7SG12 DAD-N Communication Interface
©2010 Siemens Protection Devices Limited Chapter 4 Page 10 of 10
Serial optical fibre link
Tx
Tx
TxTx
Rx Rx
RxRx
`
Laptop computer
Desktop PC
INTRANET
Desktop PC
RS232
10BaseT
Local
RS232
10BaseT
Ethernet
SIGMA 3
RS232
RS232
LANTRONIX
UDS-10
or equiv.
Figure 7 – LAN Network connectivity using a SIGMA-3 + Lantronix UDS-10 or equivalent
A SIGMA-3 unit may be used to as shown in Figure 7 to connect Argus and Modular II protection relays to a local
area network via an Ethernet to RS232 convertor such as the Lantronix UDS-10 or similar device. SIGMA-3 units
may be used on a per bay or per substation basis. They provide a single point of contact to the protection relays
for monitoring and diagnostic purposes.
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