MARCH 2000 IC110C IC174C Dual Port RS-232 Serial Interface CUSTOMER SUPPORT INFORMATION 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 Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.
DUAL PORT RS-232 SERIAL INTERFACE FEDERAL COMMUNICATIONS COMMISSION AND CANADIAN DEPARTMENT OF COMMUNICATIONS RADIO FREQUENCY INTERFERENCE STATEMENTS This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer’s instructions, may cause interference to radio communication.
DUAL PORT RS-232 SERIAL INTERFACE Contents Chapter Page 1. Specifications...................................................................................................1 2. Introduction ....................................................................................................2 2.1 Overview..................................................................................................2 2.2 What’s Included......................................................................................
CHAPTER 1: Specifications 1. Specifications Protocol — Asynchronous Number of Ports — 2 Speed — IC110C: Up to 115.2 Kbps; IC174C: 460.8 kbps and higher Operation — RS-232 Connectors — (2) DB9M Maximum Distance — 50 ft. (15.2 m) @ 19.2 Kbps with 2500 pF max. cable capacitance (lower capacitance will allow greater distances) Communications Chip — IC110C: 16550 UART; IC174C: 16950 UART MTBF — >150,000 hours MTTR — <0.
DUAL PORT RS-232 SERIAL INTERFACE 2. Introduction 2.1 Overview The Dual Port RS-232 Serial Interface provides your PC system with two RS232 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. Seacom allows data to be buffered, eliminating data loss in high-speed data transfers. It also allows more than 4 ports (256 max.
CHAPTER 2: Introduction 2.3 Features Listed below are the special features your Serial Interface offers. • Each port is independently addressable. • Eight interrupt options, including AT interrupts, for simple integration into existing systems. • IRQs can be shared or individually set for each port. • Supports Interrupt Sharing—only one interrupt line required for multiple ports. • Supports any character set defined by binary notation.
DUAL PORT RS-232 SERIAL INTERFACE 2.4 Technical Description The Dual Port RS-232 Serial Interface provides the PC/XT™/AT/80X86 computer with two additional serial ports for terminals, modems, printers, etc. The Dual Port RS-232 Serial Interface can be configured as COM1: through COM4:, or any other I/O address. The Dual Port RS-232 Serial Interface (IC110C) utilizes the same 16550 UART chip found in the IBM® asynchronous adapter. This chip features programmable baud rate, data format, and interrupt control.
CHAPTER 2: Introduction Pin Number Signal Name Mode 3 7 4 5 2 1 6 8 9 Transmit Data (TD) Request To Send (RTS) Data Term Ready (DTR) Ground (GND) Receive Data (RD) Data Carrier Detect (DCD) Data Set Ready (DSR) Clear To Send (CTS) Ring Indicator (RI) Output RS-232 Output RS-232 Output RS-232 –––––––––––– Input RS-232 Input RS-232 Input RS-232 Input RS-232 Input RS-232 5
DUAL PORT RS-232 SERIAL INTERFACE 3. Address Selection NOTE Be sure to set the address selections and jumper options before installation. Each serial port on the Dual Port RS-232 Serial Interface occupies 8 consecutive I/O locations. A DIP switch is used to set the base address for these locations. Be careful when selecting the base address as some selections conflict with existing PC ports. The following table shows several examples that usually do not cause a conflict.
CHAPTER 3: Address Selection you can determine the switch setting for a particular address by using the following illustration. The illustration shows the correlation between the DIP switch setting and the address bits used to determine the base address. In the figure below, the address 300 hex through 307 hex is selected (300 HEX =11 0000 0XXX in binary representation). Note that setting the switch ON (or closed) corresponds to a “0” in the address, while leaving it OFF (or open) corresponds to a “1.
DUAL 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. Port Enable/Disable Each port on the Dual Port RS-232 can be enabled or disabled with switch position 8 on the DIP switch. The port is enabled with the switch ON (or closed) and disabled when OFF (or open).
10 11 12 15 2 3 4 5 CHAPTER 4: Option Selection Figure 4-1. Header E1 and E2 (IRQ 4 selected). E4 M N E3 Headers E3 and E4 select the (normal) single-interrupt-per-board mode or the multi-interrupt mode, which allows you to share both interrupts on this card. The multi-interrupt mode also allows you to share the IRQ signal(s) with other cards that support multiple interrupts. Figure 4-2. Headers E3 and E4 in Normal Mode.
DUAL PORT RS-232 SERIAL INTERFACE 5. Installation IMPORTANT You MUST set up the operating system BEFORE you physically install the Card. 5.1 Installing the Adapter in Your Operating System If you are installing an ISA adapter in DOS, OS/2®, or QNX, please refer to the appropriate directory on one of the Serial Utilities Disks for instructions. 5.1.1 WINDOWS 3.
CHAPTER 5: Installation 4. Replace the screw. 5. Replace the cover. 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. Installation is complete.
DUAL PORT RS-232 SERIAL INTERFACE Appendix: Circuit-Board Design P2 C2 C1 C3 U2 SW1 U3 E1 E2 PORT1 PORT2 2 2 3 3 4 4 5 5 10 10 11 11 12 12 R1 15 15 U1 U4 C4 SW2 R2 P1 Y1 U5 U6 C6 C5 R3 M C7 N 1 1 U10 U9 E3 E4 U7 C8 1 14 12 J1 1 6 D1 R4 D2 R5 U6 C9 J2 1 6 5 9 J4 13 25 5 9 1 6 5 9 J3
P2 P2 P2 P2 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 P1 D6 D5 D4 D3 B23 B24 B25 B4 A2 A3 A4 A5 A6 A7 A8 A9 B14 B13 A29 A30 A31 B2 A11 A28 A27 A26 A25 A24 6 7 5 3 1 SW1 SW1 SW1 SW1 SW1 11 10 12 14 16 IRQ15 IRQ12 IRQ11 IRQ10 IRQ5 IRQ4 IRQ3 IRQ2 D7 D6 D5 D4 D3 D2 D1 D0 RD/ WR/ A2 A1 A0 RESET GND 4 SW1 13 PORT 1 2 SW1 15 AEN A3 A4 A5 A6 A7 A8 A9 A8 A6 A4 AEN A3 A5 A7 A9 BRD/ GND GND GND 3 4 5 6 7 8 9 2 1 19
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