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 as 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 687: EIA-485 connections for COM0008 and COM0010
Pin 2-wire mode 4-wire mode
9 COM1 A/+ COM2 Rx/+
8 B/- Rx/-
7 COM2 A/+ Tx/+
6 B/- Tx/-
5 AGND (isolated ground)
4 IRIG-B +
3 IRIG-B -
2 GNDC (case via capasitor)
1 GND (case)
13.3.8.4 COM0032-COM0034 jumper locations and connections
The optional communication modules include support for optical ST serial
communication (X9 connector). The fibre-optic ST connection uses the COM1 port.
Section 13 1YHT530004D05 D
IED physical connections
866 615 series
Technical Manual
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