Omega Engineering RS-422/485 Network Router User Manual
Contents
1. Card Setup The OMG ULTRA COMMA422 contains several jumper straps which must be set for proper operation Address Selection Each port on the OMG ULTRA COMM422 occupies eight consecutive I O locations A DIP switch is used to set the base address for these locations The OMG ULTRA COMM422 has a unique addressing scheme that allows it to be completely compatible with older four port RS 422 485 interface adapter p n 3067 and provide for the ability to select address combinations more commonly used The first addressing scheme allows the OMG ULTRA COMM422 to select the addresses for its ports from a table of available address combinations The following table shows the addressing combinations available If different address combinations are required please contact Technical Support about a custom PAL option 6 7 8 1 2 3 4 On On ofr ars 288 Ses 268 O tor for m R 20 288 On Jon 50 sog so sis oi for off so 588 o off of on 1500 1508 isio sis ot Jor Jor 320 3228 420 428 On Jon Jon Addresses setup by switches 1 5 Figure 1 Available Address Combinations Note Each COM port in the system should have a unique address Typically COMI COMA addresses are 3F8 2F8 3E8 and 2E8 Hex Refer to Appendix A for common address contentions OMG ULTRA COMM422 Page 2 Card Setup The second mode of address selection provides the compatibility mode In this2. 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 COMMA422 in an RS 485 application with existing i e standard RS 232 software drivers Headers JID through J4D are used to control the RS 485 mode functions for the driver circuit The selections are RTS enable silk screen RT or Auto enable silk screen AT The Auto enable feature automatically enables disables the RS 485 interface The RTS mode uses the RTS modem control signal to enable the RS 485 interface and provides backward compatibility with existing software products Position 3 silk screen NE of J1D through J4D 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 software 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 For R 422 530 449 compatibility remove the jumpers at JID through J4D Examples on the following pages describe all of the valid settings for JID JAD OMG ULTRA COMM422 Page 6 Card
3. mode the DIP switch sets the base address and the adapter occupies 32 consecutive I O locations The following table illustrates the location of each port and its relationship to the other ports Note For switches 1 5 to become active switches 6 7 amp 8 must be set in the On or Up position Switch Settings Address lines gt Address Selected 280 29F 380 39F 1A0 1BF 2E0 2FF Figure 2 Address Selection Table EE AE AR EIE 5 The following illustration shows the correlation between the DIP switch setting and the address bits used to determine the base address In the example below address 2E0 is selected as a base Address 2E0 in binary is XX 10 111X XXXX where X a non selectable address bit A9 A5 ON OFF 12345678 Example Base 2E0 2E0 2E7 a a Baseraa 2F82FF Figure 3 Portto Connector Table OMG ULTRA COMM422 Page 3 Card Setup Jumper Selections For ease of configuration the headers are grouped by port Port one headers have a Jl prefix Port two headers have the J2 prefix etc For example the header that controls the Port one IRQ selection is J1B the header that controls the Port 2 IRO selection is J2B The silk screen also provides information for configuring the adapter without the use of the manual This is particularly useful in field re configuration IRO Selection Headers JIB through J4B select the interrupt request for each serial por
4. APPENDIX C ELECTRICAL INTERFACE oues esse essees soes sees sees see 22 APPENDIX D ASYNCHRONOUS COMMUNICATIONS cccccce 23 APPENDIX E SILK SCREEN ses sesse ss ss ss ss ss ss ss se se se se se ss se se se se se D4 APPENDIX F COMPLIANCE NOTICES eee sees esse esse es sees sees sees see 25 FEDERAL COMMUNICATIONS COMMISSION STATEMENT 25 EMC DIRECTIVE STATEMENT esse sesse see se see ee se sees ee ese ee ee ee dee ee ee 25 Figures Figure 1 Available Address Combinations eensesesencasesenensososenensasasos Figure 2 Address Selection Table scrsesesenescosesenensesesensasesenensososenensasasos Figure 3 Port to Connector Table Figure 4 Header J1A Normal IRQ Mode Figure 5 Header J1A amp J2A Shared IRQ Mode Figure 6 Headers JID J4D RS 422 e sssesecsecssoescoscoscossosssessesesoosoossoseossosssese Figure 7 Headers J1D J4D RS 485 Auto Enabled with No Echo 7 Figure 8 Headers J1D J4D RS 485 Auto Enabled with Echo 7 Figure 9 Headers J1D J4D RS 485 RTS Enabled with No Echo 8 Figure 10 Headers J1D J4D RS 485 RTS Enabled with Echo 8 Figure 11 Headers JIE J4E Line Termination ssssssssee 9 Figure 12 Clocking Mode Divide By 4 Figure 13 Clocking Mode Divide By 2 Figure 14 Clocking Mode Div
5. 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 his own expense EMC Directive Statement 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 nterference characteristics of information technology eguipment Hie ENS5024 Information technology eguipment 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 Always use cabling provided with this product if possible If no cabl
6. identical so any one of the four can be read Example This indicates that Channel 2 has an interrupt pending Bit Position 7 6 5 4 3 2 1 0 Value Read 0 10 10 0 10 0 1 0 OMG ULTRA COMM422 Page 16 Technical Description Connector Pin Assignments DB 9 Pin Assignments CTS Clear To Send Positive 9 input CTS Clear To Send Negative 8 Input RISE e Sp 9 Ed iets e e E OMG ULTRA COMM422 Page 17 Specifications Specifications Environmental Specifications Temperature Range 0 to 50 C 20 to 70 C 32 to 122 F 4 to 158 F Humidity Range 10 to 90 R H 10 to 90 R H Non Condensing Non Condensing Manufacturing e IPC 610 A Class III standards are adhered to with a 0 1 visual A Q L and 100 Functional Testing e All Printed Circuit boards are built to U L 94VO rating and are 100 electrically tested These printed circuit boards are solder mask over bare copper or solder mask over tin nickel Power Consumption Supply line 3440 Rating 3441 Rating 570 mA Mean Time Between Failures MTBF Greater than 150 000 hours Calculated Physical Dimensions Board length 8 0 inches 20 32 cm Board Height including Goldfingers 4 2 inches 10 66 cm Board Height excluding Goldfingers 3 9 inches 9 91 cm OMG ULTRA COMM422 Page 18 Appendix A Troubleshooting Appendix A Troubleshooting A Serial Utility Diskette is supplied with the ada
7. 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 I Need for Process Measurement and Control OMEGA Of Course Shop online at www omega com TEMPERATURE Pd Thermocouple RTD amp Thermistor Probes Connectors Panels amp Assemblies 4 Wire Thermocouple RTD amp Thermistor A Calibrators amp Ice Point References A Recorders Controllers amp Process Monitors 4 Infrared Pyrometers PRESSURE STRAIN AND FORCE 4 Transducers amp Strain Gages A Load Cells amp Pressure Gages 4 Displacement Transducers A Instrumentation amp Accessories FLOW LEVEL 4 Rotameters Gas Mass Flowmeters amp Flow Computers WF Air Velocity Indicators A Turbine Paddlewheel Systems A Totalizers amp Batch Controllers pH CONDUCTIVITY pH Electrodes Testers amp Accessories 4 Benchtop Laboratory Meters 4 Controllers Calibrators Simulators amp Pumps 4 Industrial pH amp Conductivity Equipment DATA ACQUISITION A Data Acquisition amp Engineering Software 4 Communications Based Acquisition Systems 4 Plug in Cards for
8. 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 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 the FOR NON WARRANTY REPAIRS consult OMEGA following information available BEFORE for current repair charges Have the following contacting OMEGA information available BEFORE contacting OMEGA 1 Purchase Order number under which the product 1 Purchase Order number to cover the COST was PURCHASED of the repair 2 Model and serial number of the product under 2 Model and serial number of the product and warranty and 3 Repair instructions and or specific problems 3 Repair instructions and or specific problems relative to the product relative to the product OMEGA s policy is to make running changes not model changes whenever an improvement
9. 0 466 342 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 OVERVIEW GE Ee eksin cas Ba as sib os Epa eae e See 1 WHAT SINC UDE D sss azad ee We se e ya 1 FACTORY DEFAULT SETTINGS esse sesse see se e a e ee en ee 1 ADDRESS SELECTION ii esel etes ee eg se ar be sa S R 2 JUMPER SELECTION Seran Ge Re YA Z N sass GR Gee Ee ee aa 4 IRO Selections icc amal am n l ke 4 INTERRUPT MODES sie li als Sally l 5 RS 485ENABLEMODES er 6 mterfaceModeExamplesJID J4
10. Apple IBM amp Compatibles 4 Datalogging Systems A Recorders Printers amp Plotters HEATERS 4 Heating Cable IX Cartridge amp Strip Heaters 4 Immersion amp Band Heaters WF Flexible Heaters 4 Laboratory Heaters ENVIRONMENTAL MONITORING AND CONTROL 4 Metering amp Control Instrumentation 4 Refractometers 4 Pumps amp Tubing A Air Soil amp Water Monitors A Industrial Water amp Wastewater Treatment H pH Conductivity amp Dissolved Oxygen Instruments M3184 0303
11. D 7 Interface Mode Examples JID J4D continued 8 LINE TERMINATION sese sys als alan dalla dar 9 CLOCK MODES lll Ge Ee ee ee be se sad oro se 10 BAUD RATES AND DIVISORS FOR THE DIV MODE 11 BAUD RATES AND DIVISORS FOR THE DIV2 MODE 12 INSTALLATION sesse ekke ae ie eed soe ese bee ae oe Rod de eg oe en Ge ese OPERATINGSYSTEM NSTALLATION 13 ForWindowsUsers e 13 Other Operating Systems eee 13 FEATURES EE ed oe EE liken silmeye mamas sallan Soyaslan 14 INTERRUPTS EA E S L N isle 15 WHY USE AN ISP ini la ge ed ee lk a 16 CONNECTORPINASSIGNMENTS 17 DB 9PinAssignments Ge ee Ge ee ee Gee 17 DB 37ConnectorPinAssignments 17 ENVIRONMENTAL SPEC FICATIONS ese ee ee ee ee ee ee 18 MANUFACTURING iss see cela dese Gee NN SN eek ie d0bses Se ee Rek ee Gee 18 POWER CONSUMPTION 0 18 MEAN TIME BETWEEN FAILLURES MTBP 18 PHYSICALDIMENSIONS RA RR ee AR ee 18 APPENDIX A TROUBLESHOOTING ssseeesesesss s s sees 19 APPENDIX B HOW TO GET ASSISTANCEERROR BOOKMARK NOT DEFINED
12. 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 beginning 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 ie 9600 N 8 1 OMG ULTRA COMM422 Page 23 Appendix E Silk Screen Appendix E Silk Screen 4 2 ss om i e O TT ve deu ew ma Em EET EN TT a Ed Eau ar e MAREJ RRS O vaoz Qu CZY NNOS VALIN vlMOd 05591 wa 28 IRERE 8 0 EINOd 05594 Zd c ZAZA wsm i n im 3 9 Page 24 OMG ULTRA COMM422 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
13. Setup Interface Mode Examples JID J4D O o ATOM NE O NN Pa Figure 6 Headers JID J4D RS 422 0 o HE NE N EE lt p Figure 7 Headers JID J4D RS 485 Auto Enabled with No Echo Figure 8 Headers JID J4D RS 485 Auto Enabled with Echo OMG ULTRA COMM422 Page 7 Card Setup Interface Mode Examples JID J4D continued l ae Figure 9 Headers J1D J4D RS 485 RTS Enabled with No Echo a a O O RE Er Figure 10 Headers JID J4D RS 485 RTS Enabled with Echo OMG ULTRA COMMA22 Page 8 Card Setup 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 530 422 485 input in addition to a IK ohm pull up pull down combination that bias the receiver inputs Headers J1E through J4E allow the user to customize this interface to their specific requirements Each jumper position corresponds to a specific portion of the interface If multiple OMG ULTRA COMM422 adapters are configured in an RS 485 network only the boards on each end should have jumpers T P amp P ON Refer to the following table for each position s operation Name Function RAE ad RS 422 RS 485 receiver circuit Receive data only u o an 485 receiver circuit Receive data only Adds or removes the 120 ohm termination Connects the TX
14. Users Guide E www omega com e mail info omega com OMG ULTRACOMM422 Automatic Four Port ISA RS 422 485 Interface Board OMEGAnet Online Service Internet e mail www omega com info omega com USA ISO 9001 Certified Canada Servicing North America One Omega Drive P O 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 Canada 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 Frystatska 184 733 01 Karvin Czech Republic TEL 420 0 59 6311899 FAX 420 0 59 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 080
15. ct 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 EXCEPT THAT OFTITLE 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
16. d Setup Baud Rates and Divisors for the Div2 mode The following table shows some common data rates and the rates you should choose to match them if using the adapter in the Div2 mode If your communications package allows the use of Baud rate divisors choose the appropriate divisor from the following table 192 NE ZT TT SEN EN I GE 8 OMG ULTRA COMM422 Page 12 Installation Installation The OMG ULTRA COMM422 can be installed in any of the PC expansion slots The OMG ULTRA COMM422 contains several jumper straps for each port that must be set for proper operation Turn off PC power Disconnect the power cord Remove the PC case cover Locate an available slot and remove the blank metal slot cover Gently insert the OMG ULTRA COMM422 into the slot Make sure that the adapter is seated properly Replace the screw Install the Spider Cable Replace the cover Connect the power cord ONS ARM Installation is complete Operating System Installation For Windows Users Start by choosing Install Software at the beginning of the CD Choose Asynchronous COM Port Software SeaCOM Other Operating Systems Refer to the appropriate section of the Serial Utilities Software OMG ULTRA COMMA22 Page 13 Technical Description Technical Description The OMG ULTRA COMM422 utilizes the 16550 UART This chip features programmable baud rates data format interrupt control and a 16 byte
17. e for use This made the IRQ a very valuable system resource To make the maximum use of these system resources an IRQ sharing circuit was devised that allowed more than one port to use a selected IRQ This worked fine as a hardware solution but presented the software designer with a challenge to identify the source of the interrupt The software designer frequently used a technique referred to as round robin polling This method required the interrupt service routine to poll or interrogate each UART as to it s interrupt pending status This method of polling was sufficient for use with slower speed communications but as modems increased their through put abilities this method of servicing shared IRQs became inefficient OMG ULTRA COMM422 Page 15 Technical Description Why use an ISP The answer to the polling inefficiency was the Interrupt Status Port ISP The ISP is a read only 8 bit register that sets a corresponding bit when an interrupt is pending Port 1 interrupt line corresponds with Bit DO of the status port Port 2 with DI etc The use of this port means that the software designer now only has to poll a single port to determine if an interrupt is pending The ISP is at Base 7 on each port Example Base 280 Hex Status Port 287 28F etc The OMG ULTRA COMM422 will allow any one of the available locations to be read to obtain the value in the status register All four status ports on the OMG ULTRA COMM422 are
18. e is provided or if an alternate cable is required use high quality shielded cabling to maintain compliance with FCC EMC directives OMG ULTRA COMM422 Page 25 BE 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 maximum coverage 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 includ ing 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 vibration improper specification misapplication misuse or other operating conditions outside of OMEGA s control Components which wear are not warranted including but not limited to conta
19. eceiver 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 not 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 con
20. ide By 1 Figure 15 Asynchronous Communications Bit Diagram Introduction Introduction Overview The OMG ULTRA COMM422 provides the PC with four additional RS 422 485 serial ports for terminals modems printers etc The unique feature of the OMG ULTRA COMM422 is the ability to be RS 485 compatible without the need for special software or drivers This ability is especially useful in Windows Windows NT 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 COMMA422 in an RS 485 application with existing i e standard RS 232 software drivers Note The Auto Enable feature is not available on the p n 3441 What s Included The OMG ULTRA COMM422 is shipped with the following items If any of these items are missing or damaged contact the supplier e OMG ULTRA COMM422 Serial I O Adapter e DB 37 to four DB 9 Spider Cable e Software Factory Default Settings The OMG ULTRA COMM422 factory default settings are as follows Base Address IRQ Electrical Specification 280 RS 422 288 RS 422 298 RS 422 To install the OMG ULTRA COMM422 using factory default settings refer to Installation on page 13 For your reference record installed OMG ULTRA COMM422 settings below Base Address IRQ Electrical Specification Port 1 Port 2 Port 3 Port 4 OMG ULTRA COMM422 Page 1 Card Setup
21. in the Omega Engineering 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 Always use the diagnostic software when troubleshooting a problem This will eliminate any software issues from the equation OMG ULTRA COMM422 Page 19 Appendix A Troubleshooting 8 Thefollowing are known VO conflicts The 278 and 378 settings may conflict with your printer VO adapter 3B0 cannot be used if a Monochrome adapter is installed 3F8 3FF is typically reserved for COMI 2F8 2FF is typically reserved for COM2 3E8 3EF is typically reserved for COM3 2E8 2EF is typically reserved for COMA 9 Please refer to your included diskette for any post production manual updates and application specific information 10 Always use the diagnostic software when Troubleshooting a problem This will eliminate the software issue from the equation OMG ULTRA COMM422 Page 20 Appendix B How To Get Assistance Please refer to Troubleshooting Guide prior to calling Technical Support 1 Begin byreading through the Trouble Shooting 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 Home page on the Inter
22. input and output FIFO Also available as options are the Startech 16C650 and the Texas Instruments 16C750 UARTS that provide deeper FIFOs 32 bytes and enhanced clocking features A second version of the OMG ULTRA COMM422 p n 3441 is available without the auto enable feature for a reduced price If point to point RS 422 or RTS enabled RS 485 operations are desired this option should be considered Features e Automatic RS 485 driver enable disable allows card to appear to be RS 232 requiring no additional drivers PAL option allows for unique OEM address selection Shareable IRQs allow more than one port to share a single IRQ IRQs 2 9 7 10 11 12 15 supported 16550 buffered UARTS standard 16650 and 16750 UARTS available 16 Bit address decode allows for easier integration Speeds up to 460 8 K bps available Multiple clocking modes insuring compatibility with existing software products Modem Control Signal Considerations Some software packages require the use of the modem handshake signals such as RTS or CTS Refer to your application software manual to determine the requirements for modem control signals If no requirements are mentioned a safe configuration is to tie RTS to CTS This configuration will typically satisfy the modem control signal requirements for most communications software OMG ULTRA COMM422 Page 14 Technical Description Interrupts A good description of an interrupt and it s importance to
23. net Our home page address is www omega com The latest software updates and newest manuals are available via our FTP site that can be accessed from our home page 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 BEFORE RETURNED MERCHANDISE WILL BE ACCEPTED AUTHORIZATION CAN BE OBTAINED BY CALLING OMEGA CUSTOMER SERVICE AND REOUESTING AN AUTHORIZED RETURN AR NUMBER OMG ULTRA COMMA22 Page 21 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 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 r
24. ovides the pull down resistor circuit that makes sharing IRQs possible If you are using more than one OMG ULTRA COMM422 or a compatible adapter in a bus you should only have one port set to M The following example shows two ports sharing a single IRQ JIA O EE O NSM PAD O MM NSM Figure 5 Header JIA amp J2A Shared IRQ Mode Set the jumper to S if you are using more than one OMG ULTRA COMM422 in a bus or to completely remove the pull down resistor for hardware compatibility Setting the adapter in this configuration when it is not accompanied by a pull down resistor will prevent the ports from triggering an interrupt OMG ULTRA COMM422 Page 5 Card Setup RS 485 Enable Modes RS 485 is ideal for multi drop or network environments RS 485 reguires a tri state driver not dual state 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 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 COMM422 is the ability to be RS 485 compatible without the need for special software or drivers This ability is especially useful in Windows Windows NT
25. pter and will be used in the troubleshooting procedures By using this diskette and following these simple steps most common problems can be eliminated 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 adapter so that there is no conflict with currently installed adapters No two adapters can occupy the same O address Make sure the adapter is using a unigue IRO While the adapter does allow the sharing of IROs many other adapters i e SCSI adapters amp on board serial ports do not The IRO is typically selected via an on board header block Refer to the section on Card Setup for help in choosing a I O address and IRO Make sure the adapter is securely installed in a motherboard slot When running DOS or Windows 3 x refer to the Serial Utilities disk 1 and the User Manual to verify that the adapter is configured correctly The supplied diskette contains a diagnostic program SSD that will verify if an adapter is configured properly This diagnostic program is written with the user in mind and is easy to use Refer to the README file on the supplied diskette for detailed instructions on using SSD For Windows 95 and Windows NT the diagnostic tool WinSSD is installed
26. t If COMI is selected the corresponding jumper must be on the IRQ4 setting If COM2 is selected the corresponding jumper must be on IRQ3 E E 5 7 910111215 Figure 4 Headers JIB J4B IRO Selection Note Most communications software applications default COM3 to IRQ4 and COMA to IRQ3 This requires the sharing of interrupts between COMI and COM3 and between COM2 and COM4 While this is the default it is not always the preferred setting Check your software configuration instructions to determine the most appropriate IRQ selection Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting and setting the appropriate selections at JIA through J4A Consult your particular software for IRQ selection If no interrupt is desired remove the jumper OMG ULTRA COMM422 Page 4 Card Setup Interrupt Modes Headers JIA through J4A select the interrupt modes for each port Each port must be set in the correct mode to insure proper operation N indicates the N ormal single interrupt per port mode S Indicates the S hared interrupt mode which allows more than one port to access a single IRQ M indicates the inclusion of a IK ohm pull down resistor required on one port when sharing interrupts JA 2 CI NSM Figure 4 Header JIA Normal IRQ Mode Set the jumpers to S for shared interrupt mode on all blocks sharing an IRQ except one Set that port block for M This pr
27. the IBM PC can be found in the book Peter Norton s Inside the PC Premier Edition One of the key things that makes a computer different from any other kind of man made machine is that computers have the capability to respond to the unpredictable variety of work that comes to them The key to this capability is a feature known as interrupts The interrupt feature enables the computer to suspend whatever it is doing and switch to something else in response to an interruption such as the press of a key on the keyboard A good analogy of a PC interrupt would be the phone ringing The phone bell is a request for us to stop what we are currently doing and take up another task speak to the person on the other end of the line This is the same process the PC uses to alert the CPU that a task must be preformed The CPU upon receiving an interrupt makes a record of what the processor was doing at the time and stores this information on the stack this allows the processor to resume its predefined duties after the interrupt is handled exactly where it left off Every main sub system in the PC has it s own interrupt frequently called an IRQ short for Interrupt ReQuest In these early days of PC s it was decided that the ability to share IRQs was an important feature for any add in I O card Consider that in the IBM XT the available IRQs were IRQO through IRQ7 Of these interrupts only IRQ2 5 and IRQ7 were actually availabl
28. to RX for RS 485 two wire operation Connects the TX to RX for RS 485 two wire operation Figure 11 Headers JIE J4E Line Termination OMG ULTRA COMM422 Page 9 Card Setup Clock Modes The OMG ULTRA COMM422 employs a unigue clocking option that allows the end user to select from divide by 4 divide by 2 and divide by 1 clocking modes These modes are selected at Headers J1C through JAC To select the Baud rates commonly associated with COM ports i e 2400 4800 9600 19 2 115 2K Bps place the jumper in the divide by 4 mode silk screen DIV oo oo LD DIV1 DIV2 DIV4 Figure 12 Clocking Mode Divide By 4 To double these rates up to a maximum rate for 230 4K bps place the jumper in the divide by 2 silk screen DIV2 position DIV DIV2 DIV Figure 13 Clocking Mode Divide By 2 To select the maximum data rate 460 8K bps place the jumper in the divide by 1 silk screen DIV1 position DIV1 NE DIV2 0 0 DIV4 0 O Figure 14 Clocking Mode Divide By 1 OMG ULTRA COMM422 Page 10 Card Setup Baud Rates and Divisors for the Div1 mode The following table shows some common data rates and the rates you should choose to match them if using the adapter in the Div 1 mode If your communications package allows the use of Baud rate divisors choose the appropriate divisor from the following table 4800 bps HT KN bps OMG ULTRA COMM422 Page 11 Car
29. trol signals RS 485 does not define a physical connector OMG ULTRA COMM422 Page 22 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 compatibles 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 Character boundaries for asynchronous communications are defined by a starting bit followed by a pre defined number of data bits 5 6 7 or 8 The end of the character is defined by the transmission of a pre defined number of stop bits usual 1 1 5 or 2 An extra bit used for error detection is often appended before the stop bits Idle state of Odd Even line E Sto8DataBits ej PRE Femen eer i b Ai iy os Wer Stee anne Ta l l 1 Ver ISO 0 Seka eke I l es ei 1 5 ke 2 aj Figure 15 Asynchronous Communications Bit
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