Black Box 202T User Manual
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Black Box 202T User Manual

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MAY 2001
MD845A-R2
Modem 202T
CUSTOMER
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
SUPPORT
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
INFORMATION
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com

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  • Page 1 Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500) SUPPORT FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746 INFORMATION Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018 Web site: www.blackbox.com • E-mail: info@blackbox.com...
  • Page 2 FCC AND IC RFI INFORMATION FEDERAL COMMUNICATIONS COMMISSION INDUSTRY CANADA 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. 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 against such interference when the equipment is...
  • Page 3 MODEM 202T FCC REQUIREMENTS FOR TELEPHONE-LINE EQUIPMENT 1. The Federal Communications Commission (FCC) has established rules which permit this device to be directly connected to the telephone network with standardized jacks. This equipment is designed to operate only on dedicated phone lines or wires.
  • Page 4 Repairs to certified equipment should be made by an authorized maintenance facility—in this case, Black Box. Any repairs or alterations made by the user to this equipment, or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment.
  • Page 5 MODEM 202T 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.
  • Page 6 NOM STATEMENT 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 tal manera que no sean pisados ni pellizcados por objetos colocados sobre o contra ellos, poniendo particular atención a los contactos y receptáculos donde salen del aparato.
  • Page 7 MODEM 202T TRADEMARKS USED IN THIS MANUAL Any trademarks mentioned in this manual are acknowledged to be the property of the trademark owners.

  • Page 8: Table Of Contents

    A.1 Calling Black Box........

  • Page 9: Specifications

    MODEM 202T 1. Specifications Range: Up to 20 miles on unloaded lines, depending upon line characteristics. Unlimited on loaded lines. Operating Frequency: 1200/2200 Hz (Bell 202 or 1300/2100 CCITT V.35) FSK (Frequency Shift Key) Data Rates: 300, 600, or 1200 baud half- or full duplex up to 1200 baud simplex Handshake Modes: DataSense (DSCC) or RTS line Enclosure: Standard NEMA 1;...

  • Page 10: Introduction

    DataSense (DSCC) microprocessor firmware. This feature detects and buffers incoming RS-232 data to allow the assertion and stabilization of the FSK carrier before transmitting the buffered characters. The nominal operating supply voltage for the Modem 202T is 12 VDC via a 2-conductor screw terminal power connector.

  • Page 11: Modem Configurations

    60 milliseconds RTS to data, and zero milliseconds RTS off delay at the end of the data. If you are adding the Modem 202T to an existing system with previous models of Modem 202Ts, a minimum of 100 milliseconds RTS to data delay is...

  • Page 12: Half-Duplex 4-Wire Mode

    Carrier Detect (Amber) and Data Out (Green) LEDs will flash as data is received. 3.3 Half-Duplex 4-Wire Mode The Modem 202T will operate in half-duplex 4-wire mode with one master and one or more remote modems. The master’s carrier transmitter “4-wire” line must be connected to the remote’s receiver line “2-wire”...

  • Page 13: Simplex Or Bits Mode

    (Amber) and Data Out (Green) LEDs will flash. 3.4 Simplex or Bits Mode In Bits mode, the Modem 202T sends data from a master to a remote(s) in one direction only. In this mode, the modem is protocol- or format transparent and will only operate in 2-wire mode.

  • Page 14: Making Connections

    CHAPTER 4: Making Connections 4. Making Connections The Modem 202T has four connection points. (See Figure 4-1.) On the left is the DC power connection. The standard modem has a two-position terminal block connector for use with the supplied wallmount power supply. The DB9 connector is the RS-232 interface.

  • Page 15: Power Connector

    MODEM 202T 4.2 Power Connector The two-position screw terminal connector is left pin negative (-) and right pin positive (+). DC negative is not connected to the chassis. 4.3 RS-232 Serial Connector Table 4-1. RS-232 serial connector. Pin Number Name...

  • Page 16: Operating Mode Selection And Wiring

    CHAPTER 4: Making Connections 4.4 Operating Mode Selection and Wiring Table 4-2. Operating mode selection and wiring. Wire Mode Use Connectors SW2-5 SW2-6 Notes 2 wire Half- 2 wire to 2 wire 2 wire One master with 1 or Duplex parallel all units.

  • Page 17: Operation

    Compatible 2-wire 4-wire Power RS-232 Carrier Lines LEDs Figure 5-1. Component locator. If the Modem 202T will be used with existing Modem 202Ts, you must set SW1 for Modem 202T mode (SW1 set away from SW3) to maintain frequency compatibility.

  • Page 18: Baud Rate Selection

    Switches are only read during power on. 5.2 Baud Rate Selection The Modem 202T will operate at 300, 600, and 1200 baud in a 10- or 11-bit word format. The modem is parity transparent; however, it must know if there are 8 or 9 bits of data/parity.

  • Page 19: Character Format

    11 bits. This switch is ignored in simplex mode. 5.4 Handshake Lines If RTS handshaking mode is set, the Modem 202T needs the RTS asserted when it is time to transmit data onto the FSK carrier from the equipment. Depending upon how the modem is configured, it can provide DCD, CTS, and DSR signaling back to your equipment.
  • Page 20 CHAPTER 5: Operation 3. Temporarily short together the JP1 header pins 1 and 3 and re-apply DC power. 4. A repeating sequence will occur. First, the Green LED (O) will flash, followed by seven (7) flashes of the Amber LED (“C”). 5.

  • Page 21: Appendix. Troubleshooting

    MODEM 202T Appendix. Troubleshooting A.1 Calling Black Box If you determine that your Modem 202T is malfunctioning, do not attempt to alter or repair the unit. It contains no user-serviceable parts. Contact Black Box at 724-746-5500. Before you do, make a record of the history of the problem. We will be able to...
  • Page 22 © Copyright 2001. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...

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