
IM 01R04B08-00E-E 1st edition February 15, 2012 -00
All Rights Reserved. Copyright © 2012, Rota Yokogawa
<9. MODBUS COMMUNICATION TOOL>
9-1
9. MODBUS COMMUNICATION TOOL
9.1 Preconditions
TheModbusCommunicationToolwasdesignedtosupporttheparametersandvaluesoftheROTAMASS3
SeriesModbuscommunicationtypewhichareavailableviaModbus.
TheModbusCommunicationToolsupportsthesamecommunicationsettingsasROTAMASS.
Baud rates: 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200
Dataformats: 8E1,8O1,8N2,8N1
Modbusmodes:RTU,ASCII
The Modbus Communication Tool was successfully tested on the following operating systems:
Win XP 32bit, Win 7 32bit, Win 7 64bit
TheModbusCommunicationToolusesthe.NET2.0FrameworkfromMicrosoft.Theinstallerwillcheckthe
availabilityof.NET2.0andaskyouforinstallationifnecessary.
TheModbusCommunicationToolisprovidedona“ASIS”basis.AlthoughitmightworkonotherWindows
versionsandwithotherModbusdevicesthiswasnottestedandRotaYokogawadoesnotprovideanyliability,
warranty or support for its use.
9.2 Installation and start
For installation of the Modbus Communication Tool run either the .msi le or execute setup.exe which will
bothbeavailablefromYokogawa.ModbusCommunicationToolisa32bitapplicationandwillbeinstalled
in the "Program Files (x86)" directory by default. For most users there is no need to change the path. To
complete the installation conrm all messages.
Dependingontheversionoftheoperatingsystemand/orsettingssomeusersmightnothaveenough
privilegestoinstallModbusCommunicationTool.Ifyouencounteranyproblemsorerrormessagesduring
installation please contact your system administrator.
Aftersuccessfulinstallationanentry"Yokogawa"willbecreatedinyourstartmenuandaniconwillbeplaced
on your desktop. To start Modbus Communication Tool simply double-click the entry in the start menu or on
the desktop icon.
9.3 Using the Modbus Communication Tool
AfterstartingModbusCommunicationToolapop-upwindowwithlogoanddisclaimerwillappearatrst.
Please read carefully. Only after conrmation the application will continue.
Therstitemstobeshownarethecommunicationsettings.Herethedeviceaddress,COMportofthe
computer, baud rate, data format and Modbus mode can be adjusted.
Note:ThedefaultsettingsofROTAMASSaredeviceaddress1,19200baud,dataformat8E1,ModbusRTU.
MakesurethatallcommunicationsettingsofthecomputerandtheconnectedROTAMASSmatch.To
establishaconnectioncheckalsoproperwiringofthelinesA(D-)andB(D+)betweenyourRS485
interfaceandROTAMASS.
AfteropeningtheCOMportbypressingthebutton"OpenSerial"theconnectionwillbetestedrstandthe
result will be indicated in the status line of the window.
Troubleshooting:
If any other status than "OK" is indicated please check the items below at rst:
Status Description Possible countermeasures
Reply time-out There is no connection at all
orROTAMASSwasnotable
to understand the request
a) CheckifcommunicationsettingsinROTAMASS
and Modbus Communication Tool match
b) Check wiring: polarity, line termination, power
supply
Checksum error Communication is disturbed a) Check communication settings: namely number
of data bits, parity, number of stop bits
b) Check cable connections
c) Check if other members are on the bus and
disconnect them if possible
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