40 GE INFORMATION D400 SUBSTATION GATEWAY INSTRUCTION MANUAL
CHAPTER 3: SETTING UP COMMUNICATION CARDS
RS-485 adapter
The RS-485 Adapter (GE Item No. 520-0208LF) 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. TB1 is a 10 position pluggable 5.08 mm pitch connector,
Molex P/N 39530-0010 (GE Item No. 640-0955).
See “RS-485 connections” on page 58 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 RS-422 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 2-wire on each channel and without RS-422 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.
Table 9: RS-485 Card Switch SW1/SW2 Settings
Channel Option SW1/SW2 Switch Positions
12
2-Wire (default) ON OFF
4-Wire OFF ON
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