Group Jumper connection Description Notes
X7
1-2 B- bias enabled
COM2
4-wire RX channel
2-3
B- bias disabled
1)
X8
1-2 A+ bias enabled
2-3
A+ bias disabled
1)
X9
1-2 Bus termination
enabled
2-3 Bus termination
disabled
1)
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 4-wire mode
10 COM1 A/+ COM2 Rx/+
9 B/- Rx/-
8 COM2 A/+ Tx/+
7 B/- Tx/-
6 AGND (isolated ground)
5 IRIG-B +
4 IRIG-B -
3 -
2 GNDC (case via capacitor)
1 GND (case)
1YHT530004D05 D Section 13
IED physical connections
615 series 857
Technical Manual
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