ABB RER620 - Page 565

1MAC309294-MB F Section 12
Relay physical connections
RER620 559
Technical Manual
Table 433: EIA-232 and EIA-485 jumper connectors for COM1
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 434: 2-wire EIA-485 jumper connectors for COM1
Table 435: 4–wire EIA-485 jumper connectors for COM1
COM2 port connection can be either EIA-485 or optical ST. Connection type is selected
by setting jumpers X27 and X28.
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
Group Jumper connection Description Notes
X5 1-2
2-3
A+ bias enabled
A+ bias disabled
1
1. Default setting
COM1
Rear connector X6
2-wire connection
X6 1-2
2-3
B- bias enabled
B- bias disabled
X7 1-2
2-3
Bus termination
enabled
Bus termination
disabled
Group Jumper connection Description Notes
X5 1-2
2-3
A+ bias enabled
A+ bias disabled
1
1. Default setting
COM1
Rear connector X6
4-wire TX channel
X6 1-2
2-3
B- bias enabled
B- bias disabled
X7 1-2
2-3
Bus termination enabled
Bus termination disabled
X9 1-2
2-3
A+ bias enabled
A+ bias disabled
4-wire RX channel
X8 1-2
2-3
B- bias enabled
B- bias disabled
X11 1-2
2-3
Bus termination enabled
Bus termination disabled