Checking Connections; Checking Data Connections Of Serial Interfaces - Siemens siprotec 7SD5 User Manual

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
Figure 3-18
Operator Interface When using the recommended communication cable (see order no. in the Appendix
A.1), the correct connection between the SIPROTEC
is automatically ensured.
Service Interface Check the data connection if the service interface (Interface C) for communicating with
the device is 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
7SD5 Manual
C53000-G1176-C169-1
9-pin D-subminiature female connectors
Ethernet connector
3.2 Checking Connections
®
4 device and the PC or Laptop
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