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ICS RS422I-PA Series Product Manual

Serial communications card
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RS422I-PA Series
Product Manual
MANUAL NUMBER : 00650-519-1B

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Summary of Contents for ICS RS422I-PA Series

  • Page 1 RS422I-PA Series Product Manual MANUAL NUMBER : 00650-519-1B...
  • Page 2 Support Library. Thank you. The information in this document is provided for reference only. ICS Advent does not assume any liability arising from 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 ICS Advent, nor the rights of others.
  • Page 3 The limited warranty is void if the product has been subjected to alteration, neglect, misuse, or abuse; if any repairs have been attempted by anyone other than ICS Advent or its authorized agent; or if the failure is caused by accident, acts of God, or other causes beyond the control of ICS Advent or the manufacturer.
  • Page 4 Limitation of Liability In no event shall ICS Advent be liable for any defect in hardware, software, loss, or inadequacy of data of any kind, or for any direct, indirect, incidental, or consequential damages in connection with or arising out of the performance or use of any product furnished hereunder.
  • Page 5 Use caution when servicing any electrical component. We have tried to identify the areas which may pose a Caution or Warning condition in this manual; however, ICS Advent does not claim to have covered all situations which might require the use of a Caution or Warning.

  • Page 6: Table Of Contents

    Table of Contents Chapter 1: Introduction ..................... 1-1 Multipoint Opto-isolated Communications ..................1-1 COM Port Compatibility ........................1-1 Line Bias and Termination ........................1-1 Auto and Manual Transceiver Control ....................1-2 Communication Modes ........................1-2 Specifications ............................ 1-3 Chapter 2: Installation ....................2-1 CD Installation ...........................
  • Page 7 List of Figures Figure 1-1: RS422I-PA Block Diagram ..................... 1-4 Figure 3-1: Simplified Schematic - Two-Wire and Four-Wire Connection ..........3-2 Figure 3-2: RS422I-PA Option Selection Map ..................3-4 Figure A-1: Typical RS485 Two-Wire Multidrop Network ................A-3 List of Tables Table 4-1: Standard Address Assignments for 286/386/486 Computers ............

  • Page 8: Chapter 1: Introduction

    Chapter 1: Introduction The card is five inches long and should be installed in either long or short slots of IBM PC/XT/AT or compatible computers. If installed in an eight-bit slot, the high interrupts (IRQ 10-15) will not be available to the RS422I-PA. Multipoint Opto-isolated Communications The RS422I-PA serial communications card was designed for multipoint transmission on long communication lines in noisy environments using RS422 or RS485 differential line drivers.

  • Page 9: Auto And Manual Transceiver Control

    RS422I-PA Manual Auto and Manual Transceiver Control RS485 communications requires the transmitter driver to be enabled and disabled as needed, to allow all cards to share the communications line. The RS422I-PA card has automatic driver control. When the card is not transmitting, the receiver is enabled and the transmitter driver is disabled.

  • Page 10: Specifications

    Specification Communications Interface • Serial Ports: A shielded male D-sub 9-pin IBM AT style connector compatible with RS422 and RS485 specifications. Serial communications ACE used is type ST16C550. Transceivers used are type 75176. • Serial Data Rates: 50 to 115,200 baud in the 1X mode and up to 460,800 in the 4X mode.

  • Page 11: Figure 1-1: Rs422I-Pa Block Diagram

    RS422I-PA Manual Figure 1-1: RS422I-PA Block Diagram Manual 00650-519-1...

  • Page 12: Chapter 2: Installation

    Chapter 2: Installation The software provided with this card is contained on either one CD or multiple diskettes and must be installed onto your hard disk prior to use. To do this, perform the following steps as appropriate for your software format and operating system. Substitute the appropriate drive letter for your CD-ROM or disk drive where you see d: or a: respectively in the examples below.

  • Page 13: Directories Created On Hard Disk

    RS422I-PA Manual To copy the files on the master diskette to your hard disk, perform the following steps. Place the master diskette into a floppy drive. Change the active drive to the drive that has the diskette installed. For example, if the diskette is in drive A, type a:K.
  • Page 14 SAMPLES Samples for using ACCES32.DLL are provided in this directory. Using this DLL not only makes the hardware programming easier (MUCH easier), but also one source file can be used for both Windows 95/98 and WindowsNT. One executable can run under both operating systems and still have full access to the hardware registers.

  • Page 15: Installing The Card

    RS422I-PA Manual Findbase.exe DOS utility to determine an available base address for ISA bus , non-Plug-n-Play cards. Run this program once, before the hardware is installed in the computer, to determine an available address to give the card. Once the address has been determined, run the setup program provided with the hardware to see instructions on setting the address switch and various option selections.
  • Page 16 To Install the Card Turn off computer power. Remove the computer cover. Remove the blank I/O backplate. Install jumpers for selected options from either Chapter 3, Option Selection of this manual or the suggestions of our software SETUP program. Select the base address on the card for either Chapter 4, Address Selection of this manual or the suggestions of our FINDBASE setup software program.

  • Page 17: Chapter 3: Option Selection

    Chapter 3: Option Selection The following paragraphs describe the functions of the various jumpers on the RS422I-PA card. Refer to Figure 3-1, Option Selection Map for the locations of these jumpers on the card. Address Selection DIP switches A3 through A9 set the card's base address on the I/O bus. See the Address Selection section of this manual to follow.

  • Page 18: Figure 3-1: Simplified Schematic - Two-Wire And Four-Wire Connection

    RS422I-PA Manual Terminations and Bias A transmission line should be terminated at the receiving end in its characteristic impedance. Installing a jumper at the location labeled TERMOUT applies a 120 load in series with a 0.1 capacitor across the output (if desired) for RS422 mode and across the transmit/receive input/output for RS485 operation.
  • Page 19 Communication Modes and Cabling Options Cable Mode Card A Card B Simplex 2-wire Receive Only 1 ..2 9 ..3 Simplex 2-wire Transmit Only 2 ..9 3 .
  • Page 20 RS422I-PA Manual Figure 3-2: RS422I-PA Option Selection Map Switches • S1=COM Address (This illustration has COM at the COM 3 address.) Jumpers • 485 Selects RS485 with automatic-RTS mode. • 422 Selects RS422 Full duplex mode. • TERMOUT Load for RS485 mode or output load for RS422 mode. •...

  • Page 21: Chapter 4: Address Selection

    Chapter 4: Address Selection The RS422I-PA base address can be selected anywhere within the I/O bus address range 100-3F8 hex, providing that the address does not overlap with other functions. If in doubt, refer to the table below for a list of standard address assignments. (The primary and secondary binary synchronous communication ports are supported by the Operating System.) The base address locator program FINDBASE provided on CD (or diskettes) will assist you to select a base address that will avoid conflict with other installed computer resources.

  • Page 22: Table 4-2: Address Switch Setup

    RS422I-PA Manual I/O bus address switches are marked A3-A9. The following table lists switch label vs. the address line controlled and the relative weights of each. 1st Digit 2nd Digit Address Switch Settings Switch Label Address Line Controlled Decimal Weight Hexadecimal Weight Table 4-2: Address Switch Setup In order to read the address switch setup, assign a binary "1"...

  • Page 23: Chapter 5: Programming

    Chapter 5: Programming Sample Programs There are sample programs provided with the RS422I-PA 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. Card 1 Card 2 TRx- TRx+...

  • Page 24: Table 5-1: Baud Rate Divisors

    RS422I-PA Manual Baud Divisor Divisor Notes Max. Diff’l. Rate Cable Length* 460800 230400 153600 115200 375 ft. 57600 660 ft. 38400 920 ft. 28800 1165 ft. 19200 1620 ft. 14400 2050 ft. 9600 Most commonly used in industry 4000 ft. 4800 4000 ft.

  • Page 25: Reception

    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. This register controls functions on some cards. Bit 1 is the Request to Send (RTS) control bit. This bit should be left low until transmission time.

  • Page 26: Transmission

    RS422I-PA Manual Transmission RS485 transmission is simple to implement. The AUTO feature automatically enables the transmitter when data is ready to send so no software enabling procedure is needed. Page 5-4 Manual 00650-519-1...

  • Page 27: Chapter 6: Connector Pin Assignments

    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. Pin No. RS422 Four-Wire RS485 Two-Wire Rx- Receive Data TRx+ Tx+ Transmit Data (Output) Tx- Transmit Data...

  • Page 28: Appendix A: Application Considerations

    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 at. Second, many RS232 errors are the result of noise induced on the cables.

  • Page 29: Rs485 Data Transmission

    RS422I-PA Manual 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.

  • Page 30: Figure A-1: Typical Rs485 Two-Wire Multidrop Network

    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. 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.
  • Page 31 The technical documentation required to demonstrate this product meets the requirements of the EMC Directive and the Low Voltage Directive has been compiled by ICS Advent and is available for inspection by the relevant enforcement authorities. The CE mark was first applied in 2000.

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