
*NOTE: In “422” mode, the ECHO setting is not used.
*The Echo mode is useful for detecting if there is data collision occurring on 
DB9 Pin Assignment
DB9 Pin | 
 | 
 | 
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  | 
  | 
1  | TxD -  | Data +  | 
  | 
  | 
  | 
2  | TxD +  | Data -  | 
  | 
  | 
  | 
3  | RxD +  | NC  | 
  | 
  | 
  | 
4  | RxD -  | NC  | 
  | 
  | 
  | 
5  | GND  | GND  | 
  | 
  | 
  | 
6  | NC  | NC  | 
  | 
  | 
  | 
7  | NC  | NC  | 
  | 
  | 
  | 
8  | NC  | NC  | 
  | 
  | 
  | 
9  | NC  | NC  | 
  | 
  | 
  | 
4