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4.3 Communications
9mm SMA fibre optic connections – 2 per relay.
(Refer to Section 4 of this manual – Communications Interface).
5 Ancillary equipment
The relay can be interrogated locally or remotely by making connection to the fibre optic terminals on the rear
of the relay. For local interrogation a portable PC with a fibre to RS232 modem (Sigma 4) is required. The PC
must be capable of running Microsoft Windows Ver 3.1 or greater, and it must have a standard RS232 port in
order to drive the modem. For remote communications more specialised equipment is required. Refer to
Section 4 of this manual – Communications Interface.
©2010 Siemens Protection Devices Limited
7SG11 Argus 8 Installation
Chapter 6 Page 4 of 6
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