7SG12 DAD N Installation
©2010 Siemens Protection Devices Limited Chapter 6 Page 4 of 4
• Nut M4
2103F11040 – 4 off
4.3 Communications
9mm ST fibre optic connections rear port connections and RS232 front port connection. (Refer to section
4 – 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 or the RS232 port on the relay fascia. For local interrogation a portable PC is required. The PC
must be capable of running Microsoft Windows Ver 3.1 or greater, and it must have a standard RS232 port. A
standard data cable is required to connect from the PC to the 25 pin female D type connector on the front of
the relay. For remote communications more specialised equipment is required. See the section on
Communications for further information, and also see Report No. 690/0/01 on Relay Communications.
6 Precautions
When running fibre optic cable, the bending radius must not be more than 50mm.
If the fibre optic cables are anchored using cable ties, these ties must be hand tightened – under no
circumstances should cable tie tension tools or cable tie pliers be used.
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