on the bus do not.
It is optionally possible to process 5 V-, 12 V- or 24 V- time synchronization signals,
provided that they are carried to the inputs named in the following table.
RS485
RS485
–
B/B' (RxD/TxD-P)
CNTR-A (TTL)
C/C' (GND)
–
A/A' (RxD/TxD-N)
–
3.2 Checking Connections
Modbus RS485 Ethernet
EN 100
DNP3.0 RS485
–
A
RTS (TTL level)
GND1
VCC1
–
B
– not available
Tx+
Tx–
Rx+
—
—
Rx–
—
—
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