ABB RER620 Technical Manual page 565

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