25 
 
4.3 Control Circuit 
 
 
  RJ45 port can be connected to the built-in RS-485 communication or option 
communication cards (options cards are under development) 
  Multi-function analog input S1 to S6 can be switched between Sink (NPN) mode and 
Source (PNP) mode. The default setting is NPN mode.   
  DIP switch A1 is used to set the analog input type as voltage or current.   
  AC (Analog Common) is the common terminal of analog signal.   
  Analog output is used to connect a frequency meter, current meter, voltage meter and 
power meter. 
  +V is the input terminal for auxiliary power.