ABB RER620 - Page 566

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