ASeries A451 User Manual Interface Converter
Contents
1. Signal Ground 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 Factory Default DCE DTE Switch Setting The Factory Default for the RS 232 Port is DCE RS 485 Serial Port Pinout Pin number 1 for each RJ 45 connector is shown here in the diagram The two RJ 45 connectors are identical in pin assignment and are connected in parallel The signals associated with each pin depend on the configuration of the jumper JP1 Please refer to Section 3 2 for these details Factory Default JP1 Jumper Setting The A451 is shipped with JP1 set to Standard 4 wire configuration as shown here ioiii DCE lt gt DTE E 5 a Standard 4 wire Factory Default A451 User Manual 6 0 6 1 6 2 7 0 7 1 CABLE GROUNDING 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 RS 232 Cable Construction 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 cab2. ce ei vo DB 9 Female DSA 20 lt gt 4 DTR 7 4 RS 232 Cable for Other Devices Shield A451 Cable End FG 1 e Fc RD 2 _ 1D ONE a RD User Device DCE CTS 4 oeo RTS RTS 5 e _ cis DTR 6 _ DSR Ca Cable End se 7 e e sG DB 25 Male DCD 8 e _ pcp DSR 20 E OTR A451 User Manual 8 0 SPECIFICATIONS RS 232C Port Asynchronous RS 232C V 24 Select as DCE or DTE DB 25 female connector Speed capability dependant on cable length up to 64k bits per second RS 485 Port RS 485 Two RJ 45 connectors for multidrop setup Switchable 1200hm Termination for RD line LED Indicators Receive Data RS 232 Green Receive Data RS 485 Green Power Supply 9V 200mA DC Power Adapter Reverse polarity protection Plug jack 5 5mm outer 2 5mm inner diameter Polarity is Outer Negative O _ Dimensions 84mm x 58mm x 23mm Weight 160 grams Operating Temperature 10 to 35 C Stroage Temperature 0 to 45 C All specifications subject to change without notice 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
3. Description of Signal Receive Data Plus RD Receive Data Minus RD Transmit Data Plus TD TD Transmit Data Minus TD Description of Signal RD and TD RD and TD JP1 a m Standard 4 wire Factory Default DUDUL e JP1 Crossed 4 wire Configuration Uo oth Io a U 2 wire Configuration UUU 3 3 3 4 A451 User Manual Other RS 485 Considerations When installing an RS 485 2 wire network the RS 485 transmitter must be controlled by the RS 232 serial device This transmitter may be controlled by either the RTS CTS or DTR DSR signals 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 If the distance of the RS 485 device is less than 100metres then it is not necessary to terminate the RS 485 bus Using A451s as RS 232 Line Extenders A pair of A451s may be used to extend the distance at which RS 232 data is transmitted The A451s are connected via their RS 485 ports to take advantage of the greater data transfer distances achievable with RS 485 The following examples show how to connect two A451s together via their RS 485 ports using various cable types Note that the internal jumper JP1 must be set as per these diagrams Example 1 Using a S
4. User Manual ASeries A451 Interface Converter RS 232 amp RS 485 Multidrop ALFATRON The interfacing specialists A451 User Manual Version 1 00 April 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 u
5. gt RS 485 Interface Converter Model Number A451 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
6. le RS 485 Cable Construction While the RS 485 differential signal does not require a ground signal for communication we recommend that a ground wire is always connected in an RS 485 Multidrop Network The longer distances available with RS 485 can present significant differences in the voltage levels of the Ground signal This can lead to loss of data and at the extreme cause damage to the equipment CABLE EXAMPLES RS 485 Cable from A451 to User Device Pin ae Pint D e RD Pi TD __ Socket RJ 45 gn e User Standard 4 wire Devi Pin6 RD e TD SGR Factory Default i j Pin7 GND e GND A451 User Manual 7 2 RS 232 Connection to a PC with a DB 25 Serial Connector ees See A451 Cable End FG 1 i FG RD 2 lt _ 2 TD TD 3 gt 3 RD PC Cable End DCE CTS 4 _ 4 RTS DTE RTS 5 5 CTS CURR DTR 6 gt 6 DSR Gee SG 7 o 7 SG DB 25 Male DCD 8 3 DCD DB 25 Female DSR 20 4_ 20 DTR 7 3 RS 232 Connection to a PC with a DB 9 Serial Connector Shield A451 Cable End RD 2 3 TD PC Cable End TD 3 gt 2 RD DCE CTS 4 gt 7 RTS RTS 5 8 CTS eee DTR 6 6 DSR Ocss23 0 SG 7 e ee 5 SG DB 25 Male near se
7. nauthorised modifications or misues 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 ACN 005 410 819 P O Box 4161 Unit 9 36 New St Ringwood VIC 3134 AUSTRALIA Email support alfatron com au Web Site www alfatron com au AUSTRALIAN MADE 1 0 2 0 2 1 A451 User Manual PRODUCT DESCRIPTION The ASeries A451 is an RS 232 to RS 485 Multidrop interface converter using standard RJ 45 Ethernet cabling on the RS 485 side On the RS 232 side a DCE DTE switch is provided for easy reversing of the TD and RD signals The RS 485 port will support up to 32 drivers and 32 receivers over a cable length of 1200 metres at speeds up to 115Kbps Transient Protection is also provided on the RS 485 lines Full Duplex 4 wire or Half Duplex 2 wire operation may be used on RS 485 and internal jumper settings permit the use of either standard or crossed Ethernet cables The layout of the A451 is as follows DCE DTE Selection JF En ooo0oo0o000000000 O oo0oo0oo000000000 Pow RS 232 Mae Jack RS 485 Port ooo Connectors RS 485 RD DIP Switch Green Figure 1 A451 viewed from all sides INSTALLATION Before installing the A451 please make sure that the DIP Switch settings are according to the requirement of the RS 485 target device It is also important to
8. select the RS 232 port as either DCE or DTE Make sure that all cables are terminated and then insert the power plug into the jack socket and turn the power ON The A451 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 A451 User Manual 3 0 3 1 3 2 INTERFACE APPLICATION NOTES About the RS 232 Port The RS 232 connection is switch selectable as either DTE or DCE For connection to a standard PC with a straight through serial cable select DCE When operating the A451 without the power adapter it is necessary to connect the CTS RTS and DTR DSR signals as the power is drawn from these lines 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 About the RS 485 Port The RS 485 port may be configured for either a 4 wire or a 2 wire network This is done simply be choosing the appropriate jumper setting on the connector JP1 located behind the RJ 45 sockets as follows Description of Signal ee ae Transmit Data Plus TD 7 7 7 Transmit Data Minus TD Receive Data Plus RD Receive Data Minus RD
9. tandard RJ 45 Ethernet Cable 1_ JP1 3 1_ JP1 mm Straight Through Cabl CJ os lt raig rough Cable lt q ata so gt gt ie ofa a MN socket one C Example 2 Using a Crossed RJ 45 Ethernet Cable 1 JP 1_ JP1 m m lt Crossed Cable 3 lt q m Cd ee gt gt Oe oa oud OC Note Using a Crossed Cable requires no changes to the Factory Set JP1 3 A451 User Manual 4 0 CONFIGURATION OF THE RS 485 PORT 4 1 4 2 RS 485 DIP Switch Settings DIP Switch 2 3 4 RS485 transmitter Enabled when DTR DSR is High RS485 transmitter Enabled when RTS CTS is High RS485 transmitter ALWAYS Enabled RS485 transmitter NEVER Enabled Monitor Mode RS485 receiver always enabled local echo for 2 wire RS485 disabled Factory Default RS 485 DIP Switch Settings RS 485 Transmitter ALWAYS enabled RS 485 Receiver ALWAYS enabled local echo for 2 wire RS 485 LEDs indicate RD TD Data Flow No Termination on RS 485 Receiver 5 0 5 1 5 2 5 3 5 4 INTERFACE PORT PIN ASSIGNMENTS RS 232 Serial Port Pinout Pin Status Set for DCE 1 Used Frame Ground 2 Input Output RD 3 Output Input TD 4 Linked to Pin 5 CTS 5 Linked to Pin 4 RTS 6 Linked to Pin 20 DTR T7 Used Signal Ground 8 Not used Pulled High 4K7 DCD 20 Linked to Pin 6 DSR A451 User Manual Set for DTE Frame Ground TD RD RTS CTS DSR
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