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To ensure fail-safe operation, the bus is to be biased at one end using the pull-up and
pull-down resistors on the communication module. In the 4-wire connection, the pull-
up and pull-down resistors are selected by setting jumpers X5, X6, X8, X9 to enabled
position. The bus termination is selected by setting jumpers X7, X11 to enabled
position.
The jumpers have been set to no termination and no biasing as default.
Table 721:
2-wire EIA-485 jumper connectors for COM1
Group
Jumper connection
Description
Notes
X5
1-2
2-3
A+ bias enabled
A+ bias disabled
1)
COM1
Rear connector X6
2-wire connection
X6
1-2
2-3
B- bias enabled
B- bias disabled
1)
X7
1-2
2-3
Bus termination
enabled
Bus termination
disabled
1)
1) Default setting
Table 722:
4-wire EIA-485 jumper connectors for COM1
Group
Jumper connection
Description
Notes
X5
1-2
2-3
A+ bias enabled
A+ bias disabled
1)
COM1
Rear connector X6
4-wire TX channel
X6
1-2
2-3
B- bias enabled
B- bias disabled
1)
X7
1-2
2-3
Bus termination
enabled
Bus termination
disabled
1)
X9
1-2
2-3
A+ bias enabled
A+ bias disabled
1)
4-wire RX channel
X8
1-2
2-3
B- bias enabled
B- bias disabled
1)
X11
1-2
2-3
Bus termination
enabled
Bus termination
disabled
1)
1) Default setting
COM2 port connection can be either EIA-485 or optical ST. Connection type is
selected by setting jumpers X27 and X28.
Table 723:
COM2 serial connection X5 EIA-485/ X12 Optical ST
Group
Jumper connection
Description
X27
1-2
2-3
EIA-485
Optical ST
X28
1-2
2-3
EIA-485
Optical ST
Section 13
1MRS758755 A
Protection relay's physical connections
776
REC615 and RER615
Technical Manual
Содержание RELION Series
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