Siemens SIPROTEC 7SJ80 Produktinformation Seite 25

Assignment of the port A and B sockets
Pin-No. RS232 RS 485
1 Shield (electrically connected with shield shroud)
2 RxD
3 TxD A/A' (RxD/TxD-N) B/B' (RxD/TxD-P)
4 –
5 GND C/C' (GND)
6 –
7 RTS
8 CTS B/B' (RxD/TxD-P) A/A' (RxD/TxD-N)
9 –
1)
Pin 7 also carries the RTS signal with RS 232 level when operated as
RS 485 interface. Pin 7 must therefore not be connected!
USB-DIGSI-Interface
The USB interface can be used to establish a connection between the
protection device and your PC. For the communication, the Microsoft
Windows USB driver is used which is installed together with DIGSI (as of
version V4.82). The interface is installed as a virtual serial COM port. We
recommend the use of standard USB cables with a maximum length of 5
m / 16 ft.
Port A
The Ethernet interface (RJ45) serves:
a) for DIGSI communication directly or via a network
b) for connection up to two RTD-Boxes directly or via switch (7SK80)
c) for DIGSI communication and connection of RTD-Boxes via switch
simultaneously (7SK80).
Port B
Port B serves:
a) as a system interface e.g. to transmit all device data to a central
evaluator or a control center. This interface may be provided with
various
particular application.
b) to connect up to two RTD-Boxes via RS 485 (7SK80)
c) for DIGSI communication.
SIPROTEC 7SJ80 / 7SK80 V4.60, Product Information
E50417-K1150-C342-A6, Edition 07.2010
Profibus DP,
RS 485
– –
– CNTR-A (TTL)
C/C' (GND)
– +5 V (max load
<100 mA)
1)
– –
– –
protocols and physical transmission schemes to suit the
Modbus RS 485 Ethernet
DNP3.0 RS 485
Port A and B
Tx+
– Tx–
A Rx+
RTS (TTL Pegel) —
GND1 —
VCC1 Rx–
– —
B —
– not available
IEC 60870–5–103
redundant
B/B' (RxD/TxD-P)
A/A' (RxD/TxD-N)
–
–
–
–
–
–
not available
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