
IM 01R04B08-00E-E 1st edition February 15, 2012 -00
All Rights Reserved. Copyright © 2012, Rota Yokogawa
<4. GETTING STARTED>
4-2
4.2 Communication Setting
ToactivateMODBUS,thefollowingsettingsarerequired.TheyarelocatedintheMODBUSCommunication
menu in Detailed Setup.
Donotturnoffthepowersupplyimmediatelyaftersetting.WhentheparametersaresavedtotheEEPROM,
theredundantprocessingisexecutedfortheimprovementofreliability.Ifthepoweristurnedoffwithin60
secondsaftersettingismade,themodiedparametersarenotsavedandthesettingsmayreturntothe
previousvalues.
Table 4.1 Communication Parameters
Function Parameter Description and Setting
Deviceaddress Deviceaddress Select: 1 to 247
SetthedeviceaddressforROTAMASSwherethe
host expects to communicate. Make sure that no other
deviceonthebususesthesameaddress!
Baud rate Baud rate Select: 1200, 2400, 4800, 9600, 19200, 38400, 57600,
76800, 115200
MakesurethathostandROTAMASSusethesame
baud rate for communication
Communication
settings
Data format Select: Even 1 stop bit,Odd1stopbit,None1stop
bit,None2stopbits
MakesurethathostandROTAMASSusethesame
communication settings.
Bus mode Modbus mode Select: RTU,ASCII
MakesurethathostandROTAMASScommunicatein
the same Modbus mode.
Modbus init
The MODBUS communication module must be
restartedafterchanginganyoftheabovesettings!
This can be done by either powering off and on the
deviceorbyexecutingthefunction“Modbusinit”.
Please note that the settings in the menu will
beupdatedafterinitializationoftheModbus
communication module.
ConnectingtheROTAMASSMODBUScommunicationtooltoabuswithitsexistinghostmaycause
communication data scrambles resulting in a functional disorder or a system failure.
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