SeaLINK+485I USER MANUAL
Contents
1. menu under Programs SeaCOM group Sealevel Systems SeaLINK 4851 Page 5 Configuration Configuration Electrical Interface Selection The port on the SeaLINK 485I has the ability to be used in both half and full duplex RS 422 485 applications This is selectable through DIP switch SW 1 The chart below describes each of the switch position s function Please refer to the following page for switch setting examples Switch SWI in the ON position either enables adds or connects based on the function of the switch position listed below Switch SWI position OFF disables removes or disconnects i Adds or removes the 1K ohm pull up resistor in the Adds or removes the 1K ohm pull down resistor in the RS 422 RS 485 receiver circuit Receive data only Connects the TX to RX for RS 485 two wire operation Connects the TX to RX for RS 485 two wire operation A RS 422 RS 485 receiver circuit Receive data only Sealevel Systems SeaLINK 4851 Page 6 Configuration Switch Examples Please use the following examples to configure your adapter RS 422 Figure 1 RS 422 4 Wire RS 485 Default RS 485 Figure 2 RS 485 2 Wire with Echo ON RS 485 MM 12 34 5 6 7 8 Figure 3 RS 485 2 Wire No Echo Sealevel Systems SeaLINK 4851 Page 7 Technical Description Technical Description The SeaLINK 485I utilizes a USB UART This chip features programmable baud rate data format2. 128 byte Dual Port TX Buffer and 384 byte Dual Port RX Buffer The RS 422 485 transceiver supports data rates up to 921 6K baud Features e Hot Pluggable device e Does not require opening the case e No system resources are required i e I O ports or IRQ s e LED status indicators for USB Enabled TD and RD Connector Pin Assignments DB25 Male The SeaLINK 4851 complies with the EIA 530 pin out with the following signals supported Signal Name Pin Mode GND Ground 7 RX RDA Technical Note The modem control signals are biased as follows RTS is connected to CTS DTR is connected to DCD and DSR and RI is tied inactive Sealevel Systems SeaLINK 4851 Page 8 Specifications Specifications Environmental Specifications Temperature 0 to 50 C 20 to 70 C Range 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 All Sealevel Systems Printed Circuit boards are built to UL 94V0 rating and are 100 electrically tested These printed circuit boards are solder mask over bare copper or solder mask over tin nickel Power Consumption Supplyline 5VDC 100mAa Mean Time Between Failures MTBF Greater than 150 000 hours Calculated Physical Dimensions Package Length 3 8 inches 9 66 cm Package Width 2 3 inches 5 84 cm Package Height 1 0 inches 2 54
3. RCHANDISE WILL BE ACCEPTED AUTHORIZATION CAN BE OBTAINED BY CALLING SEALEVEL SYSTEMS AND REQUESTING A RETURN MERCHANDISE AUTHORIZATION RMA NUMBER Sealevel Systems Incorporated 155 Technology Place P O Box 830 Liberty SC 29657 USA 864 843 4343 FAX 864 843 3067 www sealevel com email support sealevel com Technical Support is available from 8 a m to 5 p m Eastern time Monday Friday Trademarks Sealevel Systems Incorporated acknowledges that all trademarks referenced in this manual are the service mark trademark or registered trademark of the respective company SeaLINK 4851 is a trademark of Sealevel Systems Incorporated Sealevel Systems SeaLINK 4851 Page 17
4. ROUND LOOP eee eee eee nana eee 13 CABLING RECOMMENDATIONS ceea 13 APPENDIX E ASYNCHRONOUS COMMUNICATIONS 14 APPENDIX F SILK SCREEN oooooooooooooooooooooooooooooooooooooooo L5 APPENDIX G COMPLIANCE NOTICES oocoocooooooooooooo 10 FEDERAL COMMUNICATIONS COMMISSION STATEMENT 16 EMC DIRECTIVE STATEMENT oo enakan 16 INDIA dace NB ASN LN BNN BNI Figures Figure 1 RS 422 4 Wire RS 485 Default Figure 2 RS 485 2 Wire with Echo Figure 3 RS 485 2 Wire No Echo ocoocooooooooooooooooooooooooooo Figure 4 SeaLINK 4851 cabling example Figure 5 Asynchronous Communications Bit Diagram 14 O 2002c Sealevel Systems Incorporated All rights reserved Introduction Introduction Overview The Sealevel Systems SeaLINK 485I equips the PC with 1 isolated USB to RS 422 485 Asynchronous serial port providing a versatile interface for common RS 422 485 needs The SeaLINK 485I connects through the PC s external USB port so it does not require opening the computer case Resources such as IRQ s and I O addresses are also not utilized It does require a system that supports USB in hardware and operating system What s Included The SeaLINK 4851 is shipped with the following items If any of these items is missing or damaged contact the supplier e SeaLINK 485 I Isolated USB to RS 422 485 Serial I O Adapter e USB Cable Part Number CA179 for Connecting to U
5. SEALEVEL SYSTEMS INCORPORATED SeaLINK 4851 USER MANUAL Part 2104 Sealevel e bo Inc Phone 864 843 4343 A a ace FAX 864 843 3067 ox J www sealevel Liberty SC 29657 USA i ia Contents INTRODUCTION sciissssscsscssecdicsosasdesseseesssoesescesessvacessesescossessesesoese OVER VIE Waah ara ana ies Bt d tia Sess Mees 1 WPAT S INGGUDED taninos 1 INSTALLATION pir sisisnbini en saban OPERATING SYSTEM INSTALLATION ccccccccccccecccsesescecsceseeesseeeses 2 SYSTEM INSTALLATION ovis den adi d anakku deasa tan cutia gta 2 CONFIGURATION ns cc ad s ca ca catea ca oa oaia anakan O ELECTRICAL INTERFACE SELECTION eee 6 SWIICHEXAMPLES spec a eat e dial a i cl ca d au 7 TECHNICAL DESCRIPTION ooooooooooooooooooog FEATURES sn Ke coala ii al 8 CONNECTOR PIN ASSIGNMENTS DB25 MALE 8 SPECIFICATIONS ceno cae cca ANN BN an ENVIRONMENTAL SPECIFICATIONS ccccccsessscecseseeecsseeeeessseeeeessaes 9 MANUFACTURING ccscsssceceessececseccecessseeecesaeeecseseeeecseeeeessseeeceenaes 9 POWER CONSUMPTION oo oo nenen anna 9 MEAN TIME BETWEEN FAILURES MTBF woo eee 9 PHYSICAL DIMENSIONS oroetan d ta nina 9 APPENDIX A TROUBLESHOOTING e oocooooooooooooooooo 10 APPENDIX B HOW TO GET ASSISTANCE ooooooooooooooo L APPENDIX C ELECTRICAL INTERFACE cccccsscccsccssecsseees 12 RS 2422 en me c ci la 12 ROA GO te iza or i ee ee 12 APPENDIX D GROUND LOOP PHENOMENON oo 13 WHAT IS G
6. application Please note that if the card is configured for 2 wire RS 485 with no echo a loopback test is not possible The receiver in this case will be turned off and the test will fail If you plan on using this device in two wire mode test the adapter in RS 422 mode first Then configure the adapter for your application Sealevel Systems SeaLINK 4851 Page 10 Appendix B How To Get Assistance Appendix B How To Get Assistance Please refer to Appendix A Troubleshooting prior to calling Technical Support 1 Read this manual thoroughly before attempting to install the adapter in your system 2 When calling for technical assistance please have your user manual and current adapter settings ready If possible please have the adapter connected in a computer ready to run diagnostic tests 3 Please visit www sealevel com for the latest software updates and manuals 4 Technical support is available Monday through Friday from 8 00 a m to 5 00 p m Eastern time Technical support can be reached at 864 843 4343 RETURN AUTHORIZATION MUST BE OBTAINED FROM SEALEVEL SYSTEMS BEFORE RETURNED MERCHANDISE WILL BE ACCEPTED AUTHORIZATION CAN BE OBTAINED BY CALLING SEALEVEL SYSTEMS AND REQUESTING A RETURN MERCHANDISE AUTHORIZATION RMA NUMBER Sealevel Systems SeaLINK 4851 Page 11 Appendix C Electrical Interface Appendix C Electrical Interface RS 422 The RS 422 specification defines the electrical characteri
7. 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 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 ine H 5 to 8 Data Bits gt Unused campera 1 pee Ly i 1 T To A fe e an e aS I 1 I lam STORY 4 ile ta maa Ub pape EAS LA J tt 0 Itu felii kl 15 Lk 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 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 i e 9600 N 8 1 Seale
8. cm Sealevel Systems SeaLINK 4851 Page 9 Appendix A Troubleshooting Appendix A Troubleshooting Serial Utility test software is supplied with the Sealevel Systems adapter and should be used in the troubleshooting procedures Using this software and following these steps most common problems can be eliminated 1 If your adapter isn t working first check to make sure that USB support is enabled in the System BIOS and it is functioning properly in the operating system This can be done by using either the Windows 98 ME or Windows 2000 Device Manager Ensure that the Sealevel Systems software has been installed on the machine so that the necessary files are in place to complete the installation When the SeaLINK 4851 is configured properly the USB Enabled LED EN will be lit This should allow you to use Sealevel s WinSSD utility and the supplied loopback plug to check communications The supplied loopback plug connects TD to RD If you decide to test the Modem Control Signals a full pin loopback plug will be required Details on loopback plugs are included on WinSSD Contact Sealevel Systems if you need further assistance When testing the SeaLINK 4851 in loopback mode you should see both the TD and RD LED s flashing as well as seeing echoed data on the screen The loopback test first transmits a HEX pattern SSAA and then an ASCII string of data If this test passes then the SeaLINK 485 I is ready for use in your
9. dy installed the software by running Setup simply click Next to proceed The drivers that were installed during setup will automatically be used to configure the adapter for use Sealevel Systems SeaLINK 4851 Page 3 Installation Add New Hardware Wizard Windows has now located a driver and installed the software After the driver has been located click Finish You should see one more New Hardware Found indicating the actual port being created If you view your systems Device Manager at this point you should have a new COM port in the Port COM amp LPT Device Class It should look similar to the screen shot on the following page Sealevel Systems SeaLINK 4851 Page 4 Installation System Properties Hard disk controllers 3 Keyboard Monitors Mouse lt Multi function adapters 49 Network adapters i Ports COM amp LPT ii Communications Port COM1 Printer Port LPT1 o SeaLlNK 485 USB to RS 422 485 Serial Converter COMS 5 a SCSI controllers i SyQuest Parallel Port Driver TA Sound video and game controllers System devices Universal Serial Bus controllers You can access your new COM port by using the assigned COM identifier shown above In this case it is COMS but this assignment will vary from system to system At this point the hardware is recognized To verify operation use Sealevel Systems supplied WinSSD diagnostic utility WinSSD can be found in the Start
10. l 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 reguires 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 Sealevel Systems SeaLINK 4851 Page 12 Appendix C Electrical InterfaceGround Loop Phenomenon Appendix D Ground Loop Phenomenon What is Ground Loop Ground loop Phenomenon occurs when two or more pieces of equipment are connected together with a common ground and a different ground potential exists at each location This current can cause the connected equipment to experience noise that in turn causes data transmission errors In extreme cases ground current can cause equipment malfunction or even destruction Cabling Recommendations When connecting the SeaLINK 4851 in an RS 485 network care should be
11. pstream Host Hub e Sealevel Software Sealevel Systems SeaLINK 4851 Page 1 Installation Installation Operating System Installation Please note that you should install the software before the hardware Choose Install Software at the beginning of the CD and select the Serial I O software drivers and install SeaCOM System Installation The screen captures below are taken from a Windows 98 installation Your particular operating system may differ slightly from what is shown based on your version of windows The SeaLINK 4851 can be connected to any Upstream Type A port either at the PC host or an Upstream Hub The SeaLINK 485I is hot pluggable meaning there is no need to power down your computer prior to installation The SeaLINK 485I has an onboard 8 position dip switch that is used to configure the interface Prior to connecting the SeaLINK 485I be sure to configure this dip switch for your specific application Please see the Configuration section for more information The SeaLINK 4851 is defaulted to RS 422 mode so changes are only required if you will be using the product in an RS 485 application 1 After installing the software connect SeaLINK 4851 to an Upstream Host or Hub New Hardware Found This indicates that the system has recognized the new device and will now proceed to locate a driver Sealevel Systems SeaLINK 4851 Page 2 Installation Add New Hardware Wizard Since you have alrea
12. stics 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 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 electrica
13. taken that both ends of the network are not isolated from ground see Figure 4 This floating ground condition could cause capacitive or inductive coupling of voltages that will cause a break down in the DC to DC converter circuit or in the opto isolator circuit This condition will cause data errors and possibly destruction of the receiver circuit A DATA B DATA Non Isolated Isolated Adapter round Adapter Isolation Barrier Figure 4 SeaLINK 4851 cabling example Sealevel Systems SeaLINK 4851 Page 13 Appendix E Asynchronous Communications Appendix E 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
14. uropean Commission To obey these directives the following European standards must be met EN55022 Class B 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 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 EMC directives Sealevel Systems SeaLINK 4851 Page 16 Warranty Warranty Sealevel Systems Inc provides a lifetime warranty for WARRANTY this product Should this product fail to be in good working order at any time during this period Sealevel Systems will at it s option replace or repair it at no additional charge except as set forth in the following terms This warranty does not apply to products damaged by misuse modifications accident or disaster Sealevel Systems assumes no liability for any damages lost profits lost savings or any other incidental or consequential damage resulting from the use misuse of or inability to use this product Sealevel Systems will not be liable for any claim made by any other related party RETURN AUTHORIZATION MUST BE OBTAINED FROM SEALEVEL SYSTEMS BEFORE RETURNED ME
15. vel Systems SeaLINK 4851 Page 14 Appendix F Silk Screen Appendix F Silk Screen lt 2 09 in 1 01 DI et 20 10 02000 II op moi jet LE ti 0 pa 230 LILI oo jan od a gi DI NN KAKAK loe N D300 mM an N DII o go 00190 mo oa co HL deea I vie Es rica lt mx E1 cm i SS Is 100 000 E 311 WI c 21 HEE 15 1 IL V III lt 1 39 in gt Sealevel Systems SeaLINK 4851 Page 15 Appendix G Compliance Notices Appendix G 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 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 E
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