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Amplicon 485HF9 Instruction Manual

Plug-in signal level adaptor 9 pin rs-232 to rs-422/485
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Model 485HF9
MODEL 485HF9
PLUG-IN
SIGNAL
LEVEL
ADAPTOR
9 PIN RS-232
TO RS-422/485
This Instruction Manual is supplied with the Model 485HF9 Adaptor 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.
Model 485HF9 Instruction Manual Part Nº 859 864 34 Issue A4
© Amplicon Liveline Limited
Prepared by D. Field
Approved for issue by A.S. Gorbold, Operations Director
Page 1

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Summary of Contents for Amplicon 485HF9

  • Page 1 9 PIN RS-232 TO RS-422/485 This Instruction Manual is supplied with the Model 485HF9 Adaptor 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 HOLLINGDEAN ROAD BRIGHTON BN2 4AW UK We declare that the product(s) described in this Instruction Manual are manufactured by Amplicon Liveline Limited and perform in conformity with the following standards or standardisation documents: Electro Magnetic Compatibility (EMC): EMC Directive 89/336/EEC...

  • Page 3: Table Of Contents

    MODEL 485HF9 MANUAL CONTENTS PARA SUBJECT PAGE INTRODUCTION General Description Technical Features What the Package Contains The Amplicon Warranty Covering the Model 485HF9 Adaptor Contacting Amplicon Liveline Ltd for Support or Service 1.5.1 Technical Support 1.5.2 Repairs INSTALLATION INSTRUCTIONS Requirements of Host Equipment Connections to Model 485HF9 Adaptor 2.2.1...

  • Page 4: Introduction

    RS-232 RS-485 The Model 485HF9 Adaptor is equipped with a 9 way, female D type connector. Many RS-232 devices are similarly equipped, and when properly configured and powered, the adaptor can be plugged into the appropriate port to convert the transmit and receive signals to RS-422/485 levels.

  • Page 5: What The Package Contains

    When removed from the bag, inspect the board for any obvious signs of damage and notify Amplicon if such damage is apparent. Do not apply power to a damaged board and do not plug it into the host computer. Keep the protective bag for possible future use in transporting the module.

  • Page 6: Contacting Amplicon Liveline Ltd For Support Or Service

    1.5.2 Repairs If the Model 485HF9 Adaptor requires repair then please return the goods enclosing a repair order detailing the nature of the fault. If the product is still under warranty, which is for a period of 12 months from the date of shipment, there will be no repair charge unless the fault has been caused by misuse.

  • Page 7: Installation Instructions

    9 way D type male connector (DB-9). If the host device is equipped with a 9 way connector, it is normally male, and the 485HF9 Adaptor can be directly plugged into this port and held in position by its jack screws.

  • Page 8: Rs-422/485 Connections On 8 Way Pluggable Terminal Strip

    Adaptor for ease of making the cables without removing the Adaptor from the port. The connections are compatible with other 485 Adaptors in the Amplicon range, and are shown in figure 2.2 below. The diagram shows the connector as viewed from the top face of the Model 485HF9 Adaptor.

  • Page 9: Configuration Options

    Model 485HF9 from figure 2.3 which illustrates the non-component side of the printed circuit board. When an existing link is not needed, cut the copper tie with a craft knife or remove any solder bridge with a desoldering tool, and make solder links as indicated for the required configuration. The pads are placed close enough that a solder bridge can be easily made without using wire.

  • Page 10: Power Requirements

    919 135 69. See paragraph 2.4.1 for information on connecting this mains adaptor to the Model 485HF9 terminals. The 485HF9 Adaptor is fitted with an eight way pluggable terminal strip at its free end, and the power supply should be connected to terminals 7 and 8. Terminal 7 is Ground or negative, terminal 8 is the positive supply.

  • Page 11: Connecting The Amplicon Mains Adaptor

    6 mm. The black wire is negative and goes to terminal 7 (GND) of the 485HF9 Adaptor, and the black wire with a white stripe is positive and goes to terminal 8 (VDC). Section 5.3 gives the Amplicon order codes for the above adaptors.

  • Page 12: Selection Of Full/Half Duplex

    Model 485HF9 2.5.1 Selection of Full/Half Duplex In the full duplex position, the serial RS-422/485 signals are transmitted on the wire pair Tx and /Tx and the incoming signals are received on Rx and /Rx. In half duplex operation, the data signals are both transmitted and received on the two pairs externally wired in parallel.

  • Page 13: Selection Of Local Echo On/Off In Half Duplex Operation

    The Model 485HF9 Adaptor is equipped with a terminator resistor for the receiver input pair, and this resistor is connected into circuit by the J2 link on the printed circuit board. See figure 2.3.

  • Page 14: Network Biasing Resistors

    If this problem is encountered and a software solution is not viable, two extra resistors can be added externally to the 485HF9 transceiver at one end of the bus, so that the network is biased to about 1 volt when all transmitters are disabled. The arrangement is shown in figure 2.8.

  • Page 15: Software Installation

    Model 485HF9 Software Installation Software is not supplied with the 485HF9 Adaptor, but a choice of suitable software packages is available from Amplicon Liveline Ltd. to allow easy integration of serial communications into the user's application. The 485HF9 Adaptor connected via an existing RS-232 port will operate in conjunction with many commercially available communications and data acquisition packages that support RS- 232, RS-422 or RS-485 serial operations.

  • Page 16: Application Information

    The prefix 'RS' signifies Recommended Standard, and the three interface types, RS-232, RS- 422 and RS-485, are all well defined in the appropriate standards publications. The functions and features of the data interfaces presented by the Model 485HF9 Adaptor generally conform to normal industry practice employing subsets of the full standards.

  • Page 17: Electrical Levels

    Model 485HF9 3.2.1 Electrical Levels When checking out serial communications circuits, it is useful to know what signal levels to expect. The specified voltage levels of RS-232 data and control signals are summarised in the following table:- Interchange Voltage –3 to –15...

  • Page 18: Rs-422/485 Parameters

    RS-232 data transmission rates are specified up to 20 kBd but are sometimes as high as 115 kBd. The Model 485HF9 Adaptor can therefore be used up to 115 kBd and the maximum cable length of 1200 m will apply at all usable data rates.

  • Page 19: Multi-Drop Applications

    Model 485HF9 3.3.3 Multi-drop Applications RS-422 can provide limited multi-drop capability, using two twisted wire pairs in a broadcast mode. One wire pair connects one transmitter to multiple receivers, but if duplex operation is required, only one receiving station can answer back. See figure 3.3.

  • Page 20: Bus Termination

    (transceivers) so termination is necessary at both ends. Although the 485HF9 Adaptor will drive loads as low as 27 Ω, in general, RS-485 transmitter circuits are specified as being capable of driving a minimum load resistance of 60 Ω, so no more than two terminator resistors should be connected to any one bus.

  • Page 21: Testing And Troubleshooting

    4.1.2 Loop-back Testing Using a Simple BASIC Program The Model 485HF9 Adaptor can be tested in isolation of external influences such as the signal cables, other devices and the applications program by performing the following loop-back test. It is necessary to link the terminals as shown in figure 11, and run the 4 line BASIC program given below.
  • Page 22 Model 485HF9 OPEN "COM1:1200,N,8,1" AS #1 PRINT #1,"Loop-back test passed" LB$=INPUT$((21),#1) PRINT LB$ The parameters in line 10 can be changed as required to perform the test at different baud rates etc. If tests with the applications software or other loop-back tests indicate that the 485 Adaptor is working properly, then the following should be investigated.

  • Page 23: Technical Information

    Model 485HF9 5. TECHNICAL INFORMATION Technical Specification The technical characteristics of the Model 485HF9 Adaptor are in accordance with the following electrical and physical specifications. Except where otherwise noted, all specifications are typical at 25º C 5.1.1 Electrical Specification Supply Voltage +5.0 VDC to +13.0 VDC...

  • Page 24: Optional Accessories

    (Brown - live, blue - neutral), 1.5 m length mains input cable. Two wire output cable of 2 m length. Moulded power connector to be removed for screw terminal connection to 485HF9 Adaptor. Wire with white stripe is positive, see paragraph 2.4.1. J1 Transmit Enable RTS/EXT...
  • Page 25 Model 485HF9 Page 25...

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