ABB RER620 Technical Manual page 564

Section 12
Relay physical connections
558
Table 432: Configuration options of the two independent communication ports
COM1 connector X6
EIA-232
EIA-485 2-wire
EIA-485 4-wire
Figure 315: Jumper connections on communication module COMB022/023A
COM1 port connection type can be either EIA-232 or EIA-485. Type is selected by setting
jumpers X19, X20, X21, X26.
The jumpers are set to EIA-232 by default.
COM2 connector X5 or X12
Optical ST (X12)
EIA-485 2-wire (X5)
EIA-485 4-wire (X5)
1 2 3
X 13
X 15
X 14
1 2 3
X 3
X 25
X 24
1MAC309294-MB F
RER620
Technical Manual