ASeries A430 User Manual Interface Converter
Contents
1. 0 is 64kbps and that all loop lengths are measured in one direction only 1000 10 Distortion Data Rate Le Loop 20mA D 100 O 64 CE fe nm uy mn mm dm um ne E mt Z D E av eG oa 10 amp ES fav _ A Mae Vcc 4 10V dc Soe Sk a e TT 10 100 1000 10 000 Loop Length One Direction Metres Figure 1 2 Typical Data Rate versus Distance 2 0 2 1 A430 User Manual INSTALLATION All configuration and cabling to the A430 must be done while NO power is connected to the unit Noconfiguration required on the RS422 EIA530 port except for DCE DTE selection as the data rate is controlled by the driving device Onthe 20mA Current Loop side the A430 is configured via two slide switches These switches are located on top of the A430 as shown in Figure 1 For details of the switch configuration please refer to Section 6 Connect and secure the appropriate cables to the A430 Sections 4 and 5 contain details on cables along with various cable examples After all cables have been connected and secured insert the power plug into the jack socket and turn the power ON The A430 is now ready for use LED indicators The Current Loop Receive Data RD LED indicator will flash each time data is being received by the 20mA Current Loop Port The RS422 Serial Receive Data RD LED indicator will flash each time data is being received by the RS422 Serial Port These L2. D is for Transmit and the switch marked RD is for Receive RD TD Active Transmit P Factory Passive Receive A Default RD TD Passive Transmit P Active Receive A RD TD Active Transmit P Active Receive A RD TD Passive Transmit P Passive Receive A Applications requiring Isolation For applications requiring isolation it is recommended that the A430 be configured with Passive Transmit and Passive Receive Factory Default The A430 is shipped from the factory with the links set to Active Transmit and Passive Receive as per item A above A430 User Manual 7 0 SPECIFICATIONS Serial Port Current Loop Port Handshaking LED Indicators Power Supply Dimensions Weight Operating Temperature Stroage Temperature Asynchronous RS 422 Standard Select as DCE or DTE DB 25 female connector Speed is dependant on cable length Maximum speed is 64kbps 20mA Current Loop Screw Terminal Block x 4 2 5mm diameter Receive Data and Transmit Data loops each configurable as either ACTIVE or PASSIVE Optically isolated for 20mA signal Isolation in PASSIVE mode only Software Handshaking Xon Xoff Receive Data RS422 Green Receive Data Current Loop Green Power Yellow 9V 200mA DC Power Adapter Reverse polarity protection Plug jack 5 5mm outer 2 5mm inner Outer Negative G e 84mm x 58mm x 23mm 160 grams 10 to 35 C 0 to 45 C All specifications subject to change w
3. EDs will not operate at any other time Note The 20mA Current Loop Standard specifies that 20mA in the loop represents the no data idle state while OmA represents the data state If nothing is connected to the 20mA Receive Data then the loop effectively carries no current i e data state and the Current Loop RD LED will remain ON A430 User Manual 3 0 INTERFACE PORT PIN ASSIGNMENTS 3 1 RS 422 EIA530 Serial Port The RS 422 EIA530 Serial Port of the A430 may be configuired as DCE or DTE via a slide switch on the side of the unit as shown in Figure 1 Pin Status Set for DCE Set for DTE 1 Used Frame Ground Frame Ground 2 Input Output RD TD 3 Output Input TD RD 7 Used Signal Ground Signal Ground 14 Input Output RD TD 16 Input Output TD RD The Factory Default RS 422 Serial switch setting is DCE as follows DCE lt gt DTE CE 3 2 20mA Current Loop Port Pinout S Transmit Data Minus Transmit Data Plus S Receive Data Minus D Receive Data Plus 4 0 4 1 4 2 A430 User Manual CABLE REQUIREMENTS Alfatron Pty Ltd recommends the use of shielded cable with all of its products Shielding reduces Electro Magnetic Radiation and improves noise immunity This helps minimise interference to other equipment and will improve the communications reliability Cable Construction The recommended cable construction is as follows Take the shield surrounding cable
4. User Manual ASeries A430 Interface Converter RS 422 20mA Current Loop ALFATRON The interfacing specialists A430 User Manual Version 1 10 May 1999 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 1999 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 unaut
5. horised 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 Web Site www alfatron com au AUSTRALIAN MADE A430 User Manual 1 0 1 1 PRODUCT DESCRIPTION The ASeries A430 is an RS422 to 20mA Current Loop level converter This product has been engineered to be used in both industrial and office environments The physical layout of the product is shown in the following diagram TD RD TD 20mA Current Loop P Active Passive gt WAE O Selection Switches D O RD Power Jack RS422 Receive Data RS422 Serial Current Loop EIA530 Port Terminals Power O Yellow f f DCE DTE 20mA Receive Data Selection Green Figure 1 1 A430 viewed from each angle Overview of Features The A430 has a number of features which make it particularly useful in industrial environments and inter building connections The RS422 port is set up according to the EIA530 Standard and therefore uses a DB25 connector The Current Loop interface is particularly suited to environments with poor grounding or grounding problems High data transfer rates are possible over long distances e g 19 200bps at a 400 metre length Optically isolated data lines
6. ithout 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 422 to 20mA Current Loop Interface Converter Model Number A430 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
7. provide immunity to ground imbalance for example between buildings Units may be ordered as a pre set fully isolated pair 2500Vac for 1 minute Full duplex point to point communication uses only 4 wires one pair each for receive and transmit data Fully configurable Transmitter and Receiver sections each unit may be either Active or Passive so the unit may be used in any installation A430 User Manual 1 2 1 3 Isolation Details The electrical isolation provided by the A430 is in three sections as follows a Power Supply Isolation The A430 is supplied with authority approved power adapters which provide the initial mains supply to data link isolation b Isolation by Configuration In a 20mA Current Loop installation typically one side is configured as an isolated unit while the other is a non isolated unit The isolated unit has full breakdown isolation and is typically installed on the sensitive side c Data Link Isolation The line drivers and receivers used in the A430 are specified to withstand 2500Vac for one minute The design of the A430 allows this specification to be realised on the isolated unit Maximum Loop Lengths and Data Rates In the A430 converter the maximum loop length is limited by the current loop cable resistance and the maximum data rate by the RS232 driver Typical data rate performance versus distance is shown in the following graph Please note that the maximum data rate of the A43
8. 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 only be connected at both ends of the cable Cable Diagrams The cable diagrams in this manual represent the cable shield in the following manner Shield Figure 3 Example of Shield representation in Cable Diagrams This shows the shield soldered to FG at both ends of the cable and shows the shield running the full length of the cable Please note that the shield is treated as a totally separate wire Note The Current Loop cable should not be shielded because connecting it to Ground at either side would render the optical isolation redundant A430 User Manual 5 0 CABLE EXAMPLES 5 1 RS 422 Connection to Other RS 422 Devices Shield A430 Cable End FG tei Co Fe DCE RD 2 e TD TD 3 6 __ RD SigGND 7 SigGND R ao aeoo et DB 25 Male TD 16 _ RD 5 2 Connecting 20mA Current Loop TD S RD A430 Cable End ee 1S TD Q TD User Device Cable End User Device Cable End Note Sheilding and grounding wires are not recommended for Current Loop cables 6 0 6 1 6 2 A430 User Manual CURRENT LOOP CONFIGURATION Please refer to Figure 1 1 for the location of the 20mA Current Loop slide switches The switch marked T
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