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Acces I/O products PCI-COM2S User Manual

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Acces I/O products PCI-COM2S User Manual

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Summary of Contents for Acces I/O products PCI-COM2S

  • Page 1 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...
  • Page 2 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...
  • Page 3 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.
  • Page 4 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 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.

  • Page 5: Table Of Contents

    Table of Contents Chapter 1: Introduction....................5 Specification ......................7 Figure 1-1: Block Diagram(Only one serial channel shown) ............... 8 Chapter 2: Installation....................9 Chapter 3: Option Selection ..................11 Figure 3-1: Simplified Termination Schematic .................. 11 Figure 3-2: Option Selection Map...................... 13 Chapter 4: Address Selection ..................

  • Page 6: Chapter 1: Introduction

    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.
  • Page 7 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.

  • Page 8: Specification

    Specification Communications Interface • I/O 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. • Character length: 5, 6, 7, or 8 bits. • Parity: Even, odd or none. •...
  • Page 9 • 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). Figure 1-1: Block Diagram(Only one serial channel shown) Manual PCI-COM-2S...

  • Page 10: Chapter 2: Installation

    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.
  • Page 11 Hardware Installation 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.

  • Page 12: Chapter 3: Option Selection

    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.
  • Page 13 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 120Ω load across the input for RS422 mode and across the transmit/receive input/output for RS485 operation. In RS485 operations, where there are multiple terminals, only the RS485 ports at each end of the network should have terminating resistors as described above.
  • Page 14 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.

  • Page 15: Chapter 4: Address Selection

    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.

  • Page 16: Chapter 5: Programming

    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.
  • Page 17 Baud Rate Divisor x1 Divisor x4 Max Diff. Cable Length* 460800 550 ft 230400 1400 ft 153600 2500 ft 115200 3000 ft 57600 4000 ft 38400 4000 ft 28800 4000 ft 19200 4000 ft 14400 4000 ft 9600 48 – Most Common 4000 ft 4800 4000 ft...
  • Page 18 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 0 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.
  • Page 19 The following C code fragment demonstrates this process: outportb(BASEADDR +4, inportb(BASEADDR +4)|0x02); /*Set RTS bit without altering states of other bits*/ while(data[i]); /*While there is data to send*/ while(!(inportb(BASEADDR +5)&0x20)); /*Wait until transmitter is empty*/ outportb(BASEADDR,data[i]); i++; outportb(BASEADDR +4, inportb(BASEADDR +4)&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.

  • Page 20: 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. RS232 Functions RS422/485 Functions DCD Data Carrier Detect (Input) Rx- Receive Data RD Receive Data (input) Tx+ Transmit Data...

  • Page 21: 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. Second, many RS232 errors are the result of noise induced on the cables.
  • Page 22 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) Driver Output Voltage (loaded) TERM jumpers in Driver Output Resistance 50Ω Driver Output Short-Circuit Current +150 mA Driver Output Rise Time 10% unit interval...
  • Page 23 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 24 Customer Comments If you experience 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. 10623 Roselle Street, San Diego CA 92121 Tel.
  • Page 25 Artisan Technology Group is your source for quality new and certified-used/pre-owned equipment SERVICE CENTER REPAIRS WE BUY USED EQUIPMENT • FAST SHIPPING AND DELIVERY Experienced engineers and technicians on staff Sell your excess, underutilized, and idle used equipment at our full-service, in-house repair center We also offer credit for buy-backs and trade-ins •...