6 Parameter Settings and Functions     
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6.5  Communications 
  This feature is used for external higher systems (PC, GP, etc.) to set the controller's 
parameters and to monitor the controller. It can also be used to external devices. 
  No redundant unit addresses may exist along the same communication line. The 
communication cable must be a twist pair that supports RS485. 
Interface  
Category  Description 
Standards  EIA RS 485-compliant 
Max. Connections  31 (Address: 01 ~ 31) 
Communication  Two-wire, half duplex 
Synchronization  Asynchronous 
Valid Communication 
Distance 
Max. 800 m 
BPS (Bits Per Second)  2400, 4800, 9600, 19200, 38400 bps 
Response Standby  5 ms to 99 ms 
Communication Start Bit  1 bit (fixed) 
Data Bit  8 bit (fixed) 
Communication Parity Bit  None, Even, Odd 
Communication Stop Bit  1, 2 bit 
Protocol  Modbus RTU (character = 11 bit. fixed) 
 
6.5.1  Communication Exchange Number Settings 
  You can assign a unique address to each device. 
  Users can set communication address using both SW1 (communication address 
setting switch) and SW2 (communication group change switch). 
  Setting range: 01 ~ 31 
  Factory default 01