Download HA028014, Issue 4

COMMUNICATIONS MANUAL
COMMUNICATIONS MANUAL
Contents
CHAPTER 1
MODBUS GATEWAY FACILITY .........................................................................1-1
1.1
1.2
1.3
1.4
1.5
1.6
CHAPTER 2
MODBUS DCM ................................................................................................ 2-1
2.1
2.2
2.3
HA028014
Issue 4 May 07
OVERVIEW OF MODBUS GATEWAY FACILITY ........................................................................ 1-1
1.1.1
Main features ................................................................................................................... 1-2
1.1.2
Functional description ...................................................................................................... 1-2
1.1.3
Function codes ................................................................................................................. 1-3
1.1.4
Transparent Modbus Access (TMA or TalkThru) ............................................................. 1-3
PRINCIPLES OF OPERATION ........................................................................................................ 1-4
1.2.1
Operating mode ................................................................................................................ 1-5
1.2.2
Refresh rates and timing information ............................................................................... 1-6
1.2.3
Memory use and requirements ......................................................................................... 1-7
1.2.4
Data conversion ............................................................................................................... 1-8
USING THE DIAGNOSTIC TABLE .............................................................................................. 1-10
1.3.1
Internal diagnostic registers ........................................................................................... 1-10
1.3.2
Modbus table status and control registers ...................................................................... 1-10
1.3.3
Diagnostic table registers ............................................................................................... 1-11
DIAGNOSTIC FUNCTION CODES .............................................................................................. 1-12
MODBUS EXCEPTION RESPONSES .......................................................................................... 1-12
NOTES ON MODBUS IMPLEMENTATION ................................................................................ 1-13
1.6.1
Modbus (AEG-MODICON) implementation ................................................................ 1-13
1.6.2
JBUS implementation .................................................................................................... 1-13
1.6.3
Other product implementations ...................................................................................... 1-13
INTRODUCTION ............................................................................................................................. 2-1
INSTRUMENT CONFIGURATION ................................................................................................. 2-2
2.2.1
Instrument Properties ....................................................................................................... 2-2
2.2.2
Mapping Files .................................................................................................................. 2-2
THE .UYM FILE ............................................................................................................................... 2-3
2.3.1
Scaling ............................................................................................................................. 2-5
2.3.2
Commenting .................................................................................................................... 2-5
Contents
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