MODEL PCI-COM2S USER MANUAL
Contents
1. L COMB A Y BIAS x AUTOB jaja TERM a RTSB ajaja O ECHOB Ha agas AUTOA RTSA x X O D A BIAS state TERM pog So BIAS COMA Figure 3 2 Option Selection Map Jumpers 232 422 Select communications mode Single ended RS232 or Differential RS422 485 TERM Terminate RS422 485 receiver lines BIAS Apply bias to RS422 485 receiver lines CLK X1 CLK X4 Select either 115 2 Kbaud or 460 8 Kbaud maximum RTS Use manual RTS RS485 transceiver control For port A or B AUTO A B Use automatic RTS RS485 transceiver control For port A or B ECHO Locally echo characters 2 wire RS485 only For port A or B 13 Manual PCI COM 2S Chapter 4 Address Selection The card uses two separate address spaces each occupying eight consecutive register locations for COM A and COM B respectively PCI architecture is Plug and Play This means the BIOS or Operating System determines the resources assigned to PCI cards rather than you selecting these resources with switches or jumpers As a result the card s base address cannot be changed it can only be determined To determine the base address that has been assigned to the card run the provided PCIFind EXE utility program PCINT EXE for Windows95 systems This u2. 2 The system should automatically run the install program If the install program does not n 3 Follow the on screen prompts to install the software for this board LINUX 1 Please refer to linux htm on the CD ROM for information on installing under linux Note COM boards can be installed in virtually any operating system We do support installation in earlier versions of Windows and are very likely to support future versions as well Caution ESDA single static discharge can damage your card and cause premature failure Please follow all reasonable precautions to prevent a static discharge such as grounding yourself by touching any grounded surface prior to touching the card 9 Manual PCI COM 2S Hardware Installation 1 Make sure to set switches and jumpers from either the Option Selection section of this manual or from the suggestions of SETUP EXE Do not install card into the computer until the software has been fully installed Turn OFF computer power AND unplug AC power from the system Remove the computer cover Carefully install the card in an available 5V or 3 3V PCI expansion slot you may need to remove a backplate first Inspect for proper fit of the card and tighten screws Make sure that the card mounting bracket is properly screwed into place and that there is a positive chassis ground Install an I O cable onto the card s bracket mounted connector Replace the computer cover and turn ON the computer Enter t
3. a ACCES 1 0 PRODUCTS INC 10623 Roselle Street San Diego CA 92121 858 550 9559 FAX 858 550 7322 contactus accesio com www accesio com MODEL PCI COM2S USER MANUAL FILE MPCI COM2S E1e Notice The information in this document is provided for reference only ACCES does not assume any liability arising out of the application or use of the information or products described herein This document may contain or reference information and products protected by copyrights or patents and does not convey any license under the patent rights of ACCES nor the rights of others IBM PC PC XT and PC AT are registered trademarks of the International Business Machines Corporation Printed in USA Copyright 2001 2005 by ACCES I O Products Inc 10623 Roselle Street San Diego CA 92121 All rights reserved WARNING ALWAYS CONNECT AND DISCONNECT YOUR FIELD CABLING WITH THE COMPUTER POWER OFF ALWAYS TURN COMPUTER POWER OFF BEFORE INSTALLING A CARD CONNECTING AND DISCONNECTING CABLES OR INSTALLING CARDS INTO A SYSTEM WITH THE COMPUTER OR FIELD POWER ON MAY CAUSE DAMAGE TO THE I O CARD AND WILL VOID ALL WARRANTIES IMPLIED OR EXPRESSED 2 Manual PCI COM 2S Warranty Prior to shipment ACCES equipment is thoroughly inspected and tested to applicable specifications However should equipment failure occur ACCES assures its customers that prompt service and support will be available All equipment originally manufactured
4. input Rx ReceieData Table 6 1 Connector Pin Assignments Note If connections are to be made to a CE marked version then CE certifiable cabling and breakout methodology Cable shields connected to ground at the mounting bracket shielded twisted pair wiring etc must be used 19 Manual PCI COM 2S Appendix A Application Considerations Introduction Working with RS422 and RS485 devices is not much different from working with standard RS232 serial devices and these two standards overcome deficiencies in the RS232 standard First the cable length between two RS232 devices must be short less than 50 feet Second many RS232 errors are the result of noise induced on the cables The RS422 standard permits cable lengths up to 5000 feet and because it operates in differential mode it is more immune to induced noise Connections between two RS422 devices with CTS ignored should be as follows Signal 25 25 pin Signal COM 2S 25 9 pin 9 pin 7 mc 2 a RC fo RC fo 12 tmx 2 Table 1 Connections Between Two RS422 Devices A third deficiency of RS232 is that more than two devices cannot share the same cable This is also true for RS422 but RS485 offers all the benefits of RS422 plus allows up to 32 devices to share the same twisted pairs An exception to the foregoing is that multiple RS422 devices can share a single cable if only one will talk and the others will always re
5. 4X UART clock are available by jumper selection The driver receiver used the 75ALS180 is capable of driving extremely long communication lines at high baud rates It can drive up to 60 mA on balanced lines and receive inputs as low as 200 mV differential signal superimposed on common mode noise of 12 V or 7 V In case of communication conflict the driver receivers feature thermal shutdown Two sets of LED indicators are provided on the card The LEDs blink to indicate activity on the transmitting and receiving lines and are useful for problem diagnosis The intensity of the LEDs is inversely proportional to the baud rate used At high baud rates they will be very dim and seem to glow continuously 5 Manual PCI COM 2S Communication Modes The cards support Simplex Half Duplex and Full Duplex communications in a variety of 2 and 4 wire cable connections Simplex is the simplest form of communications with transmission occurring only in one direction Half Duplex allows traffic to travel in both directions but only one way at a time In Full Duplex operation data travels in both directions at the same time Most RS485 communications use the half duplex mode because only a single pair of wires need to be used and installation costs are dramatically reduced The cards also support the option of locally echoing the characters back to the transmitter RTS and Auto Transceiver Control In RS485 communications the driver must be enabled a
6. be shared in a party line mode As many as 32 driver receiver pairs can share a two wire party line network Many characteristics of the drivers and receivers are the same as in the RS422 Standard One difference is that the common mode voltage limit is extended and is 12V to 7V Since any driver can be disconnected or tristated from the line it must withstand this common mode voltage range while in the tristate condition 2 Manual PCI COM 2S RS485 Two Wire Multidrop Network The following illustration shows a typical multidrop or party line network Note that the transmission line is terminated on both ends of the line but not at drop points in the middle of the line TERMINATION RESISTORS AT BOTH ENDS ONLY 15 d PA S N IK ENA3L RX i 4 7 IX ENAHI RX ENAaLE Figure A 1 Typical RS485 Two Wire Multidrop Network RS485 Four Wire Multidrop Network An RS485 network can also be connected in a four wire mode In a four wire network it s necessary that one node be a master node and all others be slaves The network is connected so that the master communicates to all slaves and all slaves communicate only with the master This has advantages in equipment that uses mixed protocol communications Since the slave nodes never listen to another slave s response to the master a slave node cannot reply incorrectly 22 Manual PCI COM 2S Customer Comments If you experien
7. 15 200 baud asynchronous A faster range of rates up to 460 800 baud is achieved by jumper selection on the card Type 16550 buffered UART Caution The OUT2 bit of the UART must be set low for proper interrupt driven communication This bit enables or disables the interrupts and the card will not communicate if the bit is pulled high RS232 Drivers Device 75C185 Quad Line Transceivers Output Voltage 6VDC minimum current limited to 10 mA Receiver threshold 1 5V high 0 75 low Maximum input 30VDC RS422 RS485 Differential Communication Mode e Multipoint Compatible with RS422 and RS485 specifications Up to 32 drivers and receivers allowed on line Serial communications ACE used is type 16550 Driver Receivers used are type 75ALS180 Receiver Input Sensitivity 200 mV differential input Common Mode Rejection 12V to 7V e Transmitter Output Drive Capability 60 mA Environmental Operating Temperature Range 0 C to 60 C Storage Temperature Range 50 C to 120 C Humidity 5 to 95 non condensing 7 Manual PCI COM 2S 2 m O a 0 LE 2 a z k Power Required 5VDC at 125 mA typical 12VDC at 5 mA typical 12VDC at 5 mA typical 750 mW total power consumption Size 6 1 2 long 165 mm by 3 7 8 98 mm OSCILLATOR PCI INTERFACE TRANSCEIVER DB9 CHIP RTS AUTO AUTO RTS CIRCUITRY Figure 1 1 Block Diagram Only one serial ch
8. 2 8 4000 ft 38400 3 12 4000 ft 28800 4 16 4000 ft 19200 6 24 4000 ft 14400 8 32 4000 ft 9600 12 48 Most Common 4000 ft 4800 24 96 4000 ft 2400 48 192 4000 ft 1200 96 384 4000 ft These are theoretical maximums based on typical conditions and good quality cables RS232 communication lines have a maximum length of 50 feet regardless of speed Table 5 1 Baud Rate Divisors In C the code to set the chip to 9600 baud is outportb BASEADDR 0x0C outportb BASEADDR 1 0 The second initializing step is to set the Line Control Register at Base Address 3 This register defines word length stop bits parity and the DLAB Bits 0 and 1 control word length and allow word lengths from 5 to 8 bits Bit settings are extracted by subtracting 5 from the desired word length Bit 2 determines the number of stop bits There can be either one or two stop bits If Bit 2 is set to 0 there will be one stop bit If Bit 2 is set to 1 there will be two stop bits Bits 3 through 6 control parity and break enable They are not commonly used for communications and should be set to zeroes Bit 7 is the DLAB discussed earlier It must be set to zero after the divisor is loaded or else there will be no communications The C command to set the UART for an 8 bit word no parity and one stop bit is outportb BASEADDR 3 0x03 The third step of the initialization sequence is to set the Modem Control Register at Base Address 4 Bit 1
9. annel shown 8 Manual PCI COM 2S Chapter 2 Installation A printed Quick Start Guide QSG is packed with the card for your convenience If you ve already performed the steps from the QSG you may find this chapter to be redundant and may skip forward to begin developing your application The software provided with this card is on CD and must be installed onto your hard disk prior to use To do this perform the following steps as appropriate for your operating system Configure Card Options via Jumper Selection Before installing the card into your computer carefully read Chapter 3 Option Selection of this manual then configure the card according to your requirements and protocol RS 232 RS 422 RS 485 4 wire 485 etc Our Windows based setup program can be used in conjunction with Chapter 3 to assist in configuring jumpers on the card as well as provide additional descriptions for usage of the various card options such as termination bias baud rate range RS 232 RS 422 RS 485 etc CD Software Installation The following instructions assume the CD ROM drive is drive D Please substitute the appropriate drive letter for your system as necessary DOS 1 Place the CD into your CD ROM drive 2 Type JE to change the active drive to the CD ROM drive 3 Type to run the install program 4 Follow the on screen prompts to install the software for this board 1 Place the CD into your CD ROM drive
10. by ACCES which is found to be defective will be repaired or replaced subject to the following considerations Terms and Conditions If a unit is suspected of failure contact ACCES Customer Service department Be prepared to give the unit model number serial number and a description of the failure symptom s We may suggest some simple tests to confirm the failure We will assign a Return Material Authorization RMA number which must appear on the outer label of the return package All units components should be properly packed for handling and returned with freight prepaid to the ACCES designated Service Center and will be returned to the customer s user s site freight prepaid and invoiced Coverage First Three Years Returned unit part will be repaired and or replaced at ACCES option with no charge for labor or parts not excluded by warranty Warranty commences with equipment shipment Following Years Throughout your equipment s lifetime ACCES stands ready to provide on site or in plant service at reasonable rates similar to those of other manufacturers in the industry Equipment Not Manufactured by ACCES Equipment provided but not manufactured by ACCES is warranted and will be repaired according to the terms and conditions of the respective equipment manufacturer s warranty General Under this Warranty liability of ACCES is limited to replacing repairing or issuing credit at ACCES discretion for any products which are proved to be d
11. ce any problems with this manual or just want to give us some feedback please email us at manuals accesio com Please detail any errors you find and include your mailing address so that we can send you any manual updates ACCES 1 0 PRODUCTS INC 10623 Roselle Street San Diego CA 92121 Tel 858 550 9559 FAX 858 550 7322 www accesio com 23 Manual PCI COM 2S
12. ceive Balanced Differential Signals The reason that RS422 and RS485 devices can drive longer lines with more noise immunity than RS232 devices is that a balanced differential drive method is used In a balanced differential system the voltage produced by the driver appears across a pair of wires A balanced line driver will produce a differential voltage from 2 to 6 volts across its output terminals A balanced line driver can also have an input enable signal that connects the driver to its output terminals If the enable signal is OFF the driver is disconnected from the transmission line This disconnected or disabled condition is usually referred to as the tristate condition and represents a high impedance RS485 drivers must have this control capability RS422 drivers may have this control but it is not always required A balanced differential line receiver senses the voltage state of the transmission line across the two signal input lines If the differential input voltage is greater than 200 mV the receiver will provide a specific logic state on its output If the differential voltage input is less than 200 mV the receiver will provide the opposite logic state on its output The maximum operating voltage range is from 6V to 6V allowing for voltage attenuation that can occur on long transmission cables A maximum common mode voltage rating of 7V provides good noise immunity from voltages induced on the twisted pair lines The sig
13. efective during the warranty period In no case is ACCES liable for consequential or special damage arriving from use or misuse of our product The customer is responsible for all charges caused by modifications or additions to ACCES equipment not approved in writing by ACCES or if in ACCES opinion the equipment has been subjected to abnormal use Abnormal use for purposes of this warranty is defined as any use to which the equipment is exposed other than that use specified or intended as evidenced by purchase or sales representation Other than the above no other warranty expressed or implied shall apply to any and all such equipment furnished or sold by ACCES 3 Manual PCI COM 2S Table of Contents Chapter 1 5 Specification duis RA RE eA DERE Md 7 Figure 1 1 Block Diagram Only one serial channel shown essem 8 Chapter 2 InstallatiOh 5 9 Chapter 3 Option Selection 11 Figure 3 1 Simplified Termination Schematic sss enne 11 Figure 3 2 Option Selection eene nennen 13 Chapter 4 Address Selection 14 Chapter 5 Programming 5o poe ERU enue Resta DEO
14. en installing or removing your interrupt handler to avoid writing the wrong interrupt disabling the wrong interrupt or turning interrupts off for too long a period The handler would first read the Interrupt Identification Register at Base Address 2 If the interrupt is for Received Data Available the handler then reads the data If no interrupt is pending control exits the routine A sample handler written in C is as follows readback inportb BASEADDR 2 if readback amp 4 Readback will be set to 4 if data are available data i inportob BASEADDR outportb 0x20 0x20 Write EOI to 8259 Interrupt Controller return Transmission The Auto feature of the card automatically enables the transmitter when data are ready to send so no software enabling is required The following software example is for non Auto operation First the RTS line should be set high by writing a 1 to Bit 1 of the Modem Control Register at Base Address 4 The RTS line is used to toggle the transceiver from receive mode to transmit mode and vice versa It is not carried out on the line in RS485 and is not used for handshaking Similarly the CTS line is not used in RS485 and should always be enabled by installing a jumper as described earlier After the above is done the card is ready to send data To transmit a string of data the transmitter must first check Bit 5 of the Line Status Register at Base Address 5 That bit is the transmitter holding re
15. gister empty flag If it is high the transmitter has sent the data The process of checking the bit until it goes high followed by a write is repeated until no data remains After all data has been transmitted the RTS bit should be reset by writing a 0 to Bit 1 of the Modem Control Register 17 Manual PCI COM 2S The following C code fragment demonstrates this process outportb BASEADDR 4 inporto BASEADDR 4 0x02 Set RTS bit without altering states of other bits while data i While there is data to send while inporto BASEADDR 5 amp 0 20 Wait until transmitter is empty outportb BASEADDR data i j outportb BASEADDR 4 inporto BASEADDR 4 amp 0xFD Reset RTS bit without altering states of other bits Caution The OUT2 bit of the UART must be set low for proper interrupt driven communication This bit enables or disables the interrupts and the card will not communicate if the bit is pulled high 18 Manual PCI COM 2S Chapter 6 Connector Pin Assignments The popular 9 pin D subminiature connector is used for interfacing to communication lines The connector is equipped with 4 40 threaded standoffs female screw lock to provide strain relief DB 9 Male Pin No 5232 Functions RS422 485 Functions 4 DTR Data Terminal Ready output 6 DSR Data Set Ready input 7 RISReqesttoSend oupu 8 CTSClearto Send inp 9 RI Ring Indicator
16. he CMOS setup program of your system and verify that the PCI plug and play option is set appropriately for your system Systems running Windows 95 98 2000 XP 2003 or any other PNP compliant operating system should set the CMOS option to OS Systems running under DOS Windows NT Windows 3 1 or any other non PNP compliant operating system should set the PNP CMOS option to BIOS or Motherboard Save the option and continue booting the system 9 Most computers should auto detect the card depending on the operating system and automatically finish installing the drivers 10 Run PClfind exe to complete installing the card into the registry for Windows only and to determine the assigned resources 11 Run one of the provided sample programs that was copied to the newly created card directory from the CD to test and validate your installation eos The base address assigned by BIOS or the operating system can change each time new hardware is installed into or removed from the computer Please recheck PCIFind or Device Manager if the hardware configuration is changed Software you write can automatically determine the base address of the card using a variety of methods depending on the operating system In DOS the PCNSOURCE directory shows the BIOS calls used to determine the address and IRQ assigned to installed PCI devices In Windows the Windows sample programs demonstrate querying the registry entries created by PCIFind a
17. ions can be used In particular CreateFile and CloseHandle for opening and closing a port SetupComm SetCommTimeouts GetCommState and SetCommState to set and change a port s settings ReadFile and WriteFile for accessing a port See the documentation for your chosen language for details Under DOS the process is very different The remainder of this chapter describes DOS programming Initialization Initializing the chip requires knowledge of the UART s register set The first step is to set the baud rate divisor You do this by first setting the DLAB Divisor Latch Access Bit high This bit is Bit 7 at Base Address 3 In C code the call would be outportb BASEADDR 3 0x80 You then load the divisor into Base Address 0 low byte and Base Address 1 high byte The following equation defines the relaionship between baud rate and divisor Desired Baud Rate UART clock frequency 32 divisor When the BAUD jumper is in the X1 position the UART clock frequency is 1 8432MHz When the jumper is in the X4 position the clock frequency is 7 3728 MHz The following table lists popular divisor frequencies Note that there are two columns to consider depending on the position of the BAUD jumper 15 Manual PCI COM 2S Baud Rate Divisor x1 Divisor x4 Max Diff Cable Length 460800 1 550 ft 230400 2 1400 ft 153600 3 2500 ft 115200 1 4 3000 ft 57600
18. is the Request to Send RTS control bit This bit should be left low until transmission time Note When operating in the automatic RS485 mode the state of this bit is not significant Bits 2 and 3 are user designated outputs Bit 2 may be ignored on this card Bit 3 is used to enable interrupts and should be set high if an interrupt driven receiver is to be used The final initialization step is to flush the receiver buffers You do this with two reads from the receiver buffer at Base Address 0 When done the UART is ready to use 16 Manual PCI COM 2S Reception Reception can be handled in two ways polling and interrupt driven When polling reception is accomplished by constantly reading the Line Status Register at Base Address 5 Bit of this register is set high whenever data are ready to be read from the chip A simple polling loop must continuously check this bit and read in data as it becomes available The following code fragment implements a polling loop and uses a value of 13 ASCII Carriage Return as an end of transmission marker do while inporto BASEADDR 5 amp 1 Wait until data ready data i inportb BASEADDR while data i 13 Reads the line until null character rec d Interrupt driven communications should be used whenever possible and is required for high data rates Writing an interrupt driven receiver is not much more complex than writing a polled receiver but care should be taken wh
19. nal ground line connection is necessary in order to keep 20 Manual PCI COM 2S the common mode voltage within that range The circuit may operate without the ground connection but may not be reliable Parameter Conditions min Max Driver Output Voltage unloaded oo S wj Driver Output Voltage loaded TERM 2V ee ee jupes 12 soa ema ELT E 3 Receiver Sensitivity Receiver Common Mode Voltage Range Receiver Input Resistance Table 2 RS422 Specification Summary 500 200 mV Driver Output Rise Time To prevent signal reflections in the cable and to improve noise rejection in both the RS422 and RS485 mode the receiver end of the cable should be terminated with a resistance equal to the characteristic impedance of the cable The exception is when the line is driven by an RS422 driver that is never tristated or disconnected from the line In this case the driver provides a low internal impedance that terminates the line at that end Note You do not have to add a terminator resistor to your cables when you use the 25 card Termination resistors for the and RX lines are provided on the card and are placed in the circuit when you install the TERM jumpers Moreover installing the BIAS jumpers properly biases these lines See the Option Selection section of this manual RS485 Data Transmission The RS485 Standard allows a balanced transmission line to
20. nd NTIOPCI SYS during boot up to determine this same information 10 Manual PCI COM 2S Chapter 3 Option Selection Operation of the serial communications section is determined by jumper installation as described in the following paragraphs Locations of the jumpers are shown in Figure 3 2 Option Selection at the end of this section of the manual 232 422 Jumpers must be installed in these blocks for each COM port The function of the 232 and 422 jumpers is to configure the port for single ended RS232 communications or differential RS422 485 mode communications Echo This jumper enables local echoing of transmitted characters back to the receiver It is used to confirm locally that a character was transmitted and may be installed for two wire half duplex RS485 mode Auto or RTS Only one jumper may be installed for each COM port These jumpers select either the AUTOMATIC or RTS line control modes for RS485 operation To operate with Windows programs select AUTOMATIC AN BIAS IK o RX LD 120Q 0 1 UF IK Q BIAS Figure 3 1 Simplified Termination Schematic 11 Manual PCI COM 2S Terminations and Bias A transmission line should be terminated at the receiving end in its characteristic impedance Installing a jumper at the location labeled TERM applies a 1200 load across the input for RS422 mode and across the transmit receive input output for RS485 operation In RS485 operations where there are multi
21. nd disabled as needed allowing all cards to share a two wire or four wire cable These cards have two methods of controlling the driver automatic Auto and request to send RTS control With automatic control the driver is enabled when data is transmitted The driver remains enabled for the transmission time of one character and then is disabled The cards automatically adjust their timing to the baud rate of the data Note For use with Windows programs in half duplex mode card must be operated in the Auto mode Under RTS control your software must set the RTS bit to a logic 1 to enable the driver and logic 0 to disable the driver The receiver is also normally disabled during RS485 transmissions See the Option Selection section for details on setting the Auto and RTS modes and for enabling or disabling local echoing of characters In normal RS485 communication the echo is turned off to prevent data being echoed back CE Mark If your card is CE marked it meets the requirements of EN50081 1 1992 Emissions EN50082 1 1992 Immunity and EN60950 1992 Safety 6 Manual PCI COM 2S Specification Communications Interface e Connection 9 pin male D sub connectors Serial Ports Shielded male D sub 9 pin IBM AT style connectors compatible with RS232 RS422 and RS485 specifications e Character length 5 6 7 or 8 bits e Parity Even odd or none Stop Interval 1 1 5 or 2 bits Serial Data Rates Up to 1
22. nd the ability to support multiple devices on a single party line The RS485 specification defines a maximum of 32 devices on a single line The number of devices served on a single line can be expanded by use of repeaters RS485 and RS422 Balanced Mode Operation The cards support RS422 and RS485 modes which use differential balanced drivers for increased range and noise immunity The card also has capability to add bias voltages and to add load resistors to terminate the communications lines RS485 communications requires that one transmitter supply a bias voltage to ensure a known zero state when all transmitters are off Also receiver inputs at each end of the network should be terminated to eliminate ringing These cards support these options by means of jumpers on the card See the Option Selection section of this manual for more details COM Port Compatibility Type 16550 UARTSs are used as the Asynchronous Communication Element ACE These include a 16 byte transmit receive FIFO buffer to protect against lost data in multitasking operating systems while maintaining 100 compatibility with the original IBM serial port PCI bus architecture allows addresses between 0000 and FFF8 hex to be assigned to the cards PCIFind EXE is a utility provided to determine the base addresses assigned by the system A crystal oscillator is located on the card This oscillator permits selection of baud rates up to 115 200 Rates up to 460 800 baud
23. ple terminals only the RS485 ports at each end of the network should have terminating resistors as described above Also for RS485 operation there must be a bias on the RX and RX lines If the card is to provide that bias install jumpers at the locations labeled BIAS CLK X1 and CLK X4 Placement of these jumpers controls baud rate CLK X1 permits baud rates up to 115 2K Baud and CLK X4 permits baud rates up to 460 8K Baud Data Cable Wiring When two pin numbers are joined together with a amp those pins are wired together in the external cable Simplex 422 x5 2 wire Receive Only Simplex 422 x5 2 wire Transmit Only Half Duplex 422 x5 AUTO or RTS 2 Wire no echo Half Duplex 422 x5 ECHO AUTO or RTS 2 Wire with echo Full Duplex 422 x5 m m EECEN Preferred RS 485 mode 12 Manual PCI COM 2S Interrupts In addition to standard interrupt levels IRQ2 through IRQ7 the card also supports higher interrupts IRQ10 through IRQ15 except IRQ13 reserved by other hardware Use PCIFind EXE to determine the IRQ that was assigned to the card by the BIOS or Operating System Alternatively in Windows 95 the Device Manager can be used The card is listed under the Data Acquisition class Selecting the card clicking Properties then selecting the Resources tab will show the base addresses and IRQ assigned to the card
24. pu eaae 15 Table 5 1 Baud Rate DIVISOIS nennen nennen snis 16 Chapter 6 Connector Pin 19 Table 6 1 Connector Pin Assignments sssssesssessseee nene emen 19 Appendix A Application 20 Table A 1 Connections Between Two RS422 Devices 20 Table 2 RS422 Specification Summary sse emen nnne nnne 21 Figure A 1 Typical RS485 Two Wire Multidrop 22 4 Manual PCI COM 2S Chapter 1 Introduction The card was designed for use in PCI Bus computers and provides two serial ports for effective communication in the most common protocols The card is 6 5 inches long 165 mm and may be installed in any 5 volt PCI slot in IBM or compatible computers Multi Protocol Operation These are multi protocol serial cards that support RS232 RS422 or RS485 communications RS232 is the most common form of serial communication but is an unbalanced single line system unsuitable for distances over 50 feet RS422 is an extension of RS232 but uses differential or balanced line drivers to improve noise immunity and increase the maximum distance to 4000 feet RS485 improves on RS422 with switchable transceivers a
25. tility will display a list of all of the cards detected on the PCI bus the addresses assigned to each function on each of the cards and the respective IRQs and DMAs if any allotted Alternatively some operating systems Windows 95 98 2000 can be queried to determine which resources were assigned In these operating systems you can use either PCIFind or the Device Manager utility from the System Properties Applet of the control panel These cards are installed in the Data Acquisition class of the Device Manager list Selecting the card then clicking Properties then selecting the Resources Tab will display a list of the resources allocated to the card PCIFind uses the Vendor ID and the device ID to search for your card then reads the base address and IRQ assigned If you want to determine the base address and IRQ assigned use the following information The Vendor ID code for this card is 494F ASCII for I O The Device ID code for the card is 10DO PCI supports 64 K of address space so your card s addresses may be located anywhere in the 0000 to FFF8 hex range 14 Manual PCI COM 2S Chapter 5 Programming Sample Programs There are sample programs provided with the card in C Pascal QuickBASIC and several Windows languages DOS samples are located in the DOS directory and Windows samples are located in the WIN32 directory Windows Programming The card installs into Windows as COM ports Thus the Windows standard API funct
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