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8.2
Checking Connections
8.2.1
Data Connections
PC Interface at
Front
SCADA Interface
7SJ63 Manual
C53000-G1140-C120-1
Table 8-10 shows the pin-assignments for the various serial interfaces of the device.
Table 8-11 refers to the time synchronization interface.
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.
When a serial interface of the device is connected to a SCADA, the data connection
must be checked. A visual check of the transmit channel and the receive channel is
important. For an optical fiber interface, each connection is dedicated to one transmis-
sion direction. The data output of one device must be connected to the data input of
the other device, and vice versa.
The data cable connections must conform to DIN 66020 and ISO 2110 (see also Table
8-10):
− 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.
Table 8-10
Installation of the D-Subminiature Port
Pin No.
PC Inter-
face at Front
1
2
RxD
3
TxD
4
–
5
DGND
6
–
7
–
8
–
9
–
*) Pin 7 also can carry the RS 232 RTS signal to an RS 485 interface. Pin 7 must therefore
not be connected!
RS 232
RS 485
Shield (with shield ends electrically connected)
RxD
–
TxD
A/A' (RxD/TxD–N)
–
–
DGND
C/C' (DGND)
–
–
RTS
–*)
CTS
B/B' (RxD/TxD–P)
–
–
Installation and Commissioning
Profibus FMS Slave, RS 485
–
B/B' (RxD/TxD–P)
CNTR–A (TTL)
C/C' (DGND)
+ 5V voltage supply
(max. load < 100 mA)
–*)
A/A' (RxD/TxD–N)
–
8-19
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