ABB RED615 Technical Manual page 863

1YHT530004D05 D
615 series
Technical Manual
Group Jumper connection
1-2
X7
2-3
1-2
X8
2-3
1-2
X9
2-3
1) Default setting
It is recommended to enable biasing only at one end of the bus.
Termination is enabled at each end of the bus.
It is recommended to ground the signal directly to earth from one
node and through capacitor from other nodes.
The optional communication modules include support for EIA-485 serial
communication (X5 connector). Depending on the configuration, the
communication modules can host either two 2-wire-ports or one 4-wire-port.
The two 2-wire ports are called COM1 and COM2. Alternatively, if there is only
one 4-wire port configured, the port is called COM2. The fibre-optic ST connection
uses the COM1 port.
Table 672: EIA-485 connections for COM0001-COM0014
Pin 2-wire mode
10 COM1
9
8 COM2
7
6 AGND (isolated ground)
5 IRIG-B +
4 IRIG-B -
3 -
2 GNDC (case via capacitor)
1 GND (case)
IED physical connections
Description
B- bias enabled
1)
B- bias disabled
A+ bias enabled
1)
A+ bias disabled
Bus termination
enabled
Bus termination
1)
disabled
4-wire mode
A/+ COM2
B/-
A/+
B/-
Section 13
Notes
COM2
4-wire RX channel
Rx/+
Rx/-
Tx/+
Tx/-
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