SeaLINK+485 USER MANUAL
Contents
1. 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 485 Page 10 Appendix How To Get Assistance Appendix B How To Get Assistance 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 If possible please have the adapter connected in a computer ready to run diagnostics 3 Sealevel Systems provides an FAQ section on its web site Please refer to this for many commonly asked questions This section can be found at http www sealevel com faq htm 4 Visit Sealevel s website at www sealevel com for the latest software updates and newest manuals 5 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 RETURN MERCHANDISE AUTHORIZATION RMA NUMBER Sealevel Systems SeaLINK 485 Page 11 Appendix Electrical Interface Append2. Connecting to Upstream Host Hub e Sealevel Software Sealevel Systems SeaLINK 485 Page 1 Installation Installation Operating System Installation Choose Install Software at the beginning of the CD and select the Serial I O software drivers and install 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 485 can be connected to any Upstream Type A port either at the PC host or an Upstream Hub The SeaLINK 485 is hot pluggable meaning there is no need to power down your computer prior to installation The SeaLINK 485 requires no user hardware configuration since there are no jumpers present on the card 1 Connect SeaLINK 485 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 485 Page 2 Installation Add New Hardware Wizard Since you have already 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 485 Page 3 Installation Windows has now located a driver and installed the software After the driver has been located click Finish You should see one mo
3. PPENDIX COMPLIANCE NOTICES sccccssssssssssssssssseees 15 FEDERAL COMMUNICATIONS COMMISSION 15 EMC DIRECTIVE STATEMENT 15 WARRANTY LO Figures Figure 1 RS 530 422 4 Wire 485 Default ccssscsssssssessssescsessssesesesessess 7 Figure 2 RS 485 2 Wire with Echo 7 Figure 3 RS 485 2 Wire No 7 Figure 4 Asynchronous Communications Bit 14 2001c Sealevel Systems Incorporated All rights reserved Introduction Introduction Overview The Sealevel Systems SeaLINK 485 equips the PC with 1 USB to RS 530 422 485 Asynchronous serial port providing a versatile interface for common RS 530 422 485 needs The advantage of this product over more traditional approaches is that it doesn t require opening the computer case nor does it require resources such as I O ports or IRQ s It does require a system that supports USB both in terms of hardware and operating system What s Included The SeaLINK 485 is shipped with the following items If any of these items is missing or damaged contact the supplier e SeaLINK 485 USB to RS 530 422 485 Serial I O Adapter e USB Cable Part Number CA179 for
4. SEALEVEL SYSTEMS INCORPORATED SeaLINK 485 USER MANUAL Part 2102 s Phone 864 843 4343 FAX 864 843 3067 Liberty SC 29657 USA Contents OPERATING SYSTEM INSTALLATION c ccssscessscssscessscesscssssscessecseseeses 2 SYSTEM INSTALLATION sssesssseeeseeeseeseessesseesrseeererterresseesressresseseresseresses 2 CONFIGURATION 6osssiccsscenscccesssecssedessccencootessecesbaceecoasssseveteceecess O ELECTRICAL INTERFACE SELECTION c ccssscessscsssccsescessesecsscessecseseeses 6 SWITCH EXAMPLES cccccescessscessscessscssscecessessscessscessscsesscsessessesseseseaess 7 TECHNICAL DESCRIPTION cccccssssssccccccccccecesccccscccccccssesecccsces 8 ENVIRONMENTAL 9 MANUFACTURING a 9 POWER CONSUMPTION sscsscesscssscescesscesecesscesscsecsssenscesecsssenscenseesees 9 MEAN TIME BETWEEN FAILURES MT BP 9 PHYSICAL DIMENSIONG css ccsssccsssccssccessccessccecesaceessceesaccesseecesaeens 9 APPENDIX TROUBLESHOOTING cccccscscssscssssscscscscscscseee LO APPENDIX HOW TO GET ASSISTANCE cccccscccsssccccssseeoee LI APPENDIX ELECTRICAL INTERFACE ccccccccssscsccsscssocees 12 5 530 12 RS242 2 RR Ee aS 12 485 13 APPENDIX D ASYNCHRONOUS COMMUNICATIONS 14 A
5. arranty 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 MERCHANDISE WILL BE ACCEPTED AUTHORIZATION CAN BE OBTAINED BY CALLING SEALEVEL SYSTEMS AND REQUESTING 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 485 is a trademark of Sealevel Systems Incorporated Sealevel Systems SeaLINK 485 Page 16
6. es adds and connects SW1 position OFF disables removes and disconnects RS 485 Two Wire Auto Enable Disable 2 Echo Enable Disable Adds or removes the 1K ohm pull up resistor in the RS 422 RS 485 receiver circuit Receive data only 3 Adds or removes the 120 ohm termination Adds or removes the 1K ohm pull down resistor in the RS 422 RS 485 5 receiver circuit Receive data only 7 Connects the TX to RX for RS 485 two wire operation eS __ Connects the TX to RX for RS 485 two wire operation Sealevel Systems SeaLINK 485 Page 6 Configuration Switch Examples Please use the following examples to configure your adapter RS 530 422 Figure 1 RS 530 422 4 Wire 485 Default Figure 2 RS 485 2 Wire with Echo ON RS 485 12345678 Figure 3 RS 485 2 Wire No Echo Sealevel Systems SeaLINK 485 Page 7 Technical Description Technical Description The SeaLINK 485 utilizes a USB UART This chip features programmable baud rate data format 128 byte Dual Port TX Buffer and 384 byte Dual Port RX Buffer The RS 530 422 485 transceiver supports data rates up to 921 6K baud Features e Hot Pluggable device that doesn t require opening the case e system resources are required i e I O ports or IRQ s e status indicators for USB Enabled TD and RD Connector Pin Assignments DB25 Male The SeaLINK 485 complies with the EIA 530 pin out with t
7. he following signals supported Signal Name Mode RDB RX Receive Positive 16 Input Receive Negative 3 Input CTS Clear To Send Positive 13 Input Clear To Send Negative 5 Input DSRB_ DSR Data Set Ready Positive Input Data Set Ready Negative Input DCDB DCD Data Carrier Detect Positive Input Data Carrier Detect Negative Input TDB TX Transmit Positive 14 Output Transmit Negative 2 Output RTSB RTS Request To Send Positive 19 Output RTSA RTS Request To Send Negative 4 Output DTRB DTR Data Terminal Ready Positive 23 Output Data Terminal Ready Negative 20 Output Sealevel Systems SeaLINK 485 Page 8 Specifications Specifications Environmental Specifications Temperature Range 0 to 50 C 20 to 70 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 Sealevel Systems Printed Circuit boards 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 5vbc Rating Soma 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 cm Sealevel Systems SeaLINK 485 Page 9 Appendi
8. it 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 1 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 Sealevel Systems SeaLINK 485 Page 14 Appendix Compliance Notices Appendix E 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 a
9. ix C Electrical Interface RS 530 RS 530 a k a 530 compatibility means that RS 422 signal levels 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 Sealevel Systems adapter is a DTE 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 receiver electrical characteristics that will al
10. low 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 Sealevel Systems SeaLINK 485 Page 12 Appendix Electrical Interface 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 connecto
11. nd 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 issued by the European 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 485 Page 15 Warranty Warranty Sealevel Systems Inc provides a lifetime warranty for 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 w
12. r pin out or a set of modem control signals RS 485 does not define a physical connector Sealevel Systems SeaLINK 485 Page 13 Appendix 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 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 line 9 5 to 8 Data Gee 1 1 A i SFE oe 91 5 2 Figure 4 Asynchronous Communications B
13. re 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 Add New Hardware Wizard Sealevel Systems SeaLINK 485 Page 4 System Properties Monitors Mouse lt Multi function adapters SY Network adapters 2 97 Ports COM amp LPT i F Communications Port COM1 ZZ 9 Printer Port LPT1 SeaLINK 485 USB to RS 422 485 Serial Converter COMS iS amp SCSI controllers 6 SyQuest Parallel Port Driver 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 5 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 Programs group Sealevel Systems SeaLINK 485 Page 5 Configuration Configuration Electrical Interface Selection The port on SeaLINK 485 has the ability to be used as RS 530 422 485 RS 422 or 2 wire RS 485 This is selectable via the DIP switch SW1 The chart below describes each of the switch position s function Please refer to the following page for switch setting examples Switch SW1 ON enabl
14. x A Troubleshooting Appendix A Troubleshooting Serial Utility test software is supplied with the Sealevel Systems adapter and will be used in the troubleshooting procedures Using this software and following these simple steps most common problems can be eliminated without the need to call Technical Support 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 485 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 485 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 55AA and then a ASCII string of data If this test passes then the SeaLINK 485 is ready for use in your application
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