6 Parameter Settings and Functions 
 
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6.6  Communication settings 
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 transmit data 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   
Standards  EIA RS485-compliant 
Max. Connections  31 units (Addresses: 01 through 99) 
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 Remote Terminal Unit (Character = 11 bit as fixed) 
 
You could modify the parameter (first in, first out) using keys during communication connection, 
but this may lead to errors and malfunctions. 
6.6.1  Unit address settings [PAR4 → ADRS] 
You can assign individual addresses to data units. 
Parameter  Setting range 
Unit 
PAR4  ADRS  01 to 99
01  - 
6.6.2  BPS (bits per second) settings [PAR4 → BPS] 
You can set the rate of data transmission. 
Parameter  Setting range 
Unit 
PAR4
BPS
24(2400 bps) / 48(4800 bps) / 96(9600 
bps) / 192(19200 bps) / 384(38400 bps) 
96  bps