Table 682: EIA-485 connections for COM0023 (X6)
Pin 2-wire mode 4-wire mode
1 - Rx/+
6 - Rx/-
7 B/- Tx/-
8 A/+ Tx/+
Table 683: EIA-485 connections for COM0023 (X5)
Pin 2-wire mode 4-wire mode
9 - Rx/+
8 - Rx/-
7 A/+ Tx/+
6 B/- Tx/-
5 AGND (isolated ground)
4 IRIG-B +
3 IRIG-B -
2 -
1 GND (case)
13.3.8.3 COM0008 and COM0010 jumper locations and connections
The EIA-485 communication module follows the TIA/EIA-485 standard and is
intended to be used in a daisy-chain bus wiring scheme with 2-wire or 4-wire, half-
duplex, multi-point communication. Serial communication can be also used
through optical connection which is used either in loop or star topology.
Two parallel 2-wire serial communication channels can be used at the same time.
Also optical serial connector can be used in parallel with one 2-wire or 4-wire
serial channel.
The maximum number of devices (nodes) connected to the bus
where the IED is being used is 32, and the maximum length of the
bus is 1200 meters.
1YHT530004D05 D Section 13
IED physical connections
615 series 863
Technical Manual
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