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  Hitachi
This Hitachi IOServer allows the eWON to poll tags belonging to a HITACHI EH series PLC using its serial link or ethernet interface.
eWON uses standard H protocol (for serial RS232), station number H protocol (for serial RS485), and ethernet H-protocol (for ethernet).

The remote maintenance functionality is provided by the VCOM feature of eWON.
 
   
General
Hitachi IOServer (extract from RG-001) Hitachi.pdf  
Hitachi Serial cables KB-0013.pdf