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Table 961:
EIA-232 and EIA-485 jumper connectors for COM1
Group
Jumper connection
Description
X19
1-2
2-3
EIA-485
EIA-232
X20
1-2
2-3
EIA-485
EIA-232
X21
1-2
2-3
EIA-485
EIA-232
X26
1-2
2-3
EIA-485
EIA-232
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 and X9 to enabled
position. The bus termination is selected by setting jumpers X7 and X11 to enabled
position.
The jumpers have been set to no termination and no biasing as default.
Table 962:
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 963:
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)
Table continues on next page
1MAC059074-MB A
Section 13
Protection relay's physical connections
615 series ANSI
1157
Technical Manual
Содержание Relion 615 series
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