MAY 2002 IC973C RS-232/422/485 2-Port PCI Card, Opto-Isolated CUSTOMER SUPPORT INFORMATION Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500) FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.
FCC AND IC RFI STATEMENTS FEDERAL COMMUNICATIONS COMMISSION and INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS Class B Digital Device. This equipment has been tested and found to comply with the limits for a Class B computing device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. • Consult an experienced radio/TV technician for help. CAUTION Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
EU DECLARATION OF CONFORMITY EUROPEAN UNION DECLARATION OF CONFORMITY This equipment complies with the requirements of the European EMC Directive 89/336/EEC.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY STATEMENT INSTRUCCIONES DE SEGURIDAD 1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. 2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura. 3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas. 4.
NOM STATEMENT 10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de calor como radiadores, registros de calor, estufas u otros aparatos (incluyendo amplificadores) que producen calor. 11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo del tipo descrito en el instructivo de operación, o como se indique en el aparato. 12. Precaución debe ser tomada de tal manera que la tierra fisica y la polarización del equipo no sea eliminada. 13.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED TRADEMARKS USED IN THIS MANUAL IBM and PS/2 are registered trademarks of International Business Machines Corporation. Windows and Windows NT are either registered trademarks or trademarks of Microsoft Corporation in the United States and other countries. Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.
CONTENTS Contents Chapter Page 1. Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2 What the Package Includes . . . . . . . . . . . . 11 2.3 Factory-Default Settings. . . . . . . . . . . . . . . 12 2.4 Technical Description . . . . . . . . . . . . . . . . 12 2.5 Connector Pin Assignments . . . . . . . . . . . 13 3. Card Setup . . .
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED Contents (continued) Chapter Page Appendix A. Troubleshooting . . . . . . . . . . . . . . . . . 23 A.1 Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 A.2 Calling Black Box. . . . . . . . . . . . . . . . . . . . 24 A.3 Shipping and Packaging . . . . . . . . . . . . . . 25 Appendix B. Electrical Interfaces . . . . . . . . . . . . . . 26 B.1 RS-232 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 B.2 RS-422 . . . . . . . . . .
CHAPTER 1: Specifications 1. Specifications UART: 16850 Connector: (2) DB9 male Interface: RS-232/422/485, Opto-Isolated Temperature Tolerance: Operating: 32 to 122°F (0 to 50°C); Storage: -4 to +158°F (-20 to +70°C) Relative Humidity: 10 to 90%, noncondensing MTBF: Greater than 150,000 hours (calculated) Power: +5 VDC, 480 mA Size: 3.9"H x 6.5"W (9.9 x 16.5 cm), excluding goldfingers; 4.2"H x 6.5"W (10.7 x 16.5 cm), including goldfingers Weight: 4.6 oz. (130.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED 2. Introduction 2.1 Overview The RS-232/422/485 2-Port PCI Card, Opto-Isolated is a two-channel isolated PCI Bus serial I/O adapter for the PCs and compatibles. Using a 16850 UART with its industry-leading 128-byte FIFOs, it provides two fieldselectable RS-232/422/485 serial ports that support data rates up to 460.8 kbps (RS-422/485). Configure the PCI Card as RS-232 for standard serial COM: port requirements.
CHAPTER 2: Introduction In both RS-232 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 means that the standard COM: driver can be used for RS-485 communications. Our on-board hardware automatically handles the RS485 driver enable. 2.2 What the Package Includes The PCI Card is shipped with the following items.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED 2.3 Factory-Default Settings When shipped from the factory, the PCI Card’s DB9 ports are configured as RS-422. To install the PCI Card using factory-default settings, refer to Chapter 4. 2.
CHAPTER 2: Introduction 2.5 Connector Pin Assignments Table 2-1. RS-232 signals (DB9 male). Signal Name TD RTS GND RD CTS Transmit Data Request to Send Ground Receive Data Clear to Send Pin # Mode 3 7 5 2 8 Output Output — Input Input NOTE These assignments meet EIA/TIA/ANSI-232E DTE standards. Table 2-2. RS-422/485/530 pin assignments (DB9 male).
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED 3. Card Setup 3.1 Electrical Interface Selection The RS-232/422/485 2-Port PCI Card can be used as RS-232, RS-422, or RS-485. This is selectable via DIP-switches SW1 and SW2. Please use the following examples to configure your PCI Card. 1 2 3 T P P L L E Figure 3-1. RS-232. 1 2 3 T P P Figure 3-2. RS-422.
CHAPTER 3: Card Setup 1 2 3 T P P L L E Figure 3-3. RS-485 4-wire with echo. 1 2 3 T P P L L E Figure 3-4. RS-485 2-wire with echo. 1 2 3 T P P L L E Figure 3-5. RS-485 2-wire without echo.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED 3.2 Line Termination Typically, each end of the RS-485 bus must have line-terminating resistors (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. Switches SW1 and SW2 allow you to customize this interface to their specific requirements. Each switch position corresponds to a specific portion of the interface.
CHAPTER 3: Card Setup 3.3 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 tristated. The output modem control signal Request To Send (RTS) is typically used to control the state of the driver.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED 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. RS-485 Auto Enabled RS-232/422 Default SW3 SW3 SW4 SW4 Figure 3-6. RS-485 Enable modes. 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.
CHAPTER 3: Card Setup 3.4 Clock Modes The PCI Card uses a unique clocking option that allows you to select from “divide by 4” and “divide by 1” clocking modes. These modes are selected at switches SW3 and SW4. (See Appendix E for switch locations.) To select the Baud rates commonly associated with COM: ports (that is, 2400, 4800, 9600, 19.2, … 115.2 kbps), set switch-position 2 to the On position (silk-screen “D4”). To select the maximum data rate (460.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED 3.5 Baud Rates and Divisors for D1 mode Table 3-2 shows some common data rates and the rates you should choose to match them if using the PCI Card in D1 mode. Table 3-2. Baud rates. For this Data Rate Choose this Data Rate 1200 bps 2400 bps 4800 bps 9600 bps 19.2 kbps 57.6 kbps 115.2 kbps 230.4 kbps 460.8 kbps 300 bps 600 bps 1200 bps 2400 bps 4800 bps 14.4 kbps 28.8 kbps 57.6 kbps 115.
CHAPTER 4: Installation 4. Installation 4.1 Operating System Installation 4.1.1 FOR WINDOWS USERS Start by choosing Install Software at the beginning of the CD. Choose Asynchronous COM: Port Software, SeaCOM. 4.1.2 OTHER OPERATING SYSTEMS Refer to the appropriate section of the Serial Utilities Software. 4.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED 4. Gently insert the PCI Card into the slot. Make sure that the Card is seated properly. 5. Replace the screw. 6. Replace the cover. 7. Connect the power cord. Installation is complete.
APPENDIX A: Troubleshooting Appendix A. Troubleshooting A.1 Tips Using the supplied software and following these simple steps can eliminate most common problems. 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. 2. Configure your PCI Card so that there is no conflict with currently installed adapters.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED 5. When running DOS or Windows 3.x, refer to the supplied software and this manual to verify that the PCI Card is configured correctly. This software contains an easy-to-use diagnostic program (SSD) that will verify if a card is configured properly. 6. For Windows 95/98/Me/2000 and Windows NT, the diagnostic tool “WinSSD” is installed in the SeaCOM folder on the Start Menu during the setup process.
APPENDIX A: Troubleshooting Before you do, make a record of the history of the problem. We will be able to provide more efficient and accurate assistance if you have a complete description, including: • the nature and duration of the problem. • when the problem occurs. • the components involved in the problem. • any particular application that, when used, appears to create the problem or make it worse. A.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED Appendix B. Electrical Interfaces B.1 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 or EIA/TIA-232. The IBM® PC computer defined the RS-232 port on a DB9 connector, and subsequently the EIA/TIA approved this implementation as the EIA/TIA-574 standard.
APPENDIX B: Electrical Interfaces B.2 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.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED B.3 RS-485 RS-485 is backwardly compatible with RS-422; however, it is optimized for partyline 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 (1219.2 m) and data rates up to 10 Mbps.
APPENDIX B: Electrical Interfaces modem control signals. RS-485 does not define a physical connector.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED Appendix C. Ground Loop Phenomenon C.1 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. C.
APPENDIX C: Ground Loop Phenomenon Figure C-1. PCI Card cabling example.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED Appendix D. Asynchronous Communication Serial data communication 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.
APPENDIX D: Asynchronous Communication Figure D-1. Asynchronous communication 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 referred to as (N)o parity.
RS-232/422/485 2-PORT PCI CARD, OPTO-ISOLATED transmitting and receiving ends. The communication parameters are baud rate, parity, number of data bits per character, and stop bits (that is, 9600, N, 8, 1).
APPENDIXAPPENDIX E: Board Layout Appendix E. Board Layout 3.9" (10.7 cm) 6.5" (16.5 cm) Figure E-1. Board Layout.
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