Amplicon USB232U Instruction Manual
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Amplicon USB232U Instruction Manual

Usb to rs232/rs485 serial communications interface with isolation option
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USB232U/485Ui
USB232U/485Ui
USB TO RS232 / RS485
SERIAL
COMMUNICATIONS
INTERFACE
W ITH ISOLATION
OPTION
This Instruction Manual is supplied with the USB232U/485Ui Adapter to provide the user with sufficient information to
utilise the purchased product in a proper and efficient manner. The information contained has been reviewed and is
believed to be accurate and reliable, however Amplicon Liveline Limited accepts no responsibility for any problems
caused by errors or omissions. Specifications and instructions are subject to change without notice.
Instruction Manual Issue A2
USB232U/485Ui
© Amplicon Liveline Limited
Prepared by Helen Elcock
See
www.amplicon.co.uk
for updates

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Summary of Contents for Amplicon USB232U

  • Page 1 W ITH ISOLATION OPTION This Instruction Manual is supplied with the USB232U/485Ui Adapter to provide the user with sufficient information to utilise the purchased product in a proper and efficient manner. The information contained has been reviewed and is believed to be accurate and reliable, however Amplicon Liveline Limited accepts no responsibility for any problems caused by errors or omissions.
  • Page 2 USB232U/485Ui DECLARATION OF CONFORMITY MEV LIMITED SUITE 8, BAXALL BUSINESS CENTRE ADSWOOD ROAD STOCKPORT SK3 8LF UK We declare that the product(s) described in this Instruction Manual perform in conformity with the following standards or standardisation documents: Electro Magnetic Compatibility (EMC):...

  • Page 3: Table Of Contents

    LIST OF CONTENTS PARA SUBJECT PAGE INTRODUCTION ........................1 The Products Described in this Manual .................1 Features of the USB232U/485Ui Series of Data Communications Interfaces ......1 General Description ......................2 1.3.1 Enhanced Features.......................3 What the Package Contains....................3 1.4.1 The Amplicon Warranty Covering the USB232U/485Ui interfaces.........3 1.4.2...
  • Page 4 Half Duplex Transmission Turnaround................22 APPENDIX A - TECHNICAL SPECIFICATIONS................. I 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........................
  • Page 5 Figure 2.5 Factory Jumper Setting Summary..................8 Figure 3.1 USB Connector Termination Assignment .................10 Figure 3.2 RS232 9-way Port Pin Designations.................11 Figure 3.3 RS422/485 Amplicon Standard Port Pin Designations............11 Figure 4.1 Communications Standards Summary ................16 Figure 4.2 RS422 Connected in Broadcast Mode................17 Figure 4.3 RS485 Connected in Multi-Drop, Half Duplex Mode ............17...

  • Page 7: Introduction

    USB485Ui An isolated RS485 interface. Features of the USB232U/485Ui Series of Data Communications Interfaces Each of the USB232U/485Ui series of interfaces is designed to meet stringent performance requirements and ease of use while maintaining compatibility with standard serial communications products.

  • Page 8: General Description

    USB232U/485Ui General Description The USB232U and USB485Ui are advanced RS232/RS485 serial communications interfaces suitable for any IBM PC or compatible computer that supports USB 1.1. All models are supported by third party Windows 98, 2000, XP and Linux drivers. Microsoft Windows drivers are distributed on the CD that accompanies this product.

  • Page 9: Enhanced Features

    1.3.1 Enhanced Features The USB232U supports data rates up to 920k Baud. The USB485Ui supports data rates up to 3M Baud. There is a 384 byte receive FIFO buffer and 128 byte transmit FIFO buffer associated with each port. This allows the processor to service the ports in a timely manner over the USB bus.

  • Page 10: Technical Support

    Before returning the goods, please request an individual RMA number by contacting Amplicon Customer Services as detailed above. Please mark the RMA number on the outside of the packaging to ensure that the package is accepted by the Goods Inwards Department.
  • Page 11 USB232U/485Ui Brighton, East Sussex BN2 4AW England Page 5...

  • Page 12: Getting Started

    GETTING STARTED General Information All of the USB232U/485Ui series are Plug and Play and come complete with all the software to install and operate the device in any USB version 1.1 compliant host PC running under Windows or Linux and allow execution of normal serial communications programs.

  • Page 13: Usb232U/485Ui Configuration Jumper Settings

    USB232U/485Ui USB232U/485Ui Configuration Jumper Settings Most configuration settings on the USB485Ui are performed by the plug and play installation program. However the USB485Ui has some jumpers and these need to be set before connecting the unit to the host. The functions of the jumpers on the USB485Ui control whether the unit operates in Full Duplex or Half Duplex mode and whether or not the RS485 port is terminated.

  • Page 14: Transmission Line Termination

    USB232U/485Ui 2.3.2 Transmission Line Termination 2.3.2.1 Termination Resistors for RS422/485 Receivers Operation of RS422/485 systems requires that the data lines be terminated at the final receiver. The simplest termination is by a line-to-line resistor, and provision is made to connect this 120Ω...

  • Page 15: Application Software

    USB232U/485Ui Application Software The ‘HyperTerminal’ program supplied with Windows is compatible with the USB232U/485Ui interfaces and is useful for testing and operation on COM1 to COM4 channels. The software supplied with this device supports operation with Windows 98, ME, 2000, and XP.

  • Page 16: Making The Connections

    USB232U/485Ui MAKING THE CONNECTIONS This chapter describes the signal and control connections that the user must make between the USB232U/485Ui interfaces and any external serial communications devices. External Connections 3.1.1 USB Connector Connection to the USB port is made using a standard type B cable.

  • Page 17: Rs422/485 9-Way Port

    Provision is made for securing by screw jacks. The 9-way D-type connector pin-out compatible with the default pin-out of the Amplicon PCI248H(i)/PCI249H(i) series boards. Transmitted Data - B...

  • Page 18: Usb485Ui Ground Connections

    As speeds and distances of communication increase the choice of cable over which the communication is to take place becomes critical. Amplicon recommend Belden Cable, part no. 8132 for use in long distance high speed RS422 & RS485 networks. This is multi-shielded twisted pair cable. It has a capacitance of 20pF/m and characteristic impedance of 120 ohms.

  • Page 19: Using The Serial Communications Devices

    USB232U/485Ui USING THE SERIAL COMMUNICATIONS DEVICES Why Isolate? The USB485Ui provides complete electrical isolation between any signals connected to a serial port, signals connected to the other port and the circuits of the host computer. In a compact office or laboratory environment such isolation may not be necessary, however in a wide-field industrial situation, serial digital communication can be disrupted by many types of contaminating signals, most of which can be eliminated by the proper use of isolation.

  • Page 20: Application Notes

    The prefix 'RS' signifies Recommended Standard, and the three interface types, RS232, RS422 and RS485, supported by the Amplicon range of devices are all well defined in the appropriate standards publications. The functions and features of the data and control interfaces presented by the USB232U/485Ui series generally conform to normal industry practice employing a subset of the full standards.

  • Page 21: Rs232 Electrical Levels

    The levels are specified relative to signal ground at 0 volts, (the remote device signal ground in the case of isolated ports), and the region between –3 and +3 volts is the transition region. The voltage levels transmitted by the USB232U data and control lines are about ±10 V. 4.2.2.2...

  • Page 22: Rs422/485 Parameters

    USB232U/485Ui 4.2.3.1 RS422/485 Parameters The following table summarises the principal parameters of the RS422B and RS485 standards, and shows RS232E for comparison. The actual driver/receiver devices used in the USB485Ui Series at least meet these specifications, and provide superior performance in some cases.

  • Page 23: Rs422/485 Bus Termination

    USB232U/485Ui Rx - A Terminator Rx - B Rx Resistor Tx - A Tx - B A' B' A' B' A' B' USB485Ui RS422 Port Terminator Rx Resistor Device 2 Device 1 Device n Figure 4.2 RS422 Connected in Broadcast Mode RS485 allows multiple (up to 32) unit loads to be connected in half duplex on a single twisted wire pair for 'party line' type of communications as illustrated in Figure 4.3.

  • Page 24: Rs422/485 Data Rates And Cable Lengths

    USB232U/485Ui In a multi-drop system, the terminator resistor is only required at the device receiver located at the far end of the cable. If this is in half duplex operation, then both ends of the bus cable are equipped with receivers (transceivers) so termination is necessary at both ends. RS485 transmitter circuits are capable of driving a minimum load resistance of 60 Ω, so no more than...

  • Page 25: Testing And Troubleshooting

    (a) a packet shorter than 64 bytes is received or (b) the requested data length is reached. The performance of the USB232U/485Ui ports is therefore not exactly equivalent to that of legacy ports. For more information see the application note AN232-04...

  • Page 26: The Loop Back Connections

    4.3.2 The Loop Back Connections The USB232U/485Ui can be separated from external serial interface influences such as the signal cables, other devices and the applications program by performing a loop-back test. For both RS232 and RS422/485 tests, it is necessary to make up a wrap connector using a 9-way D-type free socket that mates with the port under test.
  • Page 27 USB232U/485Ui At the 'Connect to' dialogue box, select 'Direct to COM n', where 'n' is the number of the COM port using the list box 'Connect using'. Then click 'OK'. Modify the port settings to your requirement if required, then click 'OK'. This will bring you to the main window and flashing cursor.

  • Page 28: Programming

    USB232U/485Ui PROGRAMMING The USB232U/485Ui interfaces are supplied with Windows 98, 2000, XP and Linux specific drivers. Programming for use under other operating systems is beyond the scope of this manual. Programming with Windows 98, 2000 and XP Device drivers. Application programmers writing programs to run under these operating systems will simply treat the port as a standard COM port.

  • Page 29: Appendix A - Technical Specifications

    USB232U/485Ui Appendix A - TECHNICAL SPECIFICATIONS Figures given in the specification are typical at 25° C, except where otherwise stated. HARDWARE SPECIFICATION There are three interfaces available in the range: USB232U Communications RS232 I/O Connector 9-way male D-type with fixing screws...

  • Page 30: Usb232U Rs232 Port

    A.1.2.1 9-way Connector 9-way, male D-type connector with metal shell. Pinouts to IBM input/output standard. The connector shell is connected to the local PC chassis ground. USB232U port is configured as Data Terminal Equipment (DTE) A.1.2.2 Data Rate The port is capable of error free transmission at data rates up to 1 M Baud.

  • Page 31: Data Rate

    USB232U/485Ui A.1.3 USB485Ui RS422/485 Port A.1.3.1 9-way Connector 9-way, male D-type connector with metal shell. For the isolated versions, all signals are referred to the remote device signal ground. A.1.3.2 Data Rate The port is capable of error free transmission at data rates up to 3 M Baud.

  • Page 32: Uart

    USB232U/485Ui A.1.4 UART One FDTI FT8U232BM USB UltraBaud Data Transfer IC. A.1.4.1 Baud Rates All rates from 184 baud to 1.33 Mbaud (+/-3%) and the following specific rates can be generated depending on device. 1.411765 MBaud 1.500000 MBaud 1.600000 MBaud 1.714286 MBaud...

  • Page 33: Environmental Conditions

    USB232U/485Ui ENVIRONMENTAL CONDITIONS A.3.1 Specific conditions A.3.1.1 Dimensions Length 87 mm plus edge connectors. Width 43 mm Height 26 mm A.3.1.2 Temperature Range Operating 0° C to +50° C Storage –20 to +60° C A.3.1.3 Power Requirements +5 VDC from USB. Current required is less than one load unit, <...

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