Revision April 2009     8-1 
Chapter 8  MODBUS Communications 
8.1 Communication Hardware Interface 
The ASDA-A and ASDA-A+ series servo drives have three modes of communication: RS-232, RS-485, and 
RS-422. All aspects of control, operation and monitoring as well as programming of the controller can be 
achieved via communication. However, only one communication mode can be used at a time. Users can 
select the desired communication mode via parameter P3-05.  
Please refer to the following sections for connections and limitations. 
RS-232 
  Configuration 
 
 
Cable Connection 
 
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Call 1(800)985-6929 for Sales