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Hello all, I need to get temperature data from control temperature and I have problem How to use arduino communicate with Temperature control (dixell XR20CX) by Modbus interface



Communication detail

                         modbus                           RS485                                     RS232
control temp   -----------------> XJ485-CX ----------------> Interface to RS232 ------------> Arduino
(dixell XR20CX)     


Information
1. dixell XR20CX use Modbus RTU     http://www.ecd.com.pl/Dokumenty/EN%202009/XR20CX_GB.pdf
2. I can use dixell XR20CX interface to PC by Modbus32 software and got temperature
   Device ID :1     Address: 257   Range:1    type Holding Register (type I'm not sure) 
   RS232 baudrate 9600 Length 8 Parity NONE Stop bit: 1

3. I think should use example from http://sites.google.com/site/jpmzometa/arduino-mbrt/examples
  I need help modify code for get data address 257 rage1 only

Thank you.