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GE Energy
D400 Substation Data Manager User's Manual 49
4.4 RS-485 Connections
The D400 accepts connections to RS-485 2-wire and 4-wire type devices through the RS-
485 Adapter. The RS-485 Adapter (GE Part No. 520-0208) plugs into any serial
communication slot (slots 1 through 8) on the D400. It contains two independently
isolated RS-485 channels on a single terminal block: Channel 1 on terminals TB1-1
through TB1-5 and Channel 2 on terminals TB1-6 through TB1-10.
See section “3.4 RS-485 Adapter” for configuration options.
Cabling Requirements
The recommended total maximum length for RS-485 cables is 4000 ft [1300 m] when
operating at 115 kbps. Refer to the manual of the connecting device for its recommended
maximum cable length.
The cables must be shielded and the shield of each RS-485 cable section should be
grounded at one end only. This prevents circulating currents and can reduce surge-
induced current on long communication lines.
2-Wire Connections
» To connect RS-485 2-wire type devices to the RS-485 Adapter, use the
following wiring connection:
Note: Before wiring devices, ensure that the RS-485 Adapter is configured to 2-wire
mode (see section “3.4 RS-485 Adapter”).
Relay
RS485+
RS485-