3 Mounting and Commissioning
396
7SA522 Manual
C53000-G1176-C155-3
3.2 Checking Connections
3.2.1 Checking Data Connections of Serial Interfaces
The tables of the following margin headings list the pin-assignments for the different
serial interfaces of the device and the time synchronization interface. The position of
the connections can be seen in the following Figure.
Figure 3-17 9-pin D-subminiature female connectors
Operator Interface When using the recommended communication cable (see order no. in the Appendix
A.1), the correct connection between the SIPROTEC
®
4 device and the PC or Laptop
is automatically ensured.
S e r v i c e I n t e r f a c e Check the data connection if the service interface (Interface C) for communication with
the device via fix wiring or a modem.
System Interface For versions equipped with a serial interface to a control center, the user must check
the data connection. The visual check of the assignment of the transmission and re-
ception channels is of particular importance. With RS232 and fibre optic interfaces,
each connection is dedicated to one transmission direction. Therefore the output of
one device must be connected to the input of the other device and vice versa.
With data cables, the connections are designated according to DIN 66020 and ISO
2110:
• TxD = Data Transmit
• RxD = Data Receive
•RTS
= Request to Send
•CTS
= Clear to Send
• GND = Signal / Chassis Ground
The cable shield is to be grounded 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.
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