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GE Energy
D400 Substation Data Manager User's Manual 31
3.4 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 TB1: Channel 1 on terminals TB1-1 through TB1-5 and Channel
2 on terminals TB1-6 through TB1-10.
See section “4.4 RS-485 Connections” for typical cable connections.
Configuration Options
The RS-485 card supports two configuration options on each channel:
• 2-wire
• 4-wire
Pull-up/pull-down and line termination selection is available for the RS-485 signals.
The signal mode for each channel is selectable via two sets of switches on the RS-485
card:
• Channel 1 (TB1-1 to TB1-5) is configured by switches SW2 (top side) and SW4 (bottom
side).
• Channel 2 (TB1-6 to TB1-10) is configured by switches SW1 (top side) and SW3
(bottom side).
Follow instructions for setting the switches to select the appropriate functions for each
channel.
Factory Default
The factory default setting is 4-wire on each channel without pull-up/pull-down or line
termination resistors selected.
Switch SW1/SW2 Configuration
Switches SW1 (for Channel 2 on TB1-6 through TB1-10) and SW2 (for Channel 1 on TB1-1
through TB1-5) control the signal mode for each channel. Each switch contains two
switch positions that can each be set to ON or OFF to select the appropriate channel
option.
RS-485 Card Switch SW1/SW2 Settings
SW1/SW2 Switch Positions
Channel Option
1 2
2-Wire ON OFF
4-Wire (default) OFF ON