Amplicon 485HF9 User manual

Model 485HF9
Page 1
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

Model 485HF9
Page 2
DECLARATION OF CONFORMITY
AMPLICON LIVELINE LIMITED
CENTENARY INDUSTRIAL ESTATE
HOLLINGDEAN ROAD
BRIGHTON BN2 4AW UK
We de
clare 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
LVD Directive 73/23/EEC
CE Directive 93/68/EEC
Jim Hicks, I. Eng, MIEIE
Managing Director
Amplicon Liveline Limited

Model 485HF9
Page 3
PARA SUBJECT PAGE
1 INTRODUCTION 4
1.1 General Description 4
1.2 Technical Features 4
1.3 What the Package Contains 5
1.4 The Amplicon Warranty Covering the Model 485HF9 Adaptor 5
1.5 Contacting Amplicon Liveline Ltd for Support or Service 6
1.5.1 Technical Support 6
1.5.2 Repairs 6
2 INSTALLATION INSTRUCTIONS 7
2.1 Requirements of Host Equipment 7
2.2 Connections to Model 485HF9 Adaptor 7
2.2.1 RS-232 Connections on 9 way D Connector 7
2.2.2 RS-422/485 Connections on 8 way Pluggable Terminal Strip 8
2.3 Configuration of Model 485HF9 Adaptor Options 8
2.4 Power Requirements 10
2.4.1 Connecting the Amplicon Mains Adaptor 11
2.5 Full Duplex / Half Duplex Operation 11
2.5.1 Selection of Full / Half Duplex 12
2.5.2 Selection of Transmit Enable Control Signal 12
2.5.3 Selection of Local Echo On/Off in Half Duplex Operation 13
2.6 Transmission Line Termination 13
2.6.1 Network Biasing Resistors 14
2.7 Software Installation 15
2.8 Installation Testing 15
3 APPLICATION INFORMATION 16
3.1 Applicable Standards 16
3.2 RS-232 Application Notes 16
3.2.1 Electrical Levels 17
3.2.2 9/25 Way Adaptors 17
3.3 RS-422 / 485 Application Notes 17
3.3.1 RS-422 / 485 Parameters 18
3.3.2 Cabling of RS-422 / 485 Bus 18
3.3.3 Multi-drop Applications 19
3.3.4 Bus Termination 20
4 TESTING AND TROUBLESHOOTING 21
4.1 Basic Testing and Fault Isolation 21
4.1.1 Testing with the Application Software 21
4.1.2 Loop-back Testing Using a Simple BASIC Program 21
5 TECHNICAL INFORMATION 23
5.1 Technical Specification 23
5.1.1 Electrical Specification 23
5.1.2 Physical/Environmental Specification 23
5.2 Optional Accessories 24
5.2.1 U.K. Mains Adaptor Power Supply 24
5.2.2 Universal Mains Adaptor Power Supply 24
FIG Nº TITLE PAGE
2.1 RS-232 Connections 7
2.2 RS-422/485 Connections 8
2.3 Configuration Options 9
2.4 Power Supply Connections for Single 485HF9 Adaptor 10
2.5 Power Connections for Multiple Model 485 Adaptors 11
2.6 Connections for Full and Half Duplex Operations 12
2.7 External Transmitter Enable Connections 13
2.8 Network Biasing Resistors 14
3.1 DTE Adaptor - 9 Way to 25 Way 17
3.2 RS-232/422/485 Parameters 18
3.3 RS-422 Connected in Broadcast Mode 19
3.4 RS-485 Connected in Multi-drop, Half Duplex Mode 20
4.1 Terminal Links for Loop-back Test 21
A.1 Model 485HF9 Circuit Schematic 24
MODEL 485HF9 MANUAL CONTENTS

Model 485HF9
Page 4
1. INTRODUCTION
1.1 General Description
The Model 485HF9 Adaptor is a compact, plug-in unit providing bi-directional conversion of
serial data communications signals between the following standards:-
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. RS-232 hardware handshaking lines are looped back, and the RS-232 Request To Send
(RTS) control line can be used for RS-485 transmission turnaround if required. The unit is
supplied for the RS-232 host device configured as Data Terminal Equipment (DTE).
The data conversion process changes only electrical levels, and the pin-out configuration is in
accordance with the appropriate standards. The adaptor itself is not considered as DTE or
DCE, and where these terms are used, they apply to the RS-232 equipment to which the Model
485HF9 Adaptor is connected.
RS-485 multi-drop operation allows up to 32 devices to be connected in a simple network on a
single serial bus. The transmitter has a tri-state output and may be disabled to allow reception
over the same wire pair. The high impedance state (transmitter disabled) is commanded from
an external control signal or from the host computer RTS line.
DC power for the Model 485HF9 Adaptor must be applied from an external source. The DC
power lines plus the RS-422/485 data and control signals are connected through a pluggable 8
way screw terminal assembly at the free end of the Adaptor.
EMC Considerations
In order to maintain compliance with the EMC directive, 89/336/EEC, it is mandatory that the
final system integrator uses good quality screened cables for external connections. It is up to
the final system integrator to ensure that compliance with the Directive is maintained. Amplicon
Liveline offers a series of good quality screened cables for this purpose. Please contact our
sales staff.
1.2 Technical Features
•RS-422 or RS-485 compatible
•Multi-drop capability
•Plugs directly into standard 9 pin male connector
•Configured for operation with DTE host
•Single power supply connection. Polarity protected
•Remote connections via pluggable terminal strip
•Compact and versatile
RS-232 RS-422
OR
RS-232 RS-485

Model 485HF9
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1.3 What the Package Contains
1. The Model 485HF9 Adaptor board with 8 way free socket and the plastic case
disassembled. The plastic case should not be snapped together until any necessary
configuration changes have been made.
The complete 485HF9 Adaptor is supplied under Amplicon order code 909 458 03
Some of the components on the board are susceptible to electrostatic discharge, and
proper handling precautions should be observed. As a minimum, an earthed wrist strap
must be worn when handling the 485HF9 Adaptor outside its protective bag.
Full static handling procedures are defined in British Standards Publication
BSEN100015/BSEN100015-1:1992
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.
2. This 485HF9 Instruction / Reference manual. Amplicon part number 859 864 34
Any additional accessories (mating gender changers, power supply etc.) may be packed
separately.
1.4 The Amplicon Warranty Covering the Model 485HF9 Adaptor
This product is covered by the warranty as detailed in the Terms and Conditions stated in the
current domestic or international Amplicon Liveline catalogue.
Changes made in accordance with the guidelines given in this manual will not void this
warranty unless any damage is a direct consequence of mishandling.
DO NOT MAKE ANY MODIFICATIONS TO A PRODUCT THAT IS ON EVALUATION.
! CAUTION

Model 485HF9
Page 6
1.5 Contacting Amplicon Liveline Limited for Support or Service
The Model 485HF9 Adaptor is designed and manufactured by Amplicon Liveline Ltd.
Maintenance is available throughout the supported life of the product.
1.5.1 Technical Support
Should the Model 485HF9 Adaptor appear defective, please check the information in this
manual to ensure that the product is being correctly applied.
If an application problem persists, please request Technical Support on one of the following
numbers:
Telephone: UK 0906 293 0293
Fax: UK 01273 570 215
Internet [e-mail]
www.amplicon.co.uk
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.
For traceability when processing returned goods, a Returned Materials Authorisation (RMA)
procedure is in operation. Before returning the goods, please request an individual RMA
number by contacting Amplicon Customer Services by telephone or fax on the above numbers.
Give the reason for the return and, if the goods are still under warranty, the original invoice
number and date. Repair turnaround time is normally five working days but the Service
Engineers will always try to co-operate if there is a particular problem of time pressure.
Please mark the RMA number on the outside of the packaging to ensure that the package is
accepted by the Goods Inwards Department.
Address repairs to: Customer Services Department
AMPLICON LIVELINE LIMITED
Centenary Industrial Estate
Brighton, East Sussex
BN2 4AW
England
Calls cost 25p per min from a BT landline. Calls from other services may vary

Model 485HF9
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2. INSTALLATION INSTRUCTIONS
2.1 Requirements of Host Equipment
The Model 485HF9 Adaptor can be plugged into any device with an RS-232 port terminating in
a 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.
In addition to the 9 pin standard, many RS-232 interface connectors comply with the DB-25
standard and two types of 485 Adaptor are available from Amplicon Liveline Ltd to mate with
male or female versions of the DB-25 connector. In addition, DIN, mini-DIN and other types of
connector are sometimes used for RS-232 ports. If the pin connections of the host device
interface are known, then enough information is given in this manual to make up a suitable
adaptor connection cable.
2.2 Connections to Model 485HF9 Adaptor
Connections are made to the Model 485HF9 Adaptor at each end. The RS-232 connections are
automatically made when the Adaptor is plugged into the port, and the RS-422/485 data,
control and power connections must be made through a pluggable 8 way screw terminal
connector assembly at the free end.
2.2.1 RS-232 Connections on 9 way D Connector
The connections conform to the RS-232 adopted 9 way pin-out standard, and are shown in
figure 2.1 below. The diagram shows the connector as viewed from the face of the socket
mounted on the Model 485HF9 Adaptor.
FIGURE 2.1 RS-232 CONNECTIONS
1
6
2
7
3
8
4
9
5
Data Set Ready (DSR)
Request To Send (RTS)
Clear To Send (CTS)
Ring Indicator (RI)
Data Carrier Detect (DCD)
Receive Data (RxD)
Transmit Data (TxD)
Signal Ground (SG)
Data Terminal Ready (DTR)
RS-232 connections on 9 way socket

Model 485HF9
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2.2.2 RS-422/485 Connections on 8 way Pluggable Terminal Strip
The DC power input, RS-485 transmission turnaround external control signal and RS-422/485
data signal connections are made via an eight way screw terminal connector. The supplied
connector can be unplugged from the 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. The abbreviated function names are printed on the PCB extension below the
fixed part of the connector.
FIGURE 2.2 RS-422/485 CONNECTIONS
2.3 Configuration of Model 485HF9 Adaptor Options
Configuration of the options is undertaken by cutting or bridging solder pad links on the reverse
(non-component) side of the Model 485HF9 Adaptor printed circuit board. The Adaptor as
supplied is configured to suit the majority of applications requiring full duplex operation or half
duplex with echo.
For convenience, the plastic case is supplied in two parts and should only be clipped together
when any configuration changes have been made. Operational tests can be performed before
the case is fitted.
The configuration options listed below are available, and the appropriate connection bridges
are shown in figure 2.3.
J1 Transmit Enable - RTS or External. (Factory configuration is 'External TXEN’)
J2 Receiver termination in or out. (Factory setting is 'IN')
J3 Receive echo on or off. (Factory setting is echo on)
The configuration options are described in more detail in the following paragraphs. For many
applications, no changes need be made, but if re-configuration is required, locate the pad group
1 EN /Transmit Enable
2 GND Ground
3 TX - B Transmit Data
4 TX - A /Transmit Data
5 RX - A’ /Receive Data
6 RX - B’ Receive Data
7 GND Power Ground
8 VDC +5.0 to +13 VDC I/P
RS-422/485 power, data and control connections

Model 485HF9
Page 9
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. Before
applying power to the Adaptor, inspect the changes carefully to ensure that the solder has
properly wetted the pads and that no other bridges have been made.
FIGURE 2.3 CONFIGURATION OPTIONS
EN
J2
GND
J3
J1
GND
VDC
B
A
A’
B’
Transmit Enable
External TXEN
Transmit Enable
RTS
Receive Echo
ON
Receive Echo
OFF
UNLINKED
COPPER
PAD PAIR
PADS WITH
SEVERED
LINK
PADS WITH
SOLDER
BRIDGE
KEY
PADS WITH
SEVERABLE
LINK
RX Line Terminator
IN
RX Line Terminator
OUT
J2
J1J3

Model 485HF9
Page 10
2.4 Power Requirements
The Model 485HF9 Adaptor must be powered from an external power supply providing a
positive output of between +5.0 VDC and +13.0 VDC. This auxiliary power supply unit should
be capable of sourcing at least 100 mA for each 485 Adaptor that it supplies. Within this
constraint, as many 485 Adaptors as are required can be fed from a single supply. The
Amplicon Mains adaptor meets this requirement and the U.K. version is available under order
code 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. OBSERVE POLARITY when powering the adaptor. If the
polarity is incorrect, the 485HF9 Adaptor will not operate, but is protected against damage. A
wiring diagram for applying power to a single 485HF9 Adaptor is shown in figure 2.4 and the
connections to multiple, parallel powered 485HF9 Adaptors are shown in figure 2.5.
FIGURE 2.4 POWER SUPPLY CONNECTIONS FOR SINGLE MODEL 485HF9 ADAPTOR
When multiple 485 Adaptors are fed from a single supply as in figure 2.5, the grounds of all the
devices on the RS-422/485 bus will be connected together through the common negative
supply line and the internal ground connections of the Adaptors.
POWER SUPPLY
5.0 to 13.0 VDC
–
+
Model
485HF9
Adaptor
EN
1
GND 2
TX 3
TX
4
RX
5
RX 6
GND 7
VDC
8