Installation and Commissioning
8-20 7SA522 Manual
C53000-G1176-C119-2
8.2 Checking the Connections
8.2.1 Data Connections
The following tables list the pin-assignments for the various serial interfaces of the de-
vice and the time synchronization interface.
PC Operating Inter-
face at Front
When the recommended communication cable is used, correct connection between
the SIPROTEC
®
device and the PC is automatically ensured. See the Appendix, Sub-
section A.1.3 for an ordering description of the cable.
System (SCADA)
Interface
When a serial interface of the device is connected to a central substation control sys-
tem, the data connection must be checked. A visual check of the transmit channel and
the receive channel is important. Each connection is dedicated to one transmission di-
rection. The data output of one device must be connected to the data input of the other
device, and vice versa.
The data cable connections are designated in sympathy with DIN 66020 and ISO
2110 (see also Table 8-8):
− TxD data transmit
− RxD data receive
− RTS
request to send
− CTS
clear to send
− DGND signal/chassis ground
The cable shield is to be grounded at only one end so that potential differences cannot
cause circulating currents to flow along the shield.
The physical arrangement of the connectors is illustrated in Sub-section 2.1.5, Figure
2-15.
*) Pin 7 also may carry the RS232 RTS signal to an RS485 interface. Pin 7 must therefore
not be connected!
Table 8-8 Installation of the D-subminiature ports
Pin No. Operating
interface
RS232 RS485 Profibus FMS Slave, RS485
1 Shield (with shield ends electrically connected)
2RxD RxD ––
3 TxD TxD A/A' (RxD/TxD–N) B/B' (RxD/TxD–P)
4 – – – CNTR–A (TTL)
5 DGND DGND C/C' (DGND) C/C' (DGND)
6 – – – +5 V (max. load 100 mA)
7RTS
RTS –*) –
8CTS
CTS B/B' (RxD/TxD–P) A/A' (RxD/TxD–N)
9– – – –
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