USB232U/485Ui
LIST OF CONTENTS
PARA SUBJECT PAGE
1 INTRODUCTION ..................................................................................................................1
1.1 The Products Described in this Manual .................................................................................1
1.2 Features of the USB232U/485Ui Series of Data Communications Interfaces ........................1
1.3 General Description ..............................................................................................................2
1.3.1 Enhanced Features...............................................................................................................3
1.4 What the Package Contains..................................................................................................3
1.4.1 The Amplicon Warranty Covering the USB232U/485Ui interfaces.........................................3
1.4.2 Contacting Amplicon Liveline Limited for Technical Support or Service ................................3
1.4.3 Technical Support.................................................................................................................4
1.4.4 Repairs .................................................................................................................................4
2 GETTING STARTED ............................................................................................................6
2.1 General Information..............................................................................................................6
2.2 Installing the Interface ..........................................................................................................6
2.2.1 Windows 98 Installation ........................................................................................................6
2.2.2 Windows 2000/XP Installation...............................................................................................6
2.2.3 Linux Installation...................................................................................................................6
2.3 USB232U/485Ui Configuration Jumper Settings ...................................................................7
2.3.1 RS485 Full Duplex / Half Duplex Operation..........................................................................7
2.3.1.1 Jumper Selection For Full Duplex Operation ........................................................................7
2.3.1.2 Jumper Selection For Half Duplex Operation with Echo........................................................7
2.3.1.3 Jumper Selection For Half Duplex Operation without Echo...................................................7
2.3.2 Transmission Line Termination.............................................................................................8
2.3.2.1 Termination Resistors for RS422/485 Receivers...................................................................8
2.3.3 Jumper Factory Settings Summary.......................................................................................8
2.4 Application Software.............................................................................................................9
2.4.1 Installation Testing................................................................................................................9
3 MAKING THE CONNECTIONS ..........................................................................................10
3.1 External Connections..........................................................................................................10
3.1.1 USB Connector...................................................................................................................10
3.1.2 RS232 9-way Port...............................................................................................................10
3.1.3 RS422/485 9-way Port........................................................................................................11
3.2 Connector Wiring for RS422/485 Full/Half Duplex ..............................................................11
3.3 The Ground Connections....................................................................................................11
3.3.1 USB232U Ground Connections ..........................................................................................11
3.3.2 USB485Ui Ground Connections..........................................................................................12
3.4 Choice of Cable..................................................................................................................12
4 USING THE SERIAL COMMUNICATIONS DEVICES.........................................................13
4.1 Why Isolate? ......................................................................................................................13
4.2 Application Notes................................................................................................................14
4.2.1 Applicable Standards..........................................................................................................14
4.2.1.1 RS Standards .....................................................................................................................14
4.2.2 RS232 Application Notes....................................................................................................14
4.2.2.1 RS232 Electrical Levels......................................................................................................15
4.2.2.2 RS232 Data Rates and Cable lengths.................................................................................15
4.2.2.3 RS232 Cable Adapters .......................................................................................................15
4.2.3 RS422/485 Application Notes .............................................................................................15
4.2.3.1 RS422/485 Parameters ......................................................................................................16
4.2.3.2 RS422/485 Signalling Sense ..............................................................................................16
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