ABB Relion REC615 - Page 847

Table 743: COM2 serial connection X5 EIA-485/ X12 Optical ST
Group Jumper connection Description
X27 1-2
2-3
EIA-485
Optical ST
X28 1-2
2-3
EIA-485
Optical ST
Table 744: 2-wire EIA-485 jumper connectors for COM2
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
Table 745: 4-wire EIA-485 jumper connectors for COM2
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
1MRS758755 C Protection relay's physical connections
REC615 & RER615
Technical Manual
847