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D400 Substation Data Manager User's Manual  

 

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. 

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. 

The factory default setting is 4-wire on each channel without pull-up/pull-down or line 
termination resistors selected. 

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. 
 

2-Wire  

ON 

OFF 

4-Wire (default) 

OFF 

ON