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3 Installation and Commissioning
3.2
Checking Connections
3.2.1
Checking the data connections of the serial interfaces
3.2.2
Operating interface
3.2.3
Service / Function interface
3.2.4
System interface
112
The following tables list the pin-assignments for the various serial interfaces of the
device and the time synchronization interface. The position of the connections can be
seen in the following figure.
Figure 3-12
9-pin subminiature sockets
When the recommended communication cable is used, correct connection between
®
the SIPROTEC
4 device and the PC is automatically ensured. See the Appendix,
Section A.1 for an ordering description of the cable.
Check the data connection if the service is used to communicate with the device via
hard wiring or a modem. The same applies for the IRC connection.
When a serial interface of the device is connected to a central substation control
system, the data connection must be checked. A visual check of the transmit channel
and the receive channel is important. With RS232 and fibre optic interfaces, each con-
nection is dedicated to one transmission direction. The data output of one device must
be connected to the data input of the other device, and vice versa.
With data cables, the connections are designated according to DIN 66 020 and ISO
2110:
• TxD = Data output
• RxD = Data input
• RTS = request to send
6MD665 Manual
C53000-G1876-C103-3
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