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Four Port RS-232 Serial Interface
CUSTOMER
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
SUPPORT
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
INFORMATION
Web site: www.blackbox.com • E-mail: info@blackbox.com
JUNE 2000
IC111C
IC181C
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Summary of Contents for Black Box IC111C
- Page 1 Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 SUPPORT Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 INFORMATION Web site: www.blackbox.com • E-mail: info@blackbox.com...
- Page 2 FOUR PORT RS-232 SERIAL INTERFACE FEDERAL COMMUNICATIONS COMMISSION INDUSTRY CANADA RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates, uses, and can radiate radio frequency energy a nd if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication. It has been tested and found to comply with the limits for a Class A computing device in accordance with the specifications in Subpart J of Part 15 of FCC rules, which are designed to provide reasonable protection...
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Page 3: Table Of Contents
FOUR PORT RS-232 SERIAL INTERFACE Contents Chapter Page 1. Specifications....................1 2. Introduction ....................2 2.1 Overview....................2 2.2 What’s Included..................2 2.3 Features ....................3 2.4 Technical Description ................4 3. Address Selection ....................5 4. Option Selection .....................6 4.1 Port Enable/Disable................6 4.2 Interrupt-Mode Options ................8 5. -
Page 4: Specifications
CHAPTER 1: Specifications 1. Specifications Protocol — Asynchronous Number of Ports — 4 Speed — IC111C: Up to 115.2 Kbps; IC181C: 460.8 kbps and higher Operation — RS-232 Connectors — DB37M on card; (1) 3-ft. (0.9-m) DB37F-to-4x DB25M octopus cable, included Maximum Distance —... -
Page 5: Introduction
FOUR PORT RS-232 SERIAL INTERFACE 2. Introduction 2.1 Overview The Four Port RS-232 Serial Interface provides your PC system with four RS- 232 asynchronous ports. Connect to any device that uses the RS-232 protocol, such as modems, data-entry terminals, and plotters. The Serial Interface also includes a serial utility diskette with Seacom, a DOS interrupt and driver package. -
Page 6: Features
• Supports Interrupt Sharing—only one interrupt line required for multiple ports. • Supports any character set defined by binary notation. • 16550 UARTs (IC111C) or 16850 UARTs (IC181C) help ensure against data loss. • Faster baud rates—up to 115.2 Kbps. -
Page 7: Technical Description
COM1: through COM4:, or as any other I/O address (up to 3FF Hex), providing total compatibility with most communications software and languages. The Four Port RS-232 Serial Interface (IC111C) uses the 16550 UART chip, which features programmable baud rate, data format, interrupt control, and a 16-byte FIFO. -
Page 8: Address Selection
CHAPTER 3: Address Selection 3. Address Selection NOTE Be sure to set the address selections and jumper options before installation. Each serial port on the Four Port RS-232 Serial Interface occupies 8 con- secutive I/O locations. DIP switch SW4 sets the base address for Port 1, SW3 for Port 2, SW2 for Port 3, and SW1 for Port 4. -
Page 9: Option Selection
FOUR PORT RS-232 SERIAL INTERFACE 4. Option Selection NOTE Be sure to set the address selections and jumper options before installation. The board contains several jumper straps for each port which must be set for proper operation. 4.1 Port Enable/Disable Each port on the Four Port RS-232 can be enabled or disabled with switch position 8 on the DIP switch. - Page 10 CHAPTER 4: Option Selection Any two or more ports can share a common IRQ by placing the jumpers on the same IRQ setting, and setting the appropriate selections at E1. Consult your particular software for IRQ selection. If no interrupt is desired, remove the jumper.
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Page 11: Interrupt-Mode Options
FOUR PORT RS-232 SERIAL INTERFACE 4.2 Interrupt-Mode Options Jumper E5 selects the interrupt mode for each port. Each port must be set in the correct mode to ensure proper installation. “N” indicates the normal, single interrupt per port mode (Figure 4-2). “S” indicates the shared interrupt mode, which allows more than one port to access a single IRQ (Figure 4-4). - Page 12 CHAPTER 4: Option Selection Set jumper to “S” if you are using more than one Four Port RS-232 Serial Interface in a bus or you wish to remove the pull-down resistor completely for hardware compatibility. NOTE Setting the board in this configuration when it is not accompanied by a pull-down resistor will prevent the ports from triggering an interrupt.
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Page 13: Installation
Power down the computer and install the adapter as described in Section 5.2. If you wish to change any resources assigned to the adapter, refer to the help file installed in the Black Box folder in the Start, Programs menu. -
Page 14: Hardware Installation
CHAPTER 5: Installation 5.2 Hardware Installation The ISA Card can be installed in any of the PC expansion slots. The Card contains several jumper straps for each port that you must set for proper operation. 1. Turn off PC power. Disconnect the power cord. 2. -
Page 15: Appendix A: Circuit-Board Design
FOUR PORT RS-232 SERIAL INTERFACE Appendix A: Circuit-Board Design 3.9" 8.66" = User Configurable 4.2"... -
Page 16: Appendix B: Troubleshooting
APPENDIX B: Troubleshooting Appendix B. Troubleshooting By using the supplied serial utility diskette and following these simple steps, most common problems can be eliminated. 1) Identify all I/O adapters currently installed in your system. This includes your onboard serial ports, controller cards, and sound cards. The I/O address used by these adapters, as well as the IRQ (if any) should be identified. - Page 17 © Copyright 2000. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...
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