Checking Connections; Data Connections - Siemens SIPROTEC 7SJ62 Instruction Manual
Multi-functional protective relay with bay controller
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Also See for SIPROTEC 7SJ62:
- Manual (704 pages) ,
- Technical data manual (58 pages) ,
- Manual (94 pages)
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8.2
Checking Connections
8.2.1
Data Connections
PC Interface at
Front
SCADA Interface
7SJ62 Manual
C53000-G1140-C121-1
Table 8-7 shows the pin-assignments for the various serial interfaces of the device.
Table 8-8 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. Each connection is dedicated to one transmission direction. The data out-
put 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
8-7):
− 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 8-7
Installation of the D-Subminiature Ports
Pin No.
PC Interface
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)
–
8-15
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