ASeries A450 User Manual Interface Converter
Contents
1. DB 25 Male DCD f 8 DCD DB 25 Female DSR 0 DTR NO O NO A450 User Manual 7 3 RS 232 Connection to a PC with a DB 9 Serial Connector A450 Cable End RD TD DCE CTS RTS LD DTR DB 25 Male e DSR CONDO OF DY Shield 7 4 RS 232 Cable for Other Devices FG A450 Cable End pp TD CTS DCE RTS LD 0m DB 25 Male LS DSR CON OOF ND NO O Shield TD RD RTS CTS DSR DCD TR AA O10 ON NY W w FG TD RD RTS CTS DSR SG DCD DTR H PC Cable End ofso DB 9 Female User Device Cable End A450 User Manual 8 0 SPECIFICATIONS RS 232C Port RS 485 Port Transient Protection LED Indicators Power Supply Dimensions Weight Operating Temperature Stroage Temperature Asynchronous RS 232C V 24 Select as DCE or DTE DB 25 female connector Speed capability dependant on cable length up to 115 2k bits per second RS 485 5 position Screw Terminal Block Switchable 1200hm Termination for RD line Transient Voltage Supression Diodes on RS 485 TX and TX RX and RX Surge capacity of 1500 Watts per device at 1ms Response Time of less than 1ps Steady state power dissipation rating of 5 Watts Receive Data RS 232 Green Receive Data RS 485 Green Accepts 9V 12V DC on input Supplied with 9V 200mA DC Power Adapter Reverse polarity protection Plug jack 5 5mm outer 2 5mm inner diameter Polarity is Outer2. Input TD 4 Linked to Pin 5 CIS 5 Linked to Pin 4 RTS 6 Linked to Pin 20 DTR 7 Used Signal Ground 8 Not used Pulled High 4K7 DCD 20 Linked to Pin 6 DSR A450 User Manual Set for DTE Frame Ground FG TD RD RTS CTS DSR Signal Ground SG DCD DTR Note Pins 4 5 6 8 and 20 are pulled to the correct levels to allow a PC serial port to operate under most conditions without any additional loopback connections 5 2 RS 485 Serial Port Pinout A450 User Manual 6 0 CABLE REQUIREMENTS Alfatron recommends the use of shielded cable with all of its products Shielding reduces EMI Radiation and improves noise immunity This helps minimise interference to other equipment and will improve communications reliability The recommended cable construction is as follows Take the shield surrounding cable wires and solder it to the Frame Ground FG pin If FG is not available use Signal Ground SG but in this case always use a separate wire for ground which is connected at both ends The shield must be connected at both ends of the cable 7 0 CABLE EXAMPLES 7 1 RS 485 Cable from A450 to User Device RD _ RD __ User A450 TD Device TD se _ FG 7 2 RS 232 Connection to a PC with a DB 25 Serial Connector ROSES FG 1 1 FG A450 Cable End RD D 2 TD TD 3 3 3 gt 3 RD PC Cable End DCE CTS 4 4 RTS DTE RTS 5 5 TS LD O 6 de OR xp SG oe 7 SG
3. unauthorised modifications or misuses operation outside the environmental specifications for the product damage due to power surges lightening strikes or any other phenomenon outside normal operational specifications Alfatron Pty Ltd ABN 65 005 410 819 P O Box 4161 Unit 9 36 New St Ringwood VIC 3134 AUSTRALIA SUS TR ALLA MACE Web Site www alfatron com au 1 0 2 0 2 1 A450 User Manual PRODUCT DESCRIPTION An RS 232 to RS 485 point to point or multi drop interface converter incorporating the following features Screw terminal connection for RS 485 DCE DTE switch selectable RS 232 uses DB25 connector Transient Voltage Supression diodes used on RS 485 lines Transmit data at up to 115 2Kbps Transmit RS 485 up to 1200 metres Non powered RS 485 operation up to 100 metres using point to point RS 485 multi drop up to 32 driver and 32 receivers on 4 wire setup Switchable termination resistors for RS 485 port Monitor mode on RS 485 bus for fault diagnosis ss mm 102 000000000000 DCE DTE Switch OI RS 485 RD SW1 RS 232 Port ony AAC INSTALLATION Before installing the A450 please make sure that the DIP Switch settings are according to the requirement of the RS 485 target device It is also important to select the RS 232 port as DCE or DTE Make sure that none of the RS 485 lines are shorting onto the case and after all cables have been connected and secured insert the power plug into
4. G e e SG Using the RS 232 Port The RS 232 connection is switchable between DTE or DCE To connect to a PC with a straight through serial cable chose DCE Power is drawn from CTS RTS and DTR DSR therefore it is necessary to connect these if the A450 is to be used in non powered mode In most applications it is necessary to connect all of the commonly used pins on the RS 232 port i e 1 2 3 4 5 6 7 8 and 20 on a DB25 interface 3 3 3 4 A450 User Manual Using A450s as RS 232 Line Extenders A pair of A450s may be used to extend the distance at which RS 232 data is transmitted The A450s are connected via their RS 485 ports to take advantage of the greater data transfer distances available using RS 485 The following is an example of the cable which is recommended to connect two A450s together via their RS 485 ports A TD TD amp NX TD TD IN A450 KJ RD RD LA A450 NJ RD RD N 43 GND e _e GND KA Transient Protection Power surges or electrical transient voltages can be induced into cabling by such things as lightning strikes electric motors switches and the operation of heavy industrial equipment The use of long cables also increases the exposure to transient voltages A transient of the correct magnitude can destroy an unprotected interface converter It is also possible for certain transients to pass though an unprotected i
5. Negative Oe 84mm x 58mm x 23mm 160 grams 10 to 35 C 0 to 45 C All specifications subject to change without notice 10 N42 DECLARATION OF CONFORMITY according to the European Commissions EMC Directive 89 336 EEC We Name of Manufacturer ALFATRON PTY LTD of Address of Manufacturer UNIT 9 36 NEW ST RINGWOOD VIC 3134 AUSTRALIA Australian Company Number ACN 005 410 819 declare under sole responsibility that the product Product Name ASeries RS 232 lt gt RS 485 Interface Converter Model Number A450 to which this declaration relates is in conformity with the following standards CISPR 22 EN 55022 class B EMI from Information Technology Equipment ITE IEC 801 2 prEN55024 2 Electro Static Discharge Immunity IEC 801 3 prEN55024 3 Radiated RF Immunity IEC 801 4 prEN55024 4 Electrical Fast Transients Immunity AS NZS 3548 lt 1995 EMI from Information Technology Equipment ITE
6. User Manual ASeries A450 Interface Converter RS 232 RS 485 Multi drop ALFATRON the interfacing specialists A450 User Manual Version 1 03 October 2000 COPYRIGHTS All rights reserved This document may not in whole or part be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form without the express permission in writing from Alfatron Pty Ltd Copyright 2000 Alfatron Pty Ltd DISCLAIMER Alfatron Pty Ltd has made every attempt to ensure that the information contained in this document is accurate and complete Alfatron Pty Ltd makes no representation or warranties of merchantability or fitness for any particular purpose Alfatron Pty Ltd reserves the right to make changes to this document at any time without notice Therefore Alfatron Pty Ltd assumes no liability for damages incurred directly or indirectly from errors omissions or discrepancies with the hardware and the manual TRADEMARKS All Company and Product names are trademarks of the Company or Manufacturer respectively WARRANTY Alfatron warrants its products against defects in materials and workmanship for a period of one year from receipt by the customer All warranty is carried out on a return to depot basis unless an alternative warranty coverage has been arranged WARRANTY EXCLUSIONS The above warranty shall not apply to defects resulting from improper or inadequate maintenance by the customer
7. nterface converter and cause damage to the equipment which is attached By using High Speed Transient Voltage Suppressors on its communication lines the A450 absorbs much of the transient energy on these lines and helps clamp these surge voltages to a safe level This will ensure that both the A450 and any connected equipment are protected from damage due to transients The A450 uses a Transient Voltage Suppressor Diode on each of the following Transmitter pair TX and TX Receiver pair RX and RX Each diode has a response time of less than 1ps power dissipation of 1500 Watts for 1ms and a steady state power dissipation rating of 5 Watts A450 User Manual 4 0 HARDWARE CONFIGURATION 4 1 RS 485 DIP Switch Settings ptt 2 3 4 5 _e 2 o RS48s tranemiter Enabled when DTRYDSR is High _o o o R6485 tranemiter Enabled when RTSICTS is High o o o fo o rs488 ransmiter ALWAYS Enabled 0 0 e o RS405 ranemiter NEVER Enabled o o e ejejmontormoe n Semo PC EE 4 2 Default Factory DIP Switch Settings e RS 485 Transmitter ALWAYS enabled e RS 485 Receiver ALWAYS enabled local echo for 2 wire RS 485 LEDs indicate RD TD Data Flow e No Termination on RS 485 Receiver DCE lt gt DTE Factory Default for the RS 232 Port is DCE i 5 0 INTERFACE PORT PIN ASSIGNMENTS 5 1 RS 232C Serial Port Pinout Pin Status Set for DCE 1 Used Frame Ground 2 Input Output RD 3 Output
8. the jack socket and turn the power ON The A450 is now ready for use LED indicators The LEDs will operate only if DIP Switch 7 is set to the ON position The RD RS 232 LED indicator will flash each time data is being received by the Serial RS 232 Port The RD RS 485 LED indicator will flash each time data is being received by the RS 485 Serial Port These LEDs will not operate at any other time A450 User Manual 3 0 3 1 3 2 INTERFACE APPLICATION NOTES Using RS 485 in 2 wire mode To use a 2 wire bus simply connect together TX and RX to form the common BUS or BUSa line and RX with TX to form the common BUS or BUSb line When running a 2 wire RS 485 bus the RS 485 transmitter must be controlled by the RS 232 serial device This transmitter may be controlled by either the RTS CTS or DIR DSR handshake pairs If the RS 232 side is using software to control devices then it may require a local echo of what it transmits if so turn DIP Switch 6 to the OFF position Also if the distance of the RS 485 device is less than 100 metres then it is not necessary to terminate the RS 485 bus In a typical setup DIP switches 6 amp 2 would both be set to ON so that the tramsmitter would be controlled by the RTS CTS handshake pair Example of a typical 2 wire setup TD e RD TD e TD RD RD GND RD e e TD RTS e _ CTS 99119 c c S4 CTS e _e RTS S
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