Single Channel RS-422/485/530 Serial Interface for the PCI Bus
Contents
1. Shop online at omega com CEOMEGA www omega com e mail info omega com OMG ULTRA 485 PCl omega com ZCSONIEGR OMEGAnet Online Service Internet e mail www omega com info omega com USA ISO 9001 Certified Canada Servicing North America One Omega Drive Box 4047 Stamford CT 06907 0047 Tel 203 359 1660 FAX 203 359 7700 e mail info omega com 976 Bergar Laval Quebec H7L 5A1 Tel 514 856 6928 FAX 514 856 6886 e mail info omega ca For immediate technical or application assistance USA and Canada Mexico Benelux Czech Republic France Germany Austria United Kingdom ISO 9002 Certified Sales Service 1 800 826 6342 1 800 TC OMEGA Customer Service 1 800 622 2378 1 800 622 BEST Engineering Service 1 800 872 9436 1 800 USA WHEN TELEX 996404 EASYLINK 62968934 CABLE OMEGA En Espa ol 001 203 359 7803 e mail espanol omega com FAX 001 203 359 7807 info omega com mx Servicing Europe Postbus 8034 1180 LA Amstelveen The Netherlands Tel 31 0 20 3472121 FAX 31 0 20 6434643 Toll Free in Benelux 0800 0993344 e mail sales omegaeng nl Rude arm dy 1868 733 01 Karvina 8 Tel 420 0 69 6311899 FAX 420 0 69 6311114 Toll Free 0800 1 66342 e mail info omegashop cz 11 rue Jacques Cartier 78280 Guyancourt France Tel 33 0 1 61 37 29 00 FAX 33 0 1 30 57 54 27 Toll Free in France 08002. t t naen anaimani 5 TECHNICAL DESCRIPTION s ssss e CONNECTOR PIN ASSIGNMENTS ENN ENNEN E R ENE maa H RS 422 485 530 Pin Assignments DB 25 Male DIE 7 SPECIFICATIONS wosia cddecciasctcresssevecsansesenseeseiesssaccecsesesevecsancesesouesedecssessdeactesedecasvscsesseossas ENVIRONMENTAL SPECIFICATIONS cccssssccesssececesseececenscecesseeecsesaeeecseeaeeseseeecsesaeeeceeseeeesseeessesaeseceeaaeens 8 MANUFACTURING wa wA eke tbe A e os ee eae eed ot ete a aR eee 8 POWER CONSUMPTION e eGo Rieck tee ees i a a A he eS 8 PHYSICAL EE LEE 8 APPENDIX A TROUBLESHOOTING ssss0ss eee D APPENDIX B HOW TO GET ASSISTANCE LO APPENDIX C ELECTRICAL INTERFACE s sss eeece LL APPENDIX D ASYNCHRONOUS COMMUNICATIONS cccosssssssscscccccccccsccsscsccccccscesesssscccsscesesees LD APPENDIX E SILK SCREEN cccccccscsscsssvsscscccscecccsssescsccscccccssesescscosccsccscesescsccsccscescssescsccscesee 13 APPENDIX F COMPLIANCE NOTICES cccccccscssssssssscscccsccscescccccoccssccscesescscscccscescssescsccccssceee 14 FEDERAL COMMUNICATIONS COMMISSION STATEMENT t t t t t es 14 EME DIRECTIVE STATEMEN
3. 466 342 e mail sales omega fr Daimlerstrasse 26 D 75392 Deckenpfronn Germany Tel 49 0 7056 9398 0 FAX 49 0 7056 9398 29 Toll Free in Germany 0800 639 7678 e mail info omega de One Omega Drive River Bend Technology Centre Northbank Irlam Manchester M44 5BD United Kingdom Tel 44 0 161 777 6611 FAX 44 0 161 777 6622 Toll Free in United Kingdom 0800 488 488 e mail sales omega co uk It is the policy of OMEGA to comply with all worldwide safety and EMC EMI regulations that apply OMEGA is constantly pursuing certification of its products to the European New Approach Directives OMEGA will add the CE mark to every appropriate device upon certification The information contained in this document is believed to be correct but OMEGA Engineering Inc accepts no liability for any errors it contains and reserves the right to alter specifications without notice WARNING These products are not designed for use in and should not be used for patient connected applications Contents TNTRODUCTION EEN OVER VIE WE e Ee EE EE Ee 1 WHAT SINGEUDED NEE 1 G A R OSETLU EE RS 485 ENABLE Te EE 2 C GEK MODE Se ee ee ee 2 BAUD RATES AND DIVISORS FOR THE DIV1 Mom 3 ADDRESS AND IRO SELECTION ia Sots cee ee hele Heth Ee So i ee Re A eee 4 LINE TERMINATION E 4 INSTALL TION E OPERATING SYSTEM INSTALLATION 54556555 fa ge ga EEN aa ENEE EEN EE GEN E ges 5 WINDOWS O3ONIMPINTI2OOOINKD nean nana t ee
4. ground connection Differential interfaces are typically more immune to noise or voltage spikes that may occur on the communication lines Differential interfaces also have greater drive capabilities that allow for longer cable lengths RS 422 is rated up to 10 Megabits per second and can have cabling 4000 feet long RS 422 also defines driver and receiver electrical characteristics that will allow 1 driver and up to 32 receivers on the line at once RS 422 signal levels range from 0 to 5 volts RS 422 does not define a physical connector RS 485 RS 485 is backwardly compatible with RS 422 however it is optimized for partyline or multi drop applications The output of the RS 422 485 driver is capable of being Active enabled or Tri State disabled This capability allows multiple ports to be connected in a multi drop bus and selectively polled RS 485 allows cable lengths up to 4000 feet and data rates up to 10 Megabits per second The signal levels for RS 485 are the same as those defined by RS 422 RS 485 has electrical characteristics that allow for 32 drivers and 32 receivers to be connected to one line This interface is ideal for multi drop or network environments RS 485 tri state driver not dual state will allow the electrical presence of the driver to be removed from the line Only one driver may be active at a time and the other driver s must be tri stated RS 485 can be cabled in two ways two wire and four wire mode Two wire mode does n
5. Begin by reading through the Troublesooting Guide in Appendix A If assistance is still needed please see below 2 When calling for technical assistance please have your user manual and current adapter settings If possible please have the adapter installed in a computer ready to run diagnostics 3 Omega Engineering maintains a web page on the Internet Our home page address is http www omega com The latest software updates and newest manuals are available via our web site 4 Technical support is available Monday to Friday from 8 30 a m to 6 00 p m eastern time Technical support can be reached at 1 800 DAS IEEE Return Authorization Must Be Obtained From Omega Engineering Before Returned Merchandise Will Be Accepted Authorization Can Be Obtained By Calling Omega Engineering Customer Service And Requesting An Authorized Return AR Number OMG ULTRA 485 PCI Page 10 Appendix C Electrical Interface Appendix C Electrical Interface RS 422 The RS 422 specification defines the electrical characteristics of balanced voltage digital interface circuits RS 422 is a differential interface that defines voltage levels and driver receiver electrical specifications On a differential interface logic levels are defined by the difference in voltage between a pair of outputs or inputs In contrast a single ended interface for example RS 232 defines the logic levels as the difference in voltage between a single signal and a common
6. Name Adds or removes the 120 ohm termination RS 422 RS 485 receiver circuit Receive data only 485 receiver circuit Receive data only Connects the TX to RX for RS 485 two wire operation L Connects the TX to RX for RS 485 two wire operation i 12345 Figure 4 Switch SWI Line Termination OMG ULTRA 485 PCI Page 4 Installation Installation Operating System Installation Windows 95 98 ME NT 2000 XP Do not install the Adapter in the machine until the software has been fully installed 1 Start Windows 2 Insert the software CD in to your CD drive 3 If Auto Start is enabled for this drive the software will automatically launch Otherwise point your browser to the Index bm on the root directory of the CD 4 Select Install Software 5 Select the Part Number for your adapter from the listing 6 Select Windows 98 ME 2000 XP The setup file will automatically detect the operating environment and install the proper components Next depending on the OS version select the Run this program from its current location or Open option Follow the information presented on the screens that follow 7 A screen may appear with the declaration The publisher cannot be determined due to the problems below Authenticode signature not found Please select the Yes button and proceed with the installation This declaration simply means that the Operating System is not aware of th
7. PROCESSING DELAYS The assigned AR number should then be marked on the outside of the return package and on any correspondence The purchaser is responsible for shipping charges freight insurance and proper packaging to prevent breakage in transit FOR WARRANTY RETURNS please have FOR NON WARRANTY REPAIRS consult the following information available BEFORE OMEGA for current repair charges Have the contacting OMEGA following information available BEFORE 1 Purchase Order number under which contacting OMEGA the product was PURCHASED 1 Purchase Order number to cover the 2 Model and serial number of the product COST of the repair under warranty and 2 Model and serial number of the 3 Repair instructions and or specific product and problems relative to the product 3 Repair instructions and or specific problems relative to the product OMEGA Ss policy is to make running changes not model changes whenever an improvement is possible This affords our customers the latest in technology and engineering OMEGA is a registered trademark of OMEGA ENGINEERING INC Copyright 2002 OMEGA ENGINEERING INC All rights reserved This document may not be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form in whole or in part without the prior written consent of OMEGA ENGINEERING INC Where Do I Find Everything Need for Process Measurement and Control OMEGA Of Course Shop online
8. PT THAT OF TITLE AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED LIMITATION OF LIABILITY The remedies of purchaser set forth herein are exclusive and the total liability of OMEGA with respect to this order whether based on contract warranty negligence indemnification strict liability or otherwise shall not exceed the purchase price of the component upon which liability is based In no event shall OMEGA be liable for consequential incidental or special damages CONDITIONS Equipment sold by OMEGA is not intended to be used nor shall it be used 1 as a Basic Component under 10 CFR 21 NRC used in or with any nuclear installation or activity or 2 in medical applications or used on humans Should any Product s be used in or with any nuclear installation or activity medical application used on humans or misused in any way OMEGA assumes no responsibility as set forth in our basic WARRANTY DISCLAIMER language and additionally purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product s in such a manner RETURN REQUESTS INQUIRIES Direct all warranty and repair requests inquiries to the OMEGA Customer Service Department BEFORE RETURNING ANY PRODUCT S TO OMEGA PURCHASER MUST OBTAIN AN AUTHORIZED RETURN AR NUMBER FROM OMEGA S CUSTOMER SERVICE DEPARTMENT IN ORDER TO AVOID
9. S or OS to reassign the resources Make sure the OMG ULTRA 485 PCI adapter is securely installed in a motherboard slot When running DOS or Windows 3 x refer to the supplied software and this User Manual to verify that the adapter is configured correctly This software contains a diagnostic program SSD D software seacom Other DOS DIAG where D the driver letter of your CDROM drive will verify if an adapter is configured properly This diagnostic program is written with the user in mind and is easy to use You can use D software seacom Other DOS PCI FindPCI exe to determine resources that have been assigned to your adapter Make sure that if available the Use Plug n Play option is turned OFF in your BIOS Having this option set to ON in DOS or Windows 3 x will cause erratic operations For Windows95 98 ME NT 2000 the diagnostic tool WinSSD is installed in the SeaCOM folder on the Start Menu during the setup process First find the ports using the Device Manager then use WinSSD to verify that the ports are functional Remember that a loopback test is not possible with the NE switch turned on Always use the diagnostic software when troubleshooting a problem This will eliminate any software issues from the equation OMG ULTRA 485 PCI Page 9 Appendix B How To Get Assistance Appendix B How To Get Assistance Please refer to Troubleshooting Guide prior to calling Technical Support 1
10. T varren eneg si Bora auza sau EE EEN an a EEE Ga ENTENTE 14 Introduction Introduction Overview The OMG ULTRA 485 PCI is a one channel PCI Bus serial UO adapter It provides one field selectable RS 422 485 530 serial port supporting asynchronous data rates up to 460 8K bps Choose the RS 422 mode for long distance device connections up to 4000ft where noise immunity and high data integrity are essential Select RS 485 and capture data from multiple peripherals in a RS 485 multi drop network Up to 31 RS 485 devices can be connected to each port to automate your data collection In RS 485 mode our special auto enable feature allows the RS 485 ports to be viewed by the operating system as a COM port This allows the standard COM driver to be utilized for RS 485 communications Our on board hardware automatically handles the RS 485 driver enable What s Included The OMG ULTRA 485 PCI is shipped with the following items If any of these items is missing or damaged please contact Omega Engineering e OMG ULTRA 485 PCI Serial I O Adapter e Software CD OMG ULTRA 485 PCI Page 1 Card Setup Card Setup RS 485 Enable Modes RS 485 is ideal for multi drop or network environments RS 485 reguires a tri state driver that will allow the electrical presence of the driver to be removed from the line The driver is in a tri state or high impedance condition when this occurs Only one driver may be active at a time and the other driver
11. at www omega com TEMPERATURE 4 Thermocouple RTD amp Thermistor Probes Connectors Panels amp Assemblies DA Wire Thermocouple RTD amp Thermistor lA Calibrators z Ice Point References lA Recorders Controllers amp Process Monitors IP Infrared Pyrometers PRESSURE STRAIN AND FORCE LY Transducers amp Strain Gages DA Load Cells amp Pressure Gages 4 Displacement Transducers LF Instrumentation amp Accessories FLOW LEVEL 4 Rotameters Gas Mass Flowmeters amp Flow Computers A Air Velocity Indicators 4 Turbine Paddlewheel Systems A Totalizers amp Batch Controllers pH CONDUCTIVITY LF pH Electrodes Testers amp Accessories IG Benchtop Laboratory Meters LY Controllers Calibrators Simulators amp Pumps 4 Industrial pH amp Conductivity Equipment DATA ACQUISITION DA Data Acquisition amp Engineering Software 4 Communications Based Acquisition Systems LY Plug in Cards for Apple IBM amp Compatibles IP Datalogging Systems lA Recorders Printers amp Plotters HEATERS 4 Heating Cable 4 Cartridge amp Strip Heaters 4 Immersion amp Band Heaters LY Flexible Heaters 4 Laboratory Heaters ENVIRON MENTAL MONITORING AND CONTROL IG Metering amp Control Instrumentation LF Refractometers IL Pumps amp Tubing lA Air Soil amp Water Monitors A Industrial Water amp Wastewater Treatment 4 pH Conductivity amp Dissolved Oxygen Instruments M4024 1203
12. ate 1200 bps 300 bps 2400 bps 600 bps 4800 bps 1200 bps 9600 bps 2400 bps 19 2K bps 4800 bps 57 6 K bps 14 4K bps 115 2 K bps 28 8K bps 230 4K bps 57 6 K bps 460 8K bps 115 2 K bps If your communications package allows the use of Baud rate divisors choose the appropriate divisor from the following table Choose this Divisor For this Data Rate 1200 bps 384 2400 bps 192 4800 bps 9600 bps 19 2K bps 38 4K bps 57 6K bps 115 2K bps 230 4K bps 460 8K bps Page 3 OMG ULTRA 485 PCI Card Setup Address and IRO selection The OMG ULTRA 485 PCI is automatically assigned resources by your motherboard BIOS Only the I O address may be modified by the user Adding or removing other hardware may change the assignment of I O addresses and IRQs Line Termination Typically each end of the RS 485 bus must have line terminating resistors RS 422 terminates at the receive end only A 120 ohm resistor is across each RS 422 485 input in addition to a 1K ohm pull up pull down combination that biases the receiver inputs Switch SW1 allows customization of this interface to specific requirements Each switch position corresponds to a specific portion of the interface If multiple OMG ULTRA 485 PCI adapters are configured in an RS 485 network only the boards on each end should have switches T P amp P ON Refer to the following table for each position s operation
13. e driver being loaded It will not cause any harm to your system 8 During setup the user may specify installation directories and other preferred configurations This program also adds entries to the system registry that are necessary for specifying the operating parameters for each driver An uninstall option is also included to remove all registry INI file entries from the system Linux Refer to D software seacom Other Linux Linux serial readme where D your CDROM driver letter found on the software CD This file contains valuable information on installing your adapter in the various Linux releases Also in this sub directory is the Linux SerialHOWTO This series of files explains typical Linux serial implementations as well as informing the user to Linux syntax and preferred practices QNX Refer to D software seacom Other QNX6 Install readme where D your CDROM driver letter found on the software CD This file contains valuable information on installing your adapter in the QNX6 Neutrino OS as well as the files required to ensure a flawless implementation Also provided on the software CD are implementation instructions for QNX4 These are found in D software seacom Other QNX4 QNX_COM txt OMG ULTRA 485 PCI Page 5 Installation Physical Installation The adapter can be installed in any 5V PCI expansion slot and contains several jumper straps for each port that must be set for proper Do not install the Adapter in t
14. ginning and end of the serial transmission of the character The data rate and communication parameters for asynchronous communications have to be the same at both the transmitting and receiving ends The communication parameters are baud rate parity number of data bits per character and stop bits i e 9600 N 8 1 OMG ULTRA 485 PCI Page 12 Appendix E Silk Screen Appendix E Silk Screen 2 8 an am m ha wo Ko mm m an an oc m an aD m m x an an oc m gt om Ko oc m ao an oc m Z om an an ES E p E a D E E Zum B Zum 4 9 oo a TINTIN SE III MDT GE nu OMG ULTRA 485 PCI Page 13 Appendix F Compliance Notices Appendix F Compliance Notices Federal Communications Commission Statement FCC This equipment has been tested and found to comply with the limits for Class A digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instruction manual may cause harmful interference to radio communications Operation of this equipment in a residential area is likely to cause harmful interference in such case the user will be required to correct the interference at the use
15. he machine until the software has been fully installed 1 2 3 6 7 Turn off PC power Disconnect the power cord Remove the PC case cover Locate an available PCI slot and remove the blank metal slot cover Gently insert the PCI adapter into the slot Make sure that the adapter is seated properly Replace the screw This is required to ensure FCC Part 15 compliance Replace the cover Connect the power cord Installation is finished OMG ULTRA 485 PCI Page 6 Technical Description Technical Description The OMG ULTRA 485 PCI provides an additional asynchronous serial port field selectable as RS 422 485 530 for industrial automation and control applications The OMG ULTRA 485 PCI utilizes the EXAR 16C850 UART This chip features programmable baud rates data format interrupt control and an industry leading 128 byte FIFOs Connector Pin Assignments RS 422 485 530 Pin Assignments DB 25 Male DTE Signal Name Leg Mode GND Ground eee E TDB TDA Note These assignments meet the EIA TIA ANSI 530 DTE OMG ULTRA 485 PCI Page 7 Specifications Specifications Environmental Specifications Temperature 0 to 70 C 50 to 105 C Range 32 to 158 F 58 to 221 F Humidity Range 10 to 90 R H 10 to 90 R H Non Condensing Non Condensing Manufacturing All Printed Circuit boards are built to UL 94V0 rating and are 100 electrically tested These printed ci
16. ompatibles and PS 2 computers The original PC was equipped with a communication or COM port that was designed around an 8250 Universal Asynchronous Receiver Transmitter UART This device allows asynchronous serial data to be transferred through a simple and straightforward programming interface A start bit followed by a pre defined number of data bits 5 6 7 or 8 defines character boundaries for asynchronous communications The end of the character is defined by the transmission of a pre defined number of stop bits usually 1 1 5 or 2 An extra bit used for error detection is often appended before the stop bits Idle state of Odd Even in 5 to 8 Data Bits d ua See 4 ENER ly D 7 Te Gee eed eee as YA l Le STOP eth E AN ah ey E WA WE 0 WE ke I kis he 2 Figure 5 Asynchronous Communications Bit Diagram This special bit is called the parity bit Parity is a simple method of determining if a data bit has been lost or corrupted during transmission There are several methods for implementing a parity check to guard against data corruption Common methods are called E ven Parity or O dd Parity Sometimes parity is not used to detect errors on the data stream This is refereed to as N o parity Because each bit in asynchronous communications is sent consecutively it is easy to generalize asynchronous communications by stating that each character is wrapped framed by pre defined bits to mark the be
17. on each product If the unit malfunctions it must be returned to the factory for evaluation OMEGA s Customer Service Department will issue an Authorized Return AR number immediately upon phone or written request Upon examination by OMEGA if the unit is found to be defective it will be repaired or replaced at no charge OMEGA s WARRANTY does not apply to defects resulting from any action of the purchaser including but not limited to mishandling improper interfacing operation outside of design limits improper repair or unauthorized modification This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion or current heat moisture or vibra tion improper specification misapplication misuse or other operating conditions outside of OMEGA s control Components which wear are not warranted including but not limited to contact points fuses and triacs OMEGA is pleased to offer suggestions on the use of its various products However OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA either verbal or written OMEGA warrants only that the parts manufactured by it will be as specified and free of defects OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER EXPRESS OR IMPLIED EXCE
18. ot allow for full duplex communication and requires that data be transferred in only one direction at a time For half duplex operation the two transmit pins should be connected to the two receive pins Tx to Rx and Tx to Rx Four wire mode allows full duplex data transfers RS 485 does not define a connector pin out or a set of modem control signals RS 485 does not define a physical connector RS 530 RS 530 a k a EIA 530 compatibility means that RS 422 signal levels are met and the pin out for the DB 25 connector is specified The EIA Electronic Industry Association created the RS 530 specification to detail the pin out and define a full set of modem control signals that can be used for regulating flow control and line status The RS 530 specification defines two types of interface circuits Data Terminal Equipment DTE and Data Circuit Terminating Equipment DCE The OMG ULTRA 485 PCI adapter is a DTE interface OMG ULTRA 485 PCI Page 11 Appendix D Asynchronous Communications Appendix D Asynchronous Communications Serial data communications implies that individual bits of a character are transmitted consecutively to a receiver that assembles the bits back into a character Data rate error checking handshaking and character framing start stop bits are pre defined and must correspond at both the transmitting and receiving ends Asynchronous communications is the standard means of serial data communication for PC c
19. rcuit boards are solder mask over bare copper or solder mask over tin nickel Power Consumption Supply line 5 VDC 480 mA Physical Dimensions Board length 4 9 inches 12 446 cm Board Height including Goldfingers 2 80 inches 7 112 cm Board Height excluding Goldfingers 2 475 inches 6 287cm OMG ULTRA 485 PCI Page 8 Appendix A Troubleshooting Appendix A Troubleshooting Software is supplied with the OMG ULTRA 485 PCI adapter and may be used in the troubleshooting procedures Using this software and following these simple steps can eliminate most common problems without the need to call Technical Support 1 Identify all D adapters currently installed in your system This includes your on board serial ports controller cards sound cards etc The D addresses used by these adapters as well as the IRO if any should be identified Configure your OMG ULTRA 485 PCI adapter so that there is no conflict with currently installed adapters No two adapters can occupy the same I O address Make sure the OMG ULTRA 485 PCI adapter is using a unique IRQ While the adapter does allow the sharing of IRQs many other adapters i e SCSI adapters amp on board serial ports do not The IRQ is typically selected by the BIOS or Operating system Some BIOS setup software will allow changing the IRQ but others do not Another method of changing assigned resources is to try changing PCI slots This will typically cause the BIO
20. re can handle echoing i e using received characters to throttle the transmitter or it can confuse the system if the software does not To select the No Echo mode select silk screen position NE Clock Modes The OMG ULTRA 485 PCI employs a unique clocking option that allows the end user to select from divide by 4 and divide by 1 clocking modes SW2 positions 1 and 2 select the Divide by 1 silk screen D1 and Divide by 4 silk screen D4 modes To select the Baud rates commonly associated with COM ports i e 2400 4800 9600 19 2 115 2K Bps set switch SW2 in the divide by 4 mode silk screen D4 To select the maximum data rate up to 460 8K bps set switch SW2 in the divide by 1 silk screen D1 position Please refer to the following page for these additional data rates Caution Do not set both switches on or invalid clocking will occur RS 485 Mode and Clock Mode Examples Switch SW2 DDARN 14TTE Figure l Switch SW2 RS 422 Divide by 4 OMG ULTRA 485 PCI Page 2 Card Setup DDARN 14TTE Figure 2 Switch SW2 RS 485 Auto Enabled with No Echo Divide by 4 DDARN 14 TTE Figure 3 Switch SW2 RS 485 Auto Enabled with Echo Divide by 4 Baud Rates and Divisors for the Divl mode The following table shows some common data rates and the rates you should choose to match them if using the adapter in the Div1 mode Choose this Data Rate For this Data R
21. rs expense EMC Directive Statement C Products bearing the CE Label fulfill the requirements of the EMC directive 89 336 EEC and of the low voltage directive 73 23 EEC issued by the European Commission To obey these directives the following European standards must be met EN55022 Class A Limits and methods of measurement of radio interference characteristics of information technology equipment EN55024 Information technology equipment Immunity characteristics Limits and methods of measurement EN60950 IEC950 Safety of information technology equipment including electrical business equipment Warning This is a Class A Product In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures to prevent or correct the interference Always use cabling provided with this product if possible If no cable is provided or if an alternate cable is required use high quality shielded cabling to maintain compliance with FCC EMC directives OMG ULTRA 485 PCI Page 14 WARRANTY DISCLAIMER OMEGA ENGINEERING INC warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase OMEGA s Warranty adds an additional one 1 month grace period to the normal one 1 year product warranty to cover handling and shipping time This ensures that OMEGA s customers receive makimum coverage
22. s must be tri stated The output modem control signal Request To Send RTS is typically used to control the state of the driver Some communication software packages refer to RS 485 as RTS enable or RTS block mode transfer One of the unique features of the OMG ULTRA 485 PCI is the ability to be RS 485 compatible without the need for special software or drivers This ability is especially useful in Windows and OS 2 environments where the lower level I O control is abstracted from the application program This ability means that the user can effectively use the OMG ULTRA 485 PCI in an RS 485 application with existing i e standard RS 232 software drivers Switch SW2 is used to control the RS 485 mode functions for the driver circuit The selections are Auto enable silk screen AT The Auto enable feature automatically enables disables the RS 485 interface via on board circuitry RTS enable silk screen RT The RTS mode uses the RTS modem control signal to enable the RS 485 interface and provides backward compatibility with existing software products No Echo silk screen NE is used to control the RS 485 enable disable functions for the receiver circuit and determine the state of the RS 422 485 driver The RS 485 Echo is the result of connecting the receiver inputs to the transmitter outputs Every time a character is transmitted it is also received This can be beneficial if the softwa
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