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Black Box RS-485 manual

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Table of contents for the manual

  • Page 1

    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.com MARCH 200[...]

  • Page 2

    FCC AND IC ST A TEMENTS, TRADEMARKS FEDERAL COMMUNICA TIONS COMMISSION AND INDUSTR Y CANADA RADIO FREQUENCY INTERFERENCE ST A TEMENTS 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 com[...]

  • Page 3

    DUAL POR T RS-232 ↔ 422/485 SERIAL INTERF ACE NORMAS OFICIALES MEXICANAS (NOM) ELECTRICAL SAFETY ST A TEMENT 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 futu[...]

  • Page 4

    NOM ST A TEMENT 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. Los cables de la fuente de poder deben ser guiados de [...]

  • Page 5

    DUAL POR T RS-232 ↔ 422/485 SERIAL INTERF ACE Contents Chapter Page 1. Specifications...................................................................................................1 2. Introduction ....................................................................................................2 2.1 Overview ...............................[...]

  • Page 6

    1 CHAPTER 1: Specifications Protocol — Asynchronous Speed — IC113C: Up to 115.2 Kbps; IC175C: 460.8 kbps and higher Operation — RS-232 or RS-485/422, 2- or 4-wire (individually selectable on each port) Connectors — (2) DB9M Communications Chip — IC113C: 16550 UART; IC175C: 16950 UART MTBF — >150,000 hours MTTR — <0.25 hours Mate[...]

  • Page 7

    2 DUAL POR T RS-232 ↔ 422/485 SERIAL INTERF ACE 2.1 Overview If you need to operate RS-232, RS-422, or RS-485 devices from your PC, use the Dual Port RS-232/422/485 Serial Interface. Connect to any device that uses the RS-232 interface, such as modems, data-entry terminals, and plotters. This card allows you to configure two RS-232 ports, two RS-[...]

  • Page 8

    3 CHAPTER 2: Introduction 2.3 Features Listed below are the special features your Serial Interface offers. • Each port is independently addressable. • Eleven interrupt options, including AT interrupts, for simple integration into existing systems. • IRQs (2 [9], 3, 4, 5, 6, 7, 10, 11, 12, and 15) supported. • IRQs can be shared or individua[...]

  • Page 9

    4 DUAL POR T RS-232 ↔ 422/485 SERIAL INTERF ACE 2.4 T echnical Description The Dual Port RS-232/422/485 Serial Interface utilizes the same 16550 UART chip found in the IBM ® asynchronous adapter. This chip features programmable baud rate, data format, and interrupt control. Refer to the IBM Technical Reference for details on programming the chip[...]

  • Page 10

    5 CHAPTER 2: Introduction RS-485 RS-485 is backward-compatible with RS-422; however, it is optimized for multidrop 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 multidrop bus and selectively polled. Half-duplex two-wire commu[...]

  • Page 11

    6 DUAL POR T RS-232 ↔ 422/485 SERIAL INTERF ACE NOTE Be sure to set the address selections and jumper options before installation. Each serial port on the Dual Port RS-232/422/485 Serial Interface occupies 8 consecutive I/O locations. DIP switch SW1 sets the base address for Port 1, and DIP switch SW2 sets the address for Port 2. Be careful when [...]

  • Page 12

    7 CHAPTER 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 Dual Port RS-232/422/485 can be enabled or disabled with switch position 8 on the DIP switch. The por[...]

  • Page 13

    8 DUAL POR T RS-232 ↔ 422/485 SERIAL INTERF ACE Figure 4-1. Header E1 and E2 (IRQ 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 E9 and E10. Consult your particular software for IRQ selection. If no interrupt is desired, remove the jumper. NOTE IRQ[...]

  • Page 14

    9 CHAPTER 4: Option Selection Figure 4-2. Headers E9 and E10 in Nor mal Mode. Set jumpers to “N” for single interrupt mode. This setting is the normal setting for most applications. Set jumpers to “S” for shared interrupt mode for all ports sharing an IRQ except one. Set that port block for “M.” This provides the pull-down resistor circ[...]

  • Page 15

    10 DUAL POR T RS-232 ↔ 422/485 SERIAL INTERF ACE Figure 4-3. DB9 Handshake Loopback connections for RS-232 (shown from r ear or cable side of connector). 4.3 RS-422/485 Interface Options To select the RS-422/485 mode of operation, install DIP shunts in the sockets found at E6 and E7. E6 sets Port 1 and E7 sets Port 2. Figure 4-4 shows Headers E3 [...]

  • Page 16

    11 CHAPTER 4: Option Selection Figure 4-4. Headers E3 and E4, RS-485 Enable/Gr ound Selection. 4.4 Line T ermination Typically each end of the RS-422/485 bus must have line-terminating resistors. A 100-ohm resistor is across each RS-422/485 input, and a 1K-ohm pull-up/pull-down combination biases the receiver inputs. If more than two RS-485 nodes a[...]

  • Page 17

    12 DUAL POR T RS-232 ↔ 422/485 SERIAL INTERF ACE The Dual Port RS-232/422/485 can be installed in any of the PC expansion slots, except J8 on the original IBM XT ® and Portable. IMPOR T ANT You MUST set up the operating system BEFORE you physically install the Card. 5.1 Software Installation If you are installing an ISA adapter in DOS, OS/2 ® ,[...]

  • Page 18

    13 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. Remove the PC case cover. 3. Locate an available slot and remove the blank metal slot c[...]

  • Page 19

    14 DUAL POR T RS-232 ↔ 422/485 SERIAL INTERF ACE E6 E5 U13 E7 E8 U12 C9 C10 P1 P3 C8 U1 1 RP2 RP3 C7 U9 RP4 R8 U18 U8 R9 U6 U7 PORT1 PORT2 R5 R4 R4 E10 E9 D1 PORT1 PORT2 E2 E1 P2 P6 U2 C2 U1 R2 SW2 R1 SW1 C1 V1 PORT1 PORT2 C3 PORT1 PORT2 C1 C5 U4 U5 U3 C6 RP1 PORT2 E3 PORT1 E4 R6 R7 422/485 PORT 2 RS-232 PORT 2 RS-232 PORT 1 422/485 PORT 1 J1 POR[...]

  • Page 20

    15 P1 A11 AEN WR/ RD/ B4 D3 D5 A8 A6 A4 AEN A3 A5 A7 A9 2 4 6 8 11 13 15 17 P0 P1 P2 P3 P4 P5 P6 P7 U1 A9 A8 A7 A6 A5 A4 A3 15 13 11 10 12 14 16 SW1 SW1 SW1 SW1 SW1 SW1 SW1 2 4 6 7 5 3 1 P1 P1 P1 P1 P1 P1 P1 A22 A23 A24 A25 A26 A27 A28 P1 P1 P1 P1 B2 A31 A30 A29 P1 P1 B13 B14 RESET A0 A1 A2 D0 D1 D2 D3 D4 D5 D6 D7 A9 A8 A7 A6 A5 A4 A3 A2 P1 P1 P1 P[...]

  • Page 21

    16 DUAL POR T RS-232 ↔ 422/485 SERIAL INTERF ACE RD1/ DSR1/ RI1/ RTS1/ E6 U8-15 U8-13 U8-11 U10-11 SHEET 2 E5 RS-232 RS-422 U9-5 U9-3 GND SHEET 2 CTS1/ DCD1/ TD1/ DTR1/ SHEET 1 RD1 CTS1 DSR1 DCD1 E7 RS-422 U9-11 U9-13 GND SHEET 2 SHEET 1 RD2 CTS2 DSR2 DCD2 RD2/ DSR2/ RI2/ RTS2/ R9 +12V U8 MC145406 VEE+ VDO VEE- VSS +5V -12V GND E8 RS-232 U11-15 U[...]

  • Page 22

    1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746 © Copyright 2000. Black Box Corporation. All rights reserved.[...]