2801, 2802, 2803 User Manual
Contents
1. Sealevel Systems Inc SL9103 Revision 4 2007 Sealevel Systems Incorporated All rights reserved Introduction Introduction Overview The Sealevel Systems SeaLINK 8 family of products equips the PC with 8 USB to Asynchronous serial ports Three different model numbers are available that offer a variety of port options Model 2801 equips the PC with 8 additional RS 232 ports that support a full RS 232 interface and data rates up to 460 8K baud Model 2802 equips the PC with 8 RS 422 485 ports that support data rates up to 921 6K baud and provide selectable line termination and biasing 2 wire RS 485 line turnaround is supported via an onboard hardware circuit Model 2803 equips the PC with 8 user configurable RS 232 422 485 ports Each port is individually configurable and the interface is selected by configuring two dipswitch positions The advantage of this product over more traditional approaches is that it does not require opening the computer case nor does it require resources such as I O ports or IRQs It does require a system that supports USB both in terms of hardware and operating system What s Included The SeaLINK 8 is shipped with the following items If any of these items is missing or damaged contact the supplier e SeaLINK 8 USB to Asynchronous Serial Converter e USB Cable Part Number CA179 for Connecting to Upstream Host Hub e Sealevel Software Sealevel Systems SeaLINK 8 Page 1 Installation Insta2. and the test will fail If you plan on using this device in 2 wire mode test the adapter in RS 422 mode first Then configure the adapter for your application Sealevel Systems SeaLINK 8 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 Read this manual thoroughly before attempting to install the adapter in your system 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 Sealevel Systems maintains a web site on the Internet The address is www sealevel com The latest software updates and newest manuals are available via our FTP site that can be accessed from our home page Technical support is available Monday thru 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 8 Page 11 Appendix C Electrical Interface Appendix C Electrical Interface RS 232 Quite possibly the most widely used communication standard is RS 232 This implementation has been defined and revised se
3. K 8 Page 14 Appendix E 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 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 e EN55022 Class A Limits and methods of measurement of radio interference characteristics of information technology equipment e EN55024 Information technology equipment Immunity characteristics Limits and methods of measurement e EN60950 IEC950 Safety of information technology equipment including electrical business equipment Warning This is a Class A Product In a domestic en
4. SEALEVEL SYSTEMS INCORPORATED SeaLINK 8 USB Seal INK ee Part 280X Sealevel Systems Inc P O Box 830 Liberty SC 29657 USA Phone 864 843 4343 FAX 864 843 3067 www sealevel com Contents INTRODUCTION patina ella INSTALLATION INSTRUCTIONS ccccccccccscscscccccscccccccccccscccscsces PHYSICAL INSTALLATION 3 CONFIGURATION cccccccsssssssssssssssssssssssssssssssssssssssssssssssssssscsees D FACTORY CONFIGURATION iii 5 ELECTRICAL INTERFACE SELECTION 5 MODE SELECT CONFIGURATION iii 6 INTERFACE BIASING CONFIGURATION iii 7 TECHNICAL NOTE i di TECHNICAL DESCRIPTION iscessscsstuessciscassscsdenesesincceccavcceseciaseenl D SPECIFICATIONS paia APPENDIX A TROUBLESHOOTING cccsssssssssscsssssscscescsscesees 10 APPENDIX B HOW TO GET ASSISTANCE ccsssscscssssresesseee LI APPENDIX C ELECTRICAL INTERFACE ccsssssssssssscceseseee 12 APPENDIX D ASYNCHRONOUS COMMUNICATIONS 00006 14 APPENDIX E COMPLIANCE NOTICES sscccssssssssssssssssseees 15 Figures Figure 1 Dip Switches SW1 SW4 RS 422 Default Mode 6 Figure 2 Electrical Interface Mode Selection sscssssssssssssssseesees 6 Figure 3 Electrical Interface Termination and Biasing Selection 7 Figure 4 Asynchronous Communications Bit Diagram 00 14
5. ST Request To Send Positive Request To Send Negative Receive Data Positive BS Receive Data Negative Clear To Send Positive Clear To Send Negative RS 232 DB 9 Male TX Transmit Data RTS _ _ Request To Send DTR Data Terminal Ready Receive Data Data Carrier Detect RIO Ring Indicator CTS DSR Data Set Ready DCD TX RTS DTR CTS Clear To Send DSR DCD RI Sealevel Systems SeaLINK 8 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 This device is a high power USB device It must be plugged into the USB root hub or a self powered hub capable of supplying 500 mA per port Mean Time Between Failures MTBF Greater than 150 000 hours Calculated Physical Dimensions Package Length 8 68 inches 22 04 cm Package Width 5 985 inches 15 20 cm Package Height 2 062 inches 5 24 cm Sealevel Systems SeaLINK 8 Page 9 Appendix A Troubleshooting Appendix A Troubleshooting Serial Utility test software is supplied with the Sealevel Systems adapt
6. 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 Nine k a 5 to 8 Data Bits Unused Ae 1 saws al La i E Sa Fassi ahs sles he whe abe ketal 2 oe I I ler ISTP 1 PE PEPEE E Spe Ss doi pala 0 I DUI iS LI F 15 ke 2 Figure 4 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 Sealevel Systems SeaLIN
7. 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 control signals RS 485 does not define a physical connector Sealevel Systems SeaLINK 8 Page 13 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
8. aLINK USB serial adapter NOTE Windows NT is not USB aware and thus cannot A support this device Sealevel Systems SeaLINK 8 Page 2 Installation Physical 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 8 can be connected to any upstream type A port either at the PC host or an upstream hub The SeaLINK 8 is hot pluggable meaning there is no need to power down your computer prior to installation Connect the SeaLINK 8 to an upstream host or hub The New Hardware Found wizard will now proceed to locate the appropriate drivers These drivers were installed during the SeaCOM software setup procedure Once the drivers are found a new window will pop up indicating the installation of each of the eight new ports If you view the system s Device Manager you should have new COM ports in the Ports COM amp LPT Device Class This is shown on the following page Sealevel Systems SeaLINK 8 Page 3 Installation System Properties Monitors Mouse 4 Network adapters iY Ports COM amp LPT Communications Port COM1 F Communications Port COM2 F Printer Port LPT1 sE SeaLINK 8 USB Serial Converter Port 1 COM12 F SeaLINK 8 USB Serial Converter Port 2 COM13 F SeaLINK 8 USB Serial Converter Port 3 COM14 SeaLINK 8 USB S
9. 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 8 is a trademark of Sealevel Systems Incorporated Sealevel Systems SeaLINK 8 Page 16
10. e 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 Sealevel Systems SeaLINK 8 Page 12 Appendix C Electrical Interface RS 485 RS 485 is backwardly compatible with RS 422 however it is optimized for party line 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
11. er 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 8 is configured properly the Power LED 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 8 in loopback mode you should see the port LED s flashing as well as seeing echoed data on the screen The loopback test first transmits a HEX pattern 5SAA and then an ASCII string of data If this test passes then the SeaLINK 8 is ready for use in your application Please note that if the adapter 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
12. erial Converter Port 4 COM15 sE SeaLINK 8 USB Serial Converter Port 5 COM16 F SeaLINK 8 USB Serial Converter Port 6 COM17 F SeaLINK 8 USB Serial Converter Port 7 COM18 iu F SeaLINK 8 USB Serial Converter Port 8 COM19 f RAPER Ee ese eae RMS ve BET DI You can access your new COM ports by using the assigned COM identifiers as shown above In this case it is COM s 12 thru 19 However this assignment will vary from system to system At this point the hardware is recognized and ready to use Sealevel Systems SeaLINK 8 Page 4 Configuration Configuration Factory configuration Each device ships from Sealevel Systems with the following configuration Model 2801 SeaLINK 8 232 USB to RS 232 Converter Contains no user configurable components Model 2802 SeaLINK 8 485 USB to RS 422 485 Converter RS 422 4 wire full duplex mode selected Transmitter always enabled Receiver always enabled and terminated and biased as follows 1200hm terminator between RX and RX 1Kohm pull up on RX 1Kohm pull down on RX Model 2803 SeaLINK 8 USB to RS 232 422 485 Converter RS 422 4 wire full duplex mode selected Transmitter always enabled Receiver always enabled and terminated and biased as follows 1200hm terminator between RX and RX 1Kohm pull up on RX 1Kohm pull down on RX In order to change the configuration the box must be opened Do this by removing the four screws that attach the two halv
13. es of the box Electrical Interface Selection Each port of the SeaLINK 8 models 2802 and 2803 can be individually configured for the specific electrical interface Model 2802 supports RS 422 485 while Model 2803 supports RS 232 422 485 This is selectable via the dipswitch associated with each port Each of the switch positions is described on the following page Sealevel Systems SeaLINK 8 Page 5 Configuration Below is a figure of dipswitches SW1 SW2 SW3 and SW4 Each switch has a total of twelve positions and serves to configure two ports Six positions are used for each port The default mode of RS 422 4 wire full duplex is shown SW2 SWI PORT 4 PORT3 PORT2 PORTI 12111098765432 1 12111098 7654321 PU T M1MO MODE PDPUPU T Mi MO PDPUPU T Mi Mo MODE MODE SW4 SW3 PORT 8 PORT 7 PORT 6 PORT5 PDPUPU T M1MO PDPUPU T Mi Mo PDPUPU T M1MO PDPUPU T Mi MO MODE MODE MODE MODE Figure 1 Dip Switches SWI SW4 RS 422 Default Mode Mode Select Configuration The first two positions for each po
14. hm pull down resistor connected to RX RS 232 mode always OFF RS 422 mode always ON RS 485 mode ON if not provided by another device on the bus T 1200hm terminating resistor connected between RX and RX RS 232 mode always OFF RS 422 mode always ON RS 485 mode ON if physically located at one end of bus INTERFACE BIASING SWITCH PD PU PU T 232 OFF OFF OFF OFF 422 ON ON ON ON 485 ON ON ON ON IF END OF 485 BUS Figure 3 Electrical Interface Termination and Biasing Selection Technical Note Contrary to some of our other products there are no provisions on board for looping TX to RX and TX to RX for 2 wire RS 485 mode These connections must be made externally inside the mating DB 9 connector Refer to the RS 422 pinout diagram for the appropriate pin numbers Sealevel Systems SeaLINK 8 Page 7 Specifications Technical Description The SeaLINK 8 utilizes eight USB UARTs These chips feature programmable baud rate data format 128 byte Dual Port TX Buffer and 384 byte Dual Port RX Buffer The RS 232 422 485 transceiver supports data rates up to 921 6K baud for RS 422 485 and 460 8K baud for RS 232 Features e Hot pluggable device that does not require opening the case e No system resources are required i e I O ports or IRQs e LED status indicators for power and port activity Connector Pin Assignments RS 422 485 DB 9 Male GND Ground
15. llation Instructions Windows 98 ME 2000 XP Vista Operating Systems Do not connect the device to a USB port until the software is installed 1 Start Windows 2 Insert the Sealevel Software CD in to your CD drive 3 If Auto Start is enabled the installation window will automatically appear Otherwise navigate to the root directory of your CD drive and double click the autorun exe application to launch the installation window 4 Select Install Software 5 Select the Part Number for your device from the listing 6 The setup file will automatically detect the operating environment and install the proper components Follow the information presented on the installation 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 the driver being loaded It will not cause any harm to your system 8 During setup you 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 included to remove the driver and all registry INI file entries from your system 9 Proceed with the physical installation of your Se
16. rt are used to select the electrical interface mode In RS 422 mode the transmitter and receiver are always enabled 485 WE refers to RS 485 mode with receiver echo In this mode the receiver is always enabled If the card is in 2 wire mode all transmitted data will be echoed back 485 NE refers to RS 485 mode with no receiver echo In this mode the receiver is enabled only when no data is being transmitted In either RS 485 mode the transmitter is only enabled during data transmission Refer to the chart below for specific switch settings Note that this chart appears in the silk screen on the board as well MODE SELECT SWITCH MI1 MO 232 OFF OFF 422 OFF ON 485 WE ON OFF 485 NE ON ON Figure 2 Electrical Interface Mode Selection Sealevel Systems SeaLINK 8 Page 6 Configuration Interface Biasing Configuration The last four positions for each port are used to select the line termination and bias settings Refer to the chart below for specific switch settings of the three supported electrical interface modes Note that this chart appears in the silk screen on the board as well PD 1Kohm pull down resistor connected to RX RS 232 mode always OFF RS 422 mode always ON RS 485 mode ON if not provided by another device on the bus PU 5 1Kohm pull up resistor connected to CTS RS 232 mode always OFF RS 422 mode always ON RS 485 mode always ON PU 1Ko
17. veral times and is often referred to as RS 232 or EIA TIA 232 The IBM PC computer defined the RS 232 port on a 9 pin D sub connector and subsequently the EIA TIA approved this implementation as the EIA TIA 574 standard This standard is defined as the 9 Position Non Synchronous Interface between Data Terminal Equipment and Data Circuit Terminating Equipment Employing Serial Binary Data Interchange Both implementations are in wide spread use and will be referred to as RS 232 in this document RS 232 is capable of operating at data rates up to 20 Kbps at distances less than 50 ft The absolute maximum data rate may vary due to line conditions and cable lengths RS 232 is a single ended or unbalanced interface meaning that a single electrical signal is compared to a common signal ground to determine binary logic states The RS 232 and the EIA TIA 574 specification define two types of interface circuits Data Terminal Equipment DTE and Data Circuit Terminating Equipment DCE The SeaPORT 4 is a DTE device 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 differenc
18. vironment 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 cable is provided or if an alternate cable is required use high quality shielded cabling to maintain compliance with FCC EMC directives Sealevel Systems SeaLINK 8 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 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 MERCHANDISE WILL BE ACCEPTED AUTHORIZATION CAN BE OBTAINED BY CALLING SEALEVEL SYSTEMS AND REQUESTING A RETURN MERCHANDISE AUTHORIZATION RMA NUMBER Sealevel Systems Incorporated 2779 Greenville Highway P O Box 830 Liberty SC 29657 USA 864 843 4343 FAX 864 843 3067 www sealevel com email support sealevel
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