Hi, Niksa: ICP DAS embedded PLCs with Modbus firmware are programmable slave I/O units with Modbus protocol and suit master-slave or query-response distributed I/O applications. The controllers are pre-installed Modbus firmware, therefore the PC, HMI or PLC can use Modbus/TCP and Modbus/RTU protocol to communicate with I/O modules in the unit via the RS-232/485 or Ethernet interface. Besides the slave I/O functionality, it is also a C language based programmable controller for stand-alone applications. The SDK which ICP DAS provides, allow the customization of rich functions for Modbus communication, such as Modbus/TCP master/slave, Modbus/RTU master/salve, Modbus/ASCII master, etc. You can find out more at http://www.icpdas-usa.com/i_8431_mtcp.html I hope this is what you were looking for! Cordially, Ms. Vimaris Grau www.icpdas-usa.com
