ABB RED615 Technical Manual page 862

Section 13
IED physical connections
856
Table 670: 2-wire EIA-485 jumper connectors
Group Jumper connection
X4 1-2
2-3
X5 1-2
2-3
X6 1-2
2-3
X7 1-2
2-3
X8 1-2
2-3
X9 1-2
2-3
The bus is to be biased at one end to ensure fail-safe operation, which can be done
using the pull-up and pull-down resistors on the communication module. In 4-wire
connection the pull-up and pull-down resistors are selected by setting jumpers X4,
X5, X7 and X8 to enabled position. The bus termination is selected by setting
jumpers X6 and X9 to enabled position.
The jumpers have been set to no termination and no biasing as default.
Table 671: 4-wire EIA-485 jumper connectors for COM2
Group Jumper connection
1-2
X4
2-3
1-2
X5
2-3
1-2
X6
2-3
Table continues on next page
Description Notes
A+ bias enabled COM2
2-wire connection
A+ bias disabled
B- bias enabled
B- bias disabled
Bus termination
enabled
Bus termination
disabled
B- bias enabled COM1
2-wire connection
B- bias disabled
A+ bias enabled
A+ bias disabled
Bus termination
enabled
Bus termination
disabled
Description Notes
A+ bias enabled
A+ bias disabled 1)
B- bias enabled
COM2
1)
B- bias disabled
4-wire TX channel
Bus termination
enabled
Bus termination
1)
disabled
1YHT530004D05 D
615 series
Technical Manual