USB232U/485Ui
4.2.3.3 RS422/485 Multi-drop Applications.....................................................................................16
4.2.3.4 RS422/485 Bus Termination...............................................................................................17
4.2.3.5 RS422/485 Data Rates and Cable lengths ..........................................................................18
4.2.3.6 Cabling of RS422/485 Bus..................................................................................................18
4.2.4 USB Application Notes .......................................................................................................18
4.2.4.1 Data Rates and Flow Control for USB to RS232 .................................................................18
4.3 Testing and Troubleshooting...............................................................................................19
4.3.1 Testing with the Application Software .................................................................................19
4.3.2 The Loop Back Connections...............................................................................................20
4.3.3 Loop-back Testing Using A Terminal Emulator ...................................................................20
5 PROGRAMMING................................................................................................................22
5.1 Programming with Windows 98, 2000 and XP Device drivers. ............................................22
5.2 Half Duplex Transmission Turnaround................................................................................22
APPENDIX A - TECHNICAL SPECIFICATIONS................................................................................. I
A.1 HARDWARE SPECIFICATION..............................................................................................i
A.1.1 USB.......................................................................................................................................i
A.1.1.1 Series B connector ................................................................................................................i
A.1.2 USB232U RS232 Port ..........................................................................................................ii
A.1.2.1 9-way Connector...................................................................................................................ii
A.1.2.2 Data Rate .............................................................................................................................ii
A.1.2.3 I/O Protection .......................................................................................................................ii
A.1.2.4 ESD Protection.....................................................................................................................ii
A.1.3 USB485Ui RS422/485 Port.................................................................................................. iii
A.1.3.1 9-way Connector.................................................................................................................. iii
A.1.3.2 Data Rate ............................................................................................................................ iii
A.1.3.3 Rx I/P Termination .............................................................................................................. iii
A.1.3.4 Tx O/P Protection................................................................................................................ iii
A.1.3.5 I/O Isolation......................................................................................................................... iii
A.1.3.6 ESD Protection.................................................................................................................... iii
A.1.3.7 Modes ................................................................................................................................. iii
A.1.3.8 Transmit Turnaround ........................................................................................................... iii
A.1.4 UART ..................................................................................................................................iv
A.1.4.1 Baud Rates..........................................................................................................................iv
A.1.4.2 Data Bits..............................................................................................................................iv
A.1.4.3 Stop Bits..............................................................................................................................iv
A.1.4.4 Parity...................................................................................................................................iv
A.1.5 PC INTERFACE ..................................................................................................................iv
A.1.5.1 Compatibility .......................................................................................................................iv
A.1.5.2 Host resources.....................................................................................................................iv
A.1.5.3 USB Frame Rate .................................................................................................................iv
A.1.5.4 USB packet size ..................................................................................................................iv
A.2 SOFTWARE ........................................................................................................................iv
A.3 ENVIRONMENTAL CONDITIONS........................................................................................v
A.3.1 Specific conditions................................................................................................................v
A.3.1.1 Dimensions...........................................................................................................................v
A.3.1.2 Temperature Range..............................................................................................................v
A.3.1.3 Power Requirements ............................................................................................................v
A.3.1.4 Dissipation............................................................................................................................v
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