iv UDA2182 Communications User Guide January 09
Contents
1. INTRODUCTION................................................................................................... 1
1.1 Overview ........................................................................................................................................ 1
1.2 Specifications .................................................................................................................................2
2. COMMUNICATION CARD WIRING...................................................................... 3
2.1 Overview ........................................................................................................................................ 3
2.2 Ethernet Port Wiring ......................................................................................................................3
2.3 Serial Port Wiring........................................................................................................................... 4
3. UDA COMMUNICATIONS SETUP ....................................................................... 5
3.1 UDA Ethernet Communications Setup...........................................................................................5
3.1.1 Overview .............................................................................................................................5
3.1.2 Setting up a Static IP Address using the Front Panel ..........................................................6
3.1.3 Setting up DHCP using the front-panel...............................................................................8
3.2 UDA Serial Communications Setup...............................................................................................9
4. MODBUS RTU SERIAL COMMUNICATION PORT ........................................... 10
4.1 Overview ...................................................................................................................................... 10
4.2 Modbus RTU Message Format ....................................................................................................10
4.3 Modbus RTU Link Layer.............................................................................................................11
4.4 General Modbus RTU message format ........................................................................................ 11
4.5 Modbus RTU Data Layer.............................................................................................................11
5. MODBUS/TCP INTERFACE............................................................................... 12
5.1 Introduction .................................................................................................................................. 12
5.2 Modbus/TCP Protocol..................................................................................................................12
5.3 Parameter Addressing...................................................................................................................12
6. IEEE 32-BIT FLOATING POINT REGISTER INFORMATION............................ 13
6.1 IEEE Floating Point Data Format.................................................................................................13
7. MODBUS DOUBLE REGISTER FORMAT......................................................... 16
7.1 Overview ...................................................................................................................................... 16
7.2 IEEE Floating Point Formats........................................................................................................17
7.3 Unsigned/signed 32-bit Register Formats .................................................................................... 18
7.4 Setting Up the Modbus Double Register Format ......................................................................... 19
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