User's Manual

Date Code 20091009 SEL-3031 Instruction Manual
Job Done Examples
High-Speed Teleprotection or Control With M
IRRORED BITS Communications
3.5
SEL-2505 and SEL-2506 Settings
The SEL-2505 and SEL-2506 use control (DIP) switches to set the MIRRORED BITS
connection. For easy installation order the SEL-2505 with the SEL-2812 fiber-optic
option (SEL-2505x6xXX). Use multimode C807 ST terminated fiber-optic cable to
directly connect the SEL-2505 to an SEL-3031 equipped with a fiber-optic option for
Port 1. Other transceiver models can be used as long as the corresponding SEL-2800
family transceiver is used on both ends.
Figure 3.5 SEL-2505 DIP Switch Settings for MIRRORED BITS Connection
Set the TX_ADD equal to one and set RX_ADD equal to two at the local end. At the
remote end, set the RXID equal to two and the TXID equal to one. The devices use
these addresses so that the master relay only receives messages sent by a relay with the
matching transmit address and vice versa.
Set Switch 9 and 10 equal to MB8/19200 for the Protocol/Baud setting. If the
SEL-3031 contains the SEL-3044 Encryption Card then the Protocol/Baud setting
must be MB8/9600.
NOTE: If you are using the SEL-3044 Encryption Card, you
must change the settings of the SEL-2505 output contact
mode dip switches to “SECURE” to maintain the same
level of channel security as the standard MB8 protocol.
This will delay operation by one processing interval but
will give you a higher level of channel security.
To connect the SEL-2505 to the radio, use a 62.5 µm multimode SEL-C807 fiber cable.
The SEL-C807 fiber cable comes with ST
®
connectors and your choice of zipcord or
waterproof heavy-duty jacketed fibers.