7404 User Manual
Contents
1. 3 Figure 2 Switches SW1 SW4 RS 485 Auto Enabled with No Echo and the termination resistor in circuit 3 Figure 3 Switches SW1 SW4 RS 485 Auto Enabled with Echo and no termination resistor in circuit 3 Figure 4 Switches SW1 SW4 RS 485 RTS Enabled with No Echo and NO termination resistor in circuil d Figure 5 Switches SW1 SW4 RS 485 RTS Enabled with Echo and no termination resistor in circuit 4 Figure 6 Asynchronous Communications Bit Diagram 15 O Sealevel Systems Inc SL9064 Revision 5 2007 Sealevel Systems Incorporated All rights reserved OBIntroduction Introduction Overview The Sealevel COMM 4 PCI is a four channel RS 232 485 422 PCI Bus serial VO adapter supporting data rates up to 460 8K bps The RS 232 compatibility allows for connection to devices utilizing the RS 232 electrical interface such as modems data entry terminals and plotters RS 422 provides excellent communications for long distance device connections up to 4000ft where noise immunity and high data integrity are essential RS 485 is optimized for Multi Drop or Party line operations selecting data fro2. 8 CONNECTOR PIN ASSIGNMENTS asss 8 RS 422 485 DB 9 Male iese se ee ee ee ee ee ER Re ee 8 RS 232 DB 9 Male ee a Re Re ee Re Re ee e 8 RS 232 R 422 485 DB 37 Male 9 SPECIFICATIONS u sedes sees seen Ee sede de den Gene dese besk soene L ENVIRONMENTAL SPECIFICATIONS esse ee esse ee ee se ee ee ee ee ee ee ee ee ee ee 10 MANUFACTURING aa RE Ee iaa Ge Wea Ve Ee ee ed 10 POWER CONSUMPTION ee ee ee ee Re Re ee ee ee ee ee ee 10 MEAN TIME BETWEEN FAILURES M TBP 10 PHYSICAL DIMENSIONS ee ee ee Re Re ee ee ee Re Re ee 10 APPENDIX TROUBLESHOOTING 11 APPENDIX B How TO GET ASSISTANCE 12 APPENDIX C ELECTRICAL INTERFACE 13 RS 2322 saqsa qutuykaka astapakuq i guess 13 AE RE E E OE EE EE EE AR 13 KERE EE RE OE OE NG 14 APPENDIX D ASYNCHRONOUS COMMUNICATIONS 15 APPENDIX E SILK SCREEN LO APPENDIX F COMPLIANCE NOTICES 17 FEDERAL COMMUNICATIONS COMMISSION STATEMENT 17 EMC DIRECTIVE STATEMENT ees esse ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee 17 Figures Figure 1 Switches SW1 SW4 RS 422
3. COMM 4 PCI is a trademark of Sealevel Systems Incorporated Sealevel Systems COMM 4 PCI Page 18
4. 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 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 F 5 to 8 Data Bits Unused Pemain aie Si 4 1 a y 1 a T EE T EDE ETE EER EI I I I l I l I ler STOP sd ise Estat NES TE 0 I ma e AAA 153 L 2 Figure 7 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
5. SEALEVEL SYSTEMS INCORPORATED COMM 222 PCT USER MANUAL A N VO ceria MITE M i Mh ie Phe t ut AL Part 7404 Sealevel Systems Inc P O Box 830 Liberty SC 29657 USA Phone 864 843 4343 FAX 864 843 3067 www sealevel com Contents INTRODUCTION u a u u A OVERVIEW os S a Guna u Daun ee gee ee ees ede ee se eek ee ir 1 WHAT S INCLUDED S ee esse ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee Sau ui 1 FACTORY DEFAULT SETTINGS ee ee ee ee ee 1 CARD SETUP S qasa od ede ds iia RS 485 ENABLE MopEs 2 Interface Mode Examples SW1 SW4 continued 4 ADDRESS AND IRQ SELECTION sees es se ee ee ee se ee ee ee ee ee ee Re ee ee ee 4 ELECTRICAL INTERFACE SELECTION ee ee ee ee ee ee ee ee 5 CEOCKIMODES Qa sS Heche AG Ee ES ee vous ov dud RD aka au ta 6 BAUD RATES AND DIVISORS FOR THE DIV1 MODE esse sees sees 6 INSTALLATION ninia 1 OPERATING SYSTEM INSTALLATION esse sesse ese se ee ee ee ee ee ee ee ee ee ee 7 For Windows Users iese ese ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee ee 7 Other Operating Systems Ge Re GR ee RA Se RR Ge 7 SYSTEM INSTALLATION ee sees sees se se se se ee ee ee ee ee Re ee ee Ge RR Re Re ee 7 TECHNICAL DESCRIPTION
6. ealevel 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 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 COMM 4 PCI Page 13 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 selec
7. eral times and is often referred to as RS 232 C D E or EIA TIA 232 C D E It is defined as Interface between Data Terminal Equipment and Data Circuit Terminating Equipment Employing Serial Binary Data Interchange The mechanical implementation of RS 232 is on a 25 pin D sub connector 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 has 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 20K bps 50 ft The absolute maximum data rate may vary due to line conditions and cable lengths RS 232 often operates at 38 4K bps over very short distances The voltage levels defined by RS 232 range from 12 to 12 volts 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 A voltage of 12 volts usually 3 to 10 volts represents a binary 0 space and 12 volts 3 to 10 volts denote a binary 1 mark 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 S
8. esigned 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 Tnformation 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 environment this product may cause radio interference in which case the user may be required to take adequate measures Always use cabling provided with this product if possible If no cable is provided or if an alternate cable is required use high quality shielded cabl
9. ing to maintain compliance with FCC EMC directives Sealevel Systems COMM 4 PCI Page 17 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 supportO 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
10. 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 COMM 4 PCI Page 15 Appendix E Silk Screen Appendix E Silk Screen 4 2 O BBBBBBBB EERAERAE lI 1 A E8 T El EG TA ES dl RTS ES E a RT 4 El ol m m m m m oof PEE A o I E AE E SII e HH Ee OE ES ROEM KKNK I is is 1 O am of F P EE ip BEE I IIIIIAIIII IIIIIIIIIIAI i 1 3h IIIIIIIIOI IIII T EE P a TT x MIE di E E TE vo ELEK 6 5 Sealevel Systems COMM 4 PCI Page 16 Appendix F Compliance Notices Appendix F Compliance Notices Federal Communications Commission Statement FCC This equipment has been tested and found to comply with the limits for Class A digital device pursuant to Part 15 of the FCC Rules These limits are d
11. m multiple peripherals as many as 31 devices can be connected on an RS 485 bus In both RS 485 and RS 422 modes the card works seamlessly with the standard operating system serial driver In RS 485 mode our special auto enable feature allows the RS 485 ports to be viewed by the operating system as a COM port This allows the standard COM driver to be utilized for RS 485 communications Our on board hardware automatically handles the RS 485 driver enable What s Included The COMM 4 PCI is shipped with the following items If any of these items is missing or damaged contact the supplier e COMM 4 PCI Serial VO Adapter e Sealevel Software e Spider Cable providing 4 DB 9 connectors Factory Default Settings The COMM 4 PCI factory default settings are as follows Port Clock DIV Mode Enable Mode Port 1 4 RS 422 Port 2 4 RS 422 Port 3 4 RS 422 Port 4 4 RS 422 To install the COMM 4 PCI using factory default settings refer to Installation on page 7 Sealevel Systems COMM 4 PCI 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 Req
12. n the divide by 4 mode silk screen D4 To select the Baud rates above 115 2K select the divide by 1 mode silk screen D1 Baud Rates and Divisors for the DIV1 mode The following table shows some common data rates and the rates you should choose to match them if using the adapter in the DIV1 mode For this Data Rate Choose this Data Rate 1200 bps 300 bps 2400 bps 600 bps 4800 bps 1200 bps 9600 bps 2400 bps 19 2K bps 4800 bps 57 6 K bps 14 4K bps 115 2 K bps 28 8K bps 230 4K bps 57 6 K bps 460 8K bps 115 2 K bps If your communications package allows the use of Baud rate divisors choose the appropriate divisor from the following table For this Data Rate Choose this Divisor 1200 bps 384 2400 bps 192 4800 bps 96 9600 bps 48 19 2K bps 24 38 4K bps 2 57 6K bps 8 115 2K bps 4 2 1 230 4K bps 460 8K bps Sealevel Systems COMM 4 PCI Page 6 2BInstallation Installation Operating System Installation For Windows Users Start by choosing Install Software at the beginning of the CD Choose Asynchronous COM Port Software SeaCOM Other Operating Systems Refer to the appropriate section of the Serial Utilities Software System Installation The COMM 4 PCI can be installed in any of the PCI expansion slots and contains configuration options for each port that must be set for proper Operation Turn off PC power Disconnect the p
13. nd no termination resistor in circuit AT RT NE T Figure 5 Switches SW1 SW4 RS 485 RTS Enabled with Echo and no termination resistor in circuit Address and IRO selection The COMM 4 PCI is automatically assigned resources by your motherboard BIOS Only the VO addresses may be modified by the user Adding or removing other hardware may change the assignment of I O addresses and IRQs Sealevel Systems COMM 4 PCI Page 4 Card Setup Electrical Interface Selection Each port on the COMM 4 PCI has the ability to be used in either RS 232 or RS 422 485 This is selectable via eight 24 pin DIP shunts at E1 E8 Please use the following illustration to aid in the configuration of your electrical interface RS 422 RS 422 Port 4 Port 4 m N RS 422 RS 232 m N RS 232 W pons Y RS 232 RS 422 m Port 3 H m UU RS 422 RS 232 m Un RS 422 Port 2 Port 2 m ies XN a RS 422 RS 232 m ies SS a RS 422 RS 232 Port 1 Port 1 m OO RS 232 m OO RS 232 RS 422 485 RS 232 Figure 6 Headers E1 E4 Electrical Interface Selection Sealevel Systems COMM 4 PCI Page 5 Card Setup Clock Modes The COMM 4 PCI employs a unique clocking option that allows the end user to select from divide by 4 and divide by 1 clocking modes These modes are selected at Header J1 To select the Baud rates commonly associated with COM ports i e 2400 4800 9600 19 2 115 2K bps place the jumper i
14. nical Description Connector Pin Assignments RS 232 RS 422 485 DB 37 Male Port RS 422 485 RS 232 RX DCD RX RD TX TD TX GND RTS RTS CTS CTS Technical Note Board connector is a DB 37M Mating connector is a DB 37S ACON P N D 37SK SFS T or equivalent Sealevel Systems COMM 4 PCI Page 9 Specifications Specifications Environmental Specifications Specification Operating Storage Temperature 0 to 50 C 20 to 70 C Range 32 to 122 F 4 to 158 E 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 U L 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 Supply line 12 VDC 12 VDC 5 VDC 100 mA 620 mA Mean Time Between Failures MTBF Greater than 150 000 hours Calculated Physical Dimensions Board length 6 5 inches 16 51 cm Board Height including Goldfingers 4 2 inches 10 66 cm Board Height excluding Goldfingers 3 875 inches 9 841 cm Sealevel Systems COMM 4 PCI Page 10 SBAppendix A Troubleshooting Appendix A Troubleshooting Sealevel Software is supplied with the Sealevel Systems adapter and will be used in the troubleshooting procedures By using this software and following these simple steps most common problems can be eliminated with
15. out the need to call Technical Support 1 Identify all I O adapters currently installed in your system This includes your on board serial ports controller cards sound cards etc The I O addresses used by these adapters as well as the IRQ if any should be identified Configure your Sealevel Systems adapter so that there is no conflict with currently installed adapters No two adapters can occupy the same I O address Make sure the Sealevel Systems adapter is using a unique IRQ While the Sealevel Systems adapter does allow the sharing of IRQs many other adapters i e SCSI adapters amp on board serial ports do not The IRQ is typically selected via an on board header block Refer to the section on Card Setup for help in choosing an I O address and IRQ Make sure the Sealevel Systems adapter is securely installed in a motherboard slot When running DOS or Windows 3 x refer to the supplied Sealevel Software and this User Manual to verify that the Sealevel Systems adapter is configured correctly This software contains a diagnostic program SSD that will verify if an adapter is configured properly This diagnostic program is written with the user in mind and is easy to use For Windows 95 98 ME NT 2000 the diagnostic tool WinSSD is installed in the SeaCOM folder on the Start Menu during the setup process First find the ports using the Device Manager then use WinSSD to verify that the ports are functional Al
16. ower cord Remove the PC case cover Locate an available PCI slot and remove the blank metal slot cover Gently insert the COMM 4 PCI into the slot Make sure that the adapter is seated properly Replace the screw Replace the cover Install the Cable CA 143 Connect the power cord E ASA RED Installation is complete Sealevel Systems COMM 4 PCI Page 7 Technical Description Technical Description The Sealevel Systems COMM 4 PCI provides a PCI interface adapter with 4 RS 232 422 485 asynchronous serial ports for industrial automation and control applications The COMM 4 PCI utilizes the 16C864 UART This chip features programmable baud rates data format interrupt control and industry leading 128 byte transmit and receive FIFOs Connector Pin Assignments RS 422 485 DB 9 Male GND Ground js 6 Output CTS Clear To Send Positive 9 Input CTS Clear To Send Negative 8 Input RS 232 DB 9 Male GND Ground 5 TD TS TR 2 CTS ClearToSend____ 8 mpu SR EES CD l BE RD___ ReceiveData 2 R D D Data Set Ready Ring Indicator Technical Note Please terminate any control signals that are not going to be used The most common way to do this is connect RTS to CTS and RI Also connect DCD to DTR and DSR Terminating these pins if not used will help ensure you get the best performance from your adapter Sealevel Systems COMM 4 PCI Page 8 Tech
17. s to throttle the transmitter or it can confuse the system if the software does not To select the No Echo mode select silk screen position NE Typically each end of the RS 485 bus must have a line terminating resistor RS 422 terminates 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 Only the ends of an RS 485 network should have the 120 Ohm terminating resistor Position 4 silk screen T selects the presence of the 120 Ohm termination resistor across the input data pins RX RX To add the termination select the On position to remove it select the Off position For RS 422 530 449 compatibility set all switches Off Examples on the following pages describe some of the valid settings for SW1 SW4 Sealevel Systems COMM 4 PCI Page 2 Card Setup Interface Mode Examples SW1 SW4 AT RT NE T Figure l Switches SW1 SW4 RS 422 AT RT NE T Figure 2 Switches SW1 SW4 RS 485 Auto Enabled with No Echo and the termination resistor in circuit AT RT NE T Figure 3 Switches SW1 SW4 RS 485 Auto Enabled with Echo and no termination resistor in circuit Sealevel Systems COMM 4 PCI Page 3 Card Setup Interface Mode Examples SW1 SW4 continued AT RT NE T Figure 4 Switches SW1 SW4 RS 485 RTS Enabled with No Echo a
18. tively polled RS 485 allows cable lengths up to 4000 feet and data rates up to 10 Megabits per second The signal levels for RS 485 are the same as those defined by RS 422 RS 485 has electrical characteristics that allow for 32 drivers and 32 receivers to be connected to one line This interface is ideal for multi drop or network environments RS 485 tri state driver not dual state will allow the electrical presence of the driver to be removed from the line Only one driver may be active at a time and the other driver s must be tri stated RS 485 can be cabled in two ways two wire and four wire mode Two wire mode does not allow for full duplex communication and requires that data be transferred in only one direction at a time For half duplex operation the two transmit pins should be connected to the two receive pins Tx to Rx and Tx to Rx Four wire mode allows full duplex data transfers RS 485 does not define a connector pin out or a set of modem control signals RS 485 does not define a physical connector Sealevel Systems COMM 4 PCI Page 14 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
19. uest To Send RTS is typically used to control the state of the driver Some communication software packages refer to RS 485 as RTS enable or RTS block mode transfer One of the unique features of the COMM 4 PCI is the ability to be RS 485 compatible without the need for special software or drivers This ability is especially useful in Windows and other protected mode environments where the lower level I O control is abstracted from the application program This ability means that the user can effectively use the COMM 4 PCI in an RS 485 application with existing i e standard RS 232 software drivers Switches SW1 SW4 are used to control the RS 485 mode functions for the driver circuit The selections are RTS enable silk screen RT or Auto enable silk screen AT The Auto enable feature automatically enables disables the RS 485 interface The RTS mode uses the RTS modem control signal to enable the RS 485 interface and provides backward compatibility with existing software products Position 3 silk screen NE of these switches is used to control the RS 485 enable disable functions for the receiver circuit and determine the state of the RS 422 485 driver The RS 485 Echo is the result of connecting the receiver inputs to the transmitter outputs Every time a character is transmitted it is also received This can be beneficial if the software can handle echoing i e using received character
20. ways use the Sealevel Systems diagnostic software when troubleshooting a problem This will eliminate any software issues from the equation Sealevel Systems COMM 4 PCI Page 11 6BAppendix 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 If possible please have the adapter installed in a computer ready to run diagnostics 3 Sealevel Systems maintains a Home page on the Internet Our home page 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 4 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 COMM 4 PCI Page 12 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 sev
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