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Async 232↔422/485 Converter
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CUSTOMER
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INFORMATION
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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
FEBRUARY 1998
IC476A-F-R2
IC477A-M-R2
IC476A-M-R2
IC478A-F-R2
IC477A-F-R2
IC478A-M-R2
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Related Manuals for Black Box IC476A-F-R2
Summary of Contents for Black Box IC476A-F-R2
- Page 1 Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX SUPPORT 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 INFORMATION Web site: www.blackbox.com • E-mail: info@blackbox.com...
- Page 2 ASYNC 232↔422/485 CONVERTER FEDERAL COMMUNICATIONS COMMISSION 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.
- Page 3 ASYNC 232↔422/485 CONVERTER NORMAS OFICIALES MEXICANAS (NOM) 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.
- Page 4 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.
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Page 5: Table Of Contents
ASYNC 232↔422/485 CONVERTER 1. Specifications ...5 2. Introduction ...7 3. Configuration ...8 3.1 Setting the DTE/DCE Switch...9 3.2 DIP-Switch Configuration ...10 3.2.1 DIP-Switch Settings ...11 3.2.2 Configuration Switch Applications...13 3.2.3 When You’re Finished Configuring...13 4. Installation...14 4.1 Connection to the RS-485 Interface...14 4.1.1 4-Wire Connection Using the DB25 (IC477A or 78A-X-R2) ..14 4.1.2 4-Wire Connection Using Terminal Blocks (IC476A-X-R2) ...15 4.1.3 2-Wire Connection...18... -
Page 6: Specifications
Surge Protection RTS/CTS Delay MTBF Operating Temperature 1. Specifications Up to 115,200 bps IC476A-F-R2: (1) Female DB25, (1) Terminal block; IC476A-M-R2: (1) Male DB25, (1) Terminal block; IC477A-F-R2: (2) Female DB25s; IC477A-M-R2: (1) Female DB25, (1) Male DB25; IC478A-F-R2: (1) Male DB25, (1) Female DB25;... - Page 7 ASYNC 232↔422/485 CONVERTER Humidity Altitude Power Size Shipping Weight 5 to 95%, noncondensing Up to 10,000 feet (3048 m) Draws operating power from RS-232 data and control signals; no AC power or batteries required 2.7"H x 2.1"W x 0.7"D (6.9 x 5.3 x 1.8 cm) <1 lb.
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Page 8: Introduction
CHAPTER 2: Introduction 2. Introduction The Async 232 422/485 Converter provides exceptional versatility in a ↔ compact package. Requiring no AC power or batteries for operation, the Converter supports asynchronous data rates up to 115.2 Kbps over one or two unconditioned unshielded, solid-copper-core twisted pair. The Converter passes one control signal in each direction (see explanation ) and can handle up to 31 terminal drops in a multipoint Section 4.4... -
Page 9: Configuration
ASYNC 232↔422/485 CONVERTER 3. Configuration The Async 232 422/485 Converter is configured using an eight-position ↔ DIP switch and a DTE/DCE switch. The figure below shows the DTE/DCE switch location, along with the location of the terminal block. DTE/DCE Switch Terminal Block +RCV-G-XMT+ The illustration at the top of the next page shows the location of the eight-... -
Page 10: Setting The Dte/Dce Switch
CHAPTER 3: Configuration DIP Switch S1 1 2 3 4 5 6 7 8 3.1 Setting the DTE/DCE Switch For your convenience, the IC476A-X-R2 Converter has an externally accessible DTE/DCE switch (see the diagram on the previous page). To access the DTE/DCE switch on the IC477A-X-R2 and IC478A-X-R2, remove the plastic shells as illustrated on the next page. -
Page 11: Dip-Switch Configuration
ASYNC 232↔422/485 CONVERTER 3.2 DIP-Switch Configuration The eight positions on switch set S1 (shown in the first illustration below) configure the Converter for RTS/CTS delay (used in 2-wire, half-duplex mode only), echo mode (used in 2-wire, half-duplex mode only), method of carrier control, “transmit off”... -
Page 12: Dip-Switch Settings
3.2.1 DIP-S WITCH ETTINGS The factory-default settings for the switches are presented below. Read the information following the table for an explanation of the switch’s function. Position S1-1* “Transmit Off” Impedance S1-2* “Transmit Off” Impedance S1-3 RTS/CTS Delay S1-4 Echo Mode S1-5 Carrier Control S1-6... - Page 13 ASYNC 232↔422/485 CONVERTER S1-4: Echo Mode The setting for switch S1-4 determines whether the Converter echoes data back to the transmitting device (half-duplex mode only). S1-4 Setting Echo On Echo Off S1-5: Carrier-Control Method The setting for switch S1-5 determines whether the carrier is “Constantly On”...
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Page 14: Configuration Switch Applications
3.2.2 C ONFIGURATION The table below shows you how to set the Converter’s switch to fit several common applications. If you have any questions about the proper settings for your this manual. application, call your supplier for technical support. Switch Settings “Xmt Off”... -
Page 15: Installation
ASYNC 232↔422/485 CONVERTER Once you have properly set the configuration switches, you are ready to connect the Converter to your system. This chapter tells you how to properly connect the Converter to the RS-485 and RS-232 interfaces. 4.1 Connection to the RS-485 Interface To function properly, the unit wire. -
Page 16: 4-Wire Connection Using Terminal Blocks (Ic476A-X-R2)
2) It is not necessary that the RS-485 device adhere to the RS-530 standard. However, you must make sure that the signals, polarities, and pairing of your connection conform to this table. 3) If you are not using two IC477A-X-R2s or IC478A-X-R2s back to back and the procedure on the previous page produces garbage data (or none at all), flip the “A”... - Page 17 ASYNC 232↔422/485 CONVERTER Connect the other pair of wires again making careful note of which color is positive, and which color is negative. Positive and negative are relative terms and may not always have the same relationship for all RS-422 or RS-485 devices (see the previous note regarding “flipping the leads”).
- Page 18 Place the two halves of the strain-relief assembly on either side of the twisted-pair wire and press together very lightly. Slide the assembly so that it is about two inches (5.1 cm) from the terminal posts and press together firmly. Insert the strain-relief assembly with the wire going through it into the slot in the bottom half of the modem case and set it into the recess in the case.
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Page 19: 2-Wire Connection
ASYNC 232↔422/485 CONVERTER Bend the top half of the case as necessary to place it over the strain- relief assembly. Do not snap the case together yet. Insert one captive screw through a saddle washer, then insert the captive screw with the washer on it through the hole in the DB25 end of the case. -
Page 20: Connection To The Rs-232 Interface
4.2 Connection to the RS-232 Interface Once you have properly configured the Converter and connected the twisted-pair wires correctly, simply plug the Converter directly into the DB25 port of the RS-232 device. After doing so, remember to insert and tighten the two captive connector screws. If you must use a cable to connect the Converter to the RS-232 device, make sure it is a straight-through cable of the shortest possible length. -
Page 21: Operation
ASYNC 232↔422/485 CONVERTER 4.4 Operation Once the Converter is properly installed, it should operate transparently— as if it were a standard cable connection. Operating power is derived from the RS-232 data and control signals; there is no ON/OFF switch. All data signals from the RS-232 and RS-485 interfaces are passed straight through. -
Page 22: Appendix A. Rs-232C Pin Configurations
Appendix A. RS-232C Pin Configurations DIRECTION To Converter Data Term. Ready (DTR) - 20 DIRECTION From Converter Data Term. Ready (DTR) - 20 APPENDIX A: RS-232C Pin Configurations STANDARD “DCE” SETTING 1- (FG) Frame Ground 2- (TD) Transmit Data 3- RD) Receive Data 4- (RTS) Request to Send 5- (CTS) Clear to Send 6- (DSR) Data Set Ready... -
Page 23: Appendix B. 422/485 (530) Pin Configuration
ASYNC 232↔422/485 CONVERTER Appendix B. 422/485 (530) The pinout below applies to models IC477A-F-R2, IC477A-M-R2, IC478A-F-R2, IC478A-M-R2. Pin Number *Has internal function as well as being looped to the associated pin in the diagram. Pin Configuration TXA (positive) RXA (positive) TXB (negative) RXB (negative) RTS A (positive)*... -
Page 24: Appendix C. Self-Test
Appendix C. Self-Test 1) To perform a self-test/functionality test of the units, set the 8-position DIP switch for 4W point-to-point operation (see the chart in Section 3.2.2 2) Using two short pieces of twisted-pair cable, connect one wire between XMT+ and RCV+. Connect the other wire between XMT- and RCV-. 3) Send data from the RS-232 device. - Page 25 © Copyright 1998. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...