1105 User Manual - Sealevel Systems, Inc
Contents
1. Figure 5 DIP switch SW2 Line Termination and Echo Off On Sealevel Systems DIN485 I Page 4 Card Setup Electrical Interface Examples DIP switch SW2 Figure 6 RS 422 with Termination and Receiver Echo Figure 7 RS 485 2 wire with Termination and Receiver No Echo Figure 8 RS 485 2 wire no Termination and Receiver No Echo Sealevel Systems DIN485 I Page 5 Installation Operating System Installation For Windows Users RS 422 RS 485 Four Wire Master RS 485 Two Wire Auto Mode Installation If your application is 4 wire Full Duplex RS 422 or 4 Wire RS 485 Master where control of the transmitter is not required or 2 wire RS 485 and you intend to use the Auto Mode to control the transmitter simply connect the DIN485 I to an existing RS 232 COM port This will utilize the Operating System Serial Driver to control the COM port You will want to install Sealevel s diagnostic utility WinSSD to test and verify proper operation of the port Start by choosing Install Software at the beginning of the CD Choose Asynchronous COM Port Software SeaCOM Continue with the installation until the Setup Type dialog as shown below appears Choose WinSSD Utility to install just the d2. suse E E E TE 8 TECHNICAL DESCRIPTION wisscssccasioscseseoscsncseacosuessestanserscocbassaccseacoauesbense sooteevosebuesvescsouebeascessoosons erases eooni epesi sS 9 CONNECTOR PIN ASSIGNMENTS lt 2 ok se eee a 9 Power RS 232 Pin Assignments 6 Position Screw 9 RS 422 485 Pin Assignments 6 Position Screw 9 SPE CTRICA TIONS ponbodeosesesevesoducsecssnso ested casvoes 10 ENVIRONMENTAL SPECIFICATIONS cccccccsceesessscecececsenesesescecceesenseseeeeeceesesaaeseeecsesesseeeeceseeeanaaeeeeseeesesssaeeeeeceeeensea 10 MIANUBAGCTURING an bude eae 10 PHY SIGAEADIMENSTIONS boas dh 05 Eady San Hiab da eRe vith BP 10 APPENDIX TROUBLESHOOTING a iissssccschecesessscdiecessvseue bascesceseseidevedaecdecesbseeve SoesescuescevetetesseecosecedevetSeteosesouee 11 APPENDIX HOW GET ASSISTANCE ccsccscsssssssesscccsssssssccrsccccssssssccccessssssscsececcsssssssscenscessssssssceseree 12 APPENDIX ELECTRICAL INTERFACE ccccscccsssssesssccscssesecccccssssscseccccscscsccscecscessscsssscecscessssssescecseces 13 232 AE T E
3. 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 DIN485 I Page 10 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 simple steps most common problems can be eliminated without the need to call Technical Support 1 The DIN485 I is a level converter and therefore requires no system resources such as I O ports or IRQs The 1 O resources of the host RS 232 COM port will be used to access the port If you are experiencing problems a good starting point is to verify proper operation of the host RS 232 COM port Connect the host port TX and RX lines and use Sealevel s WinSSD utility to perform a loopback test If you cannot open the host port ensure that it is enabled in the System BIOS If using a Plug n Play operating system verify that it is recognized by the system If the host RS 232 port is working properly verify that the DIN485 I is configured correctly for your application based on the Card Setup section earlier in this manual After attaching the DIN485 I you may perform a loopback test by connecting TX to RX and TX to RX Keep in mind that this test will fail should you have DIP switch SW2 position 6 on This forces the DIN485 I in
4. i Figure 3 Dip switch SW1 RS 485 RTS Enable Figure 4 Dip switch SW1 RS 485 Data Enable Sealevel Systems DIN485 I Page 3 Card Setup Line Termination and Receiver Echo Off On Typically each end of the RS 485 bus must have a line terminating resistor RS 422 terminates at the receive end only A 120 ohm resistor is across each RS 422 485 input in addition to a 1K ohm pull up pull down combination that biases the receiver inputs DIP switch SW2 allows customization of this interface to specific requirements Each DIP switch position corresponds to a specific portion of the interface If multiple DIN485 I adapters are configured in an RS 485 network only the adapters on each end should have DIP switch SW2 position 1 on One adapter should have DIP switch SW2 positions 2 and 3 on Refer to the table below for each position s operation DIP switch SW2 position 6 is used to control the RS 485 enable disable functions for the receiver circuit and determines 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 enable the No Echo mode DIP switch SW2 position 6 should be on
5. 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 DIN485 I 15 a trademark of Sealevel Systems Incorporated Sealevel Systems DIN485 I Page 18
6. 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 DIN485 I Page 14 Appendix Ground Loop Phenomenon Appendix E 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 the extreme this ground current can cause equipment malfunction or even destruction Cabling Recommendations When connecting the DIN485 II in a RS 485 network care should be taken that both ends of the network are not isolated from ground see Figure 8 This floating ground condition could cause the 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 ue Adapter Isolation Barrier INJA 1 2 Sealevel Systems DIN485 I Page 15 Appendix F Silk Screen 3 938
7. Utility Once the software installation is complete the port must be configured for RTS Enable This is accomplished by using the Device Manager in Windows except NT The port that the DIN485 I is attached must be selected under Ports COM amp LPT Access the RTS Enable checkbox via the Advanced dialog In Windows NT Sealevel s Advanced Ports applet should be used for configuration Sealevel Systems DIN485 I Page 7 Installation Other Operating Systems Linux includes a full featured serial driver that includes support not found in Microsoft s serial driver Most serial drivers offer a mechanism to control RTS from the application layer While this is not as efficient and normally means using Echo to know when to tum off the transmitter for most applications this is adequate The Auto Enable and Data Enable modes can also be used Refer to your operating system documentation for specifics Physical Installation The DIN485 I can be connected to any existing RS 232 port A cable such as Sealevel s CA 186 can be used to attach the DIN485 I DB 25F to the PC s DB 9M connector 1 Locate an existing RS 232 COM port and connect the DIN485 I 2 With the DIN485 I case open configure DIP switches SW1 SW2 for your application 3 Connect the wiring to your external device via the provided 6 position screw terminal The signals are labeled on the board s silkscreen From th
8. ss ah ned Sas SRG ce eee eos RE eR 13 RSA a noar 13 RE ie PP URGED DE AEE 13 APPENDIX D ASYNCHRONOUS 8 14 APPENDIX GROUND LOOP PHENOMENON ccscsssscsssssscssersccccssssscsecccccsssscssersccssscsssscensccssessssscenseees 15 WHATS GROUND LOOP COSC aS vt Bee 15 CABLING RECOMMENDATIONS vd sive avec 15 APPENDIX F SILK SCREEN deswesessssncienceenscessaavacessesecs e eae tose sasvesdeeniass 16 APPENDIX COMPLIANCE NOTICE G cssssssssssssssssccsccccsssscsscnccccssssscscccccsesssscscceccsssssscscececcssssssesscoseces 17 FEDERAL COMMUNICATIONS COMMISSION STATEMENT 17 DIRECTIVE STATEMENT 17 WARRANTY aeeie tei E i e 18 Sealevel Systems Inc SL9138 Revision 7 2006 Sealevel Systems Incorporated All rights reserved Introduction Introduction Overview The Sealevel Systems DIN485 I is an isolated DIN rail mountable single channel RS 232 to RS 422 485 asynchronous converter It provides one field selectabl
9. was designed around an 8250 Universal Asynchronous Receiver Transmitter UART This device allows asynchronous serial data to be transferred through a simple and straightforward programming interface A start bit followed by a pre defined number of data bits 5 6 7 or 8 defines character boundaries for asynchronous communications The end of the character is defined by the transmission of a pre defined number of stop bits usually 1 1 5 or 2 An extra bit used for error detection is often appended before the stop bits Idle state of Odd Even iine 5 8 Data Bits eer 1 A T Eea a oa eaS l 1 1 ler STOP es A ee EIRE AOE 18 J ytd 0 te mis 1 4 24 Figure 9 Asynchronous Communications 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
10. SYSTEMS INCORPORATED DIN485 1 Users Manual Part Number 1105 Sealevel Systems Inc Telephone 864 843 4343 PO Box 830 Fax 864 843 3067 Liberty SC 29657 USA www sealevel com Contents INTRODUCTION cscecsescticctscesccssovsctecoossesvnccuecescescscossedestscosksoseassesces devssescasousssbscuaseaousucsusaebecesseveeens oaseeosssssueceeceeoesees 1 ch Sek suse ch ahs ies wae RE ei eS A ee 1 WHAT E EE See oe cee ahaha HOSEN CBS 1 FACTORY DEFAULT SETTINGS E E 1 CARD SETUP EEE E E ose sedeasoscsdveeus seceoeescdebedeaseseocbaeuane 2 5 485 ENABLE 2 LINE TERMINATION AND RECEIVER ECHO OFEF ON ccssccccsesseeecessceceessececeessececsscecsesseeecsesaeeecsesseceessseecsensseeenenseees 4 Electrical Interface Examples DIP switch 9 2 5 OPERATING SYSTEM INSTALLATION FOR WINDOWS USERS u cccssssssssssscsssscssecsssscssecsssscssssesessees 6 RS 422 RS 485 FOUR WIRE MASTER RS 485 TWO WIRE AUTO MODE 6 RS 485 TWO WIRE AND RS 485 FOUR WIRE SLAVE 6 OTHER OPERATING EE REO O EROE 8 PHYSICAL INSTALLATION
11. aracteristics 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 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 electri
12. cal 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 control signals RS 485 does not define a physical connector Sealevel Systems DIN485 I 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
13. e Sealevel Software CD Factory Default Settings The DIN485 I factory default settings are as follows Port Electrical Specification Port 1 RS 422 To install the DIN485 I using factory default settings refer to Installation For your reference record installed DIN485 I settings below Port Electrical Specification Port 1 Sealevel Systems DIN485 I Page 1 Card Setup Card Setup RS 485 Enable Modes RS 485 is ideal for multi drop or network environments RS 485 requires a tri state driver that will allow the electrical presence of the driver to be removed from the line The driver is in a tri state or high impedance condition when this occurs Only one driver may be active at a time and the other driver 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 DIP switch SW1 is used to control the RS 485 mode functions for the driver circuit The selections are 5 422 Mode Always This is the factory default mode that ensures the transmitter is always enabled This mode is intended for Full Duplex applications such as RS 422 or RS 485 4 wire Master mode where tri state control of the transmitter is not required RS 485 Mode This mode uses an onboard MicroChip PIC microcontroller to sense the baud rate and control the transmitter enabl
14. e RS 422 485 serial port supporting asynchronous data rates up to 115 2K bps The DIN485 I is self powered allowing it to correctly drive multi drop RS 485 networks Isolation is important in installations where the equipment being connected to the PC is either far from the PC or on a different power transformer circuit Ground loop current is a commonly neglected and misunderstood phenomenon that leads to data loss and the destruction of communications interfaces Configure the port as RS 422 for long distance device connections up to 4000ft where noise immunity and high data integrity are essential Select RS 485 and capture data from multiple peripherals in an RS 485 multi drop network Up to 31 RS 485 devices can be connected to automate your data collection In RS 422 and RS 485 Auto modes the card works seamlessly with the standard operating system serial driver Two additional methods are provided to control the communication line in RS 485 mode The Data Enable mode uses the transmitted data to enable the transmitter and requires no software drivers This mode has limitations that will be discussed in more detail later The RTS Enable mode uses the UART modem control signal RTS to control the communication line and requires the Sealevel Systems serial driver What s Included The DIN485 I is shipped with the following items If any of these items is missing or damaged contact the supplier DIN485 I Serial I O Adapter
15. e included hardware select the strain relief clamp that best fits your cable 4 Make sure all connections are secure and that strain relief is correctly installed 5 Close the DIN485 I case and connect the included AC adaptor 6 Ifthe DIN485 I is in RS 422 mode the EN led should now be on since the transmitter is always enabled Installation is complete Please Note On power up the DIN485 I scans the Mode Select DIP switch SW1 one time to determine the communication mode and then branches to the selected control logic No attempt is made to periodically check the switch for a mode change This is done for two reasons First our experience shows that a device such as this is configured for the required application and the mode is not changed after this Due to this reason the product is not burdened with the overhead of always checking this switch At higher baud rates this becomes especially critical due to the speed of the onboard microcontroller The utmost priority is given to sampling the incoming data Why is this important If the DIN485 I has been configured for a particular mode and for some reason it has become necessary to change the communication mode remove power reconfigure the Mode Select DIP switch SW1 for the new mode and reapply power Sealevel Systems DIN485 I Page 8 Technical Description Technical Description The Sealevel Systems DIN485 I converts an existing RS 232 serial port into an isolated DIN ra
16. e signal based on the detected baud rate The logic assumes a minimum baud rate of 1200bps and a word length of 10 bits 1 start bit 8 data bits and 1 stop bit For baud rates of 38 4K or less line turnaround should not exceed 4 bit times 57 6K should not exceed 10 bit times and 115 2K should not exceed 20 bit times after successfully autobauding RS 485 RTS Enable Mode RTS enable mode uses the RTS modem control signal to enable the RS 485 interface and provides backward compatibility with existing software products Sealevel Systems serial driver should be used and configured for RTS control providing a robust RS 485 solution RS 485 Data Enable Mode The Data enable mode uses the transmit data stream to enable disable the transmitter When the data bit is High logic 1 the transmitter will be tri stated and relies on the line biasing resistors to place the line in the proper state For this reason line termination cannot be used thus reducing the data rate and maximum cable length This mode should only be used in applications that prevent the use of the RS 485 Auto Mode or Sealevel Systems serial driver Sealevel Systems DIN485 I Page 2 Card Setup Communication Mode Examples Dip switch SW1 Figure 1 Dip switch SW1 RS 422 Figure 2 Dip switch SW1 RS 485 Auto Enable
17. iagnostic tool A Start Menu Program Group SeaCOM will be created and WinSSD can be started from there installshield Wizard Setup Type Choose the setup type that best suits your needs Typical complete WINSSD Utility RS 485 Two Wire and RS 485 Four Wire Slave Installation If your application is 2 wire Half Duplex RS 485 or 4 Wire Full Duplex RS 485 Slave that requires control of the transmitter the DIN485 I provides 3 methods of control The first method is Auto Enable which uses an onboard microcontroller to sense the baud rate and control the transmitter enable This mode assumes a minimum baud rate of 1200bps and a word length of 10 bits This would be the preferred method as it requires no software in order to work This mode should be used with line termination since the transmitter is driving the line during transmission The second method is RTS Enable which uses Sealevel s Windows based serial drivers to control the UART modem control signal RTS RTS is connected to the transmitter enable circuit and thru software control provides an efficient method of line turnaround This abstracts the application from the low level control and simplifies application development This mode should be used with line termination since the transmitter is driving the line during transmission Sealevel Systems DIN485 I Page 6 Installation The last method is Data Enable which uses the transmitted data strea
18. il mountable field selectable RS 422 485 port for industrial automation and control applications Isolation is important in installations where the equipment being connected to the PC is either far from the PC or on a different power transformer circuit Ground loop current is a commonly neglected and misunderstood phenomenon that leads to data loss and the destruction of communications interfaces Connector Pin Assignments Power RS 232 Pin Assignments 6 Position Screw Terminal Technical Note The modem control signals are biased in the following fashion when using Sealevel s CA 186 cable RTS and CTS are connected DTR is connected to DCD and DSR and RI is tied inactive RS 422 485 Pin Assignments 6 Position Screw Terminal Signal Name Mode RDA R Receive Data Negative _ 8 Input TDB T Transmit Data Positive 9 Output TDA T Transmit Data Negative 10 Output 2 Sealevel Systems DIN485 I Page 9 Specifications Specifications Environmental Specifications Specification Operating Temperature 0 to 70 50 to 105 Range 32 to 158 F 58 to 221 F Humidity Range 10 to 90 R H 10 to 90 Non Condensing Non Condensing Manufacturing 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
19. in LEDS CO LEDI LED2 R5 92 OFF ON OFF ON u1 MODE Appendix Silk Screen Sealevel Systems DIN485 I 2 828 in Page 16 Appendix 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 the users 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 interfere
20. m to enable the transmitter and requires no special software drivers When the transmitted data is a low 0 the transmitter will be enabled to drive the line When the transmitted data is a high 1 the transmitter will be tri stated relying on the line biasing resistors to pull the line to the proper state Due to this termination must not be used and thus data rate and cable length are reduced accordingly The choice of which method to use is simple If your data stream permits the use of the Auto Enable mode always use this option as it permits the simplest installation If Auto Enable is not an option and you are using the DIN485 I in a Windows based system setup the transmitter control for RTS Enable and install Sealevel s SeaCOM software Again if Auto Enable is not an option and your system is not Windows based or if the port you are converting is not PC based use Data Enable If RTS Enable mode is chosen start by choosing Install Software at the beginning of the CD Choose Asynchronous COM Port Software SeaCOM Continue with the installation until the Setup Type dialog as shown below appears Choose Typical complete to install the software including drivers and applications A Start Menu Program Group SeaCOM will be created and WinSSD can be started from there linstallShield Wizeirel Setup Type Choose the setup type that best suits your needs Typical complete WINSSD
21. nce characteristics of information technology equipment EN55024 Information technology equipment Immunity characteristics Limits and methods of measurement EN60950 IEC950 Safety of information technology equipment including electrical business equipment Warning This is a Class A Product In a domestic environment this product may cause radio interference in which case the user may be required to take adequate measures to prevent or correct the interference Always use cabling provided with this product if possible If no cable is provided or if an alternate cable is required use high quality shielded cabling to maintain compliance with FCC EMC directives Sealevel Systems DIN485 I Page 17 Warranty Warranty Sealevel s commitment to providing the best I O solutions is reflected in the Lifetime Warranty that is standard on all Sealevel manufactured products We are able to offer WARRANTY this warranty due to our control of manufacturing quality and the historically high reliability of our products in the field Sealevel products are designed and manufactured at its Liberty South Carolina facility allowing direct control over product development production burn in and testing Sealevel Systems Inc hereafter Sealevel warrants that the Product shall conform to and perform in accordance with published technical specifications and shall be free of defects in materials and workmanship for life In
22. se Will Be Accepted Authorization Can Be Obtained By Calling Sealevel Systems And Requesting A Return Merchandise Authorization RMA Number Sealevel Systems DIN485 I Page 12 Appendix 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 several times and is often referred to as RS 232 EIA TIA 232 The PC computer defined the RS 232 port on a 9 pin D sub connector and subsequently the EIA TIA approved this implementation as the 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 DIN485 I is a DCE device RS 422 The RS 422 specification defines the electrical ch
23. the event of failure Sealevel will repair or replace the product at Sealevel s sole discretion Failures resulting from misapplication or misuse of the Product failure to adhere to any specifications or instructions or failure resulting from neglect or abuse are not covered under this warranty Warranty service is obtained by delivering the Product to Sealevel and providing proof of purchase Return authorization must be obtained from Sealevel Systems before returned merchandise will be accepted Authorization is obtained by calling Sealevel Systems and requesting a Return Merchandise Authorization RMA number The Customer agrees to insure the Product or assume the risk of loss or damage in transit to prepay shipping charges to Sealevel and to use the original shipping container or equivalent Warranty is valid only for original purchaser and is not transferable 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 This warranty applies to Sealevel manufactured Product Product purchased through Sealevel but manufactured by a third party will retain the original manufacturer s warranty Sealevel Systems Incorporated 2779 Greenville Highway P O Box 830 Liberty SC 29657 USA 864 843 4343 FAX 864 843 3067 www
24. to No Echo mode and will prevent the loopback test from passing For loopback purposes always have DIP switch SW2 position 6 off even if you will use No Echo in your actual application During the loopback test pay attention to the TX and RX LEDs as both of these should be on Failure of one or both of these to be on would indicate a hardware problem on the adapter Sealevel Systems DIN485 I Page 11 Appendix How Get Assistance Appendix B How To Get Assistance Please refer to Troubleshooting Guide prior to calling Technical Support 1 Begin by reading 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 Sealevel Systems provides an FAQ section on its web site Please refer to this to answer many common questions This section can be found at http www sealevel com faq asp 4 Sealevel Systems maintains a web page on the Internet Our home page address is www sealevel com The latest software updates and newest manuals are available via our web site 5 Technical support is available Monday to 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 Merchandi
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