ABB RELION 620 Series Technical Manual page 907

1MAC504801-IB E
620 series ANSI
Technical Manual
Table 627: EIA-232 and EIA-485 jumper connectors for COM1
Group
X19
X20
X21
X26
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 the enabled
position. The bus termination is selected by setting jumpers X7, X11 to the enabled
position.
The jumpers have been set to no termination and no biasing as default.
Table 628: 2-wire EIA-485 jumper connectors for COM1
Group Jumper connection
X5 1–2
2–3
X6 1–2
2–3
X7 1–2
2–3
1) Default setting
Table 629: 4–wire EIA-485 jumper connectors for COM1
Group Jumper connection
X5 1–2
2–3
X6 1–2
2–3
X7 1–2
2–3
Table continues on next page
Protection relay's physical connections
Jumper connection
1–2
2–3
1–2
2–3
1–2
2–3
1–2
2–3
Description
A+ bias enabled
A+ bias disabled
B- bias enabled
B- bias disabled
Bus termination enabled
Bus termination disabled
Description
A+ bias enabled
A+ bias disabled
B- bias enabled
B- bias disabled
Bus termination enabled
Bus termination disabled
Section 14
Description
EIA-485
EIA-232
EIA-485
EIA-232
EIA-485
EIA-232
EIA-485
EIA-232
Notes
COM1
Rear connector X6
1)
2-wire connection
Notes
COM1
Rear connector X6
1)
4-wire TX channel
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