ABB RER620 Technical Manual page 566

Section 12
Relay physical connections
560
Table 436: COM2 serial connection X5 EIA-485/ X12 Optical ST
Group
X27
X28
Table 437: 2-wire EIA-485 jumper connectors for COM2
Group
X13
X14
X15
Table 438: 2-wire EIA-485 jumper connectors for COM2
Group Jumper connection
X13 1-2
2-3
X14 1-2
2-3
X15 1-2
2-3
X17 1-2
2-3
X18 1-2
2-3
X19 1-2
2-3
Table 439: X12 Optical ST connection
Group
X3
X24
Jumper connection
1-2
2-3
1-2
2-3
Jumper connection
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
A+ bias enabled
A+ bias disabled
B- bias enabled
B- bias disabled
Bus termination enabled
Bus termination disabled
Jumper connection
1-2
2-3
1-2
2-3
1MAC309294-MB F
Description
EIA-485
Optical ST
EIA-485
Optical ST
Description
A+ bias enabled
A+ bias disabled
B- bias enabled
B- bias disabled
Bus termination enabled
Bus termination disabled
Notes
COM2
4-wire TX channel
4-wire RX channel
Description
Star topology
Loop topology
Idle state = Light on
Idle state = Light off
RER620
Technical Manual