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MARCH 2000
SW980A SW980AE
SW981A SW981AE
SW982A SW982AE
Local/Remote Electronic Switches
CUSTOMER
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
INFORMATION
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
2 TO 1
LOCAL / REMOTE
SWITCH
B
REMOTE
A
A B
PWR
®
R
BLACK BO
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FCC/IC/CE STATEMENTS FEDERAL COMMUNICATIONS COMMISSION AND 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 rule
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LOCAL/REMOTE ELECTRONIC SWITCHES 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. 3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de operación deben ser respetadas. 4. Todas las instrucciones de operación y uso deben ser segui
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NOM STATEMENT, TRADEMARKS 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. 14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las recomendaciones del fabricante. 15. En caso de existir, un
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LOCAL/REMOTE ELECTRONIC SWITCHES Contents Chapter Page 1. Specifications ............................................................................................. 5 2. Introduction ............................................................................................... 7 3. Installation and Configuration ................................................................. 8 3.1 Before You Install ................................................................................ 8 3.2 T
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CHAPTER 1: Specifications 1. Specifications Compliance — FCC Part 15 Subpart J Class A, IC Class/classe A Data Rate — Up to 256 kbps typical; higher speeds possible with careful consideration of cabling and equipment requirements User Controls — All models: Remote switching either through TTL, RS-232, RS-422/485, or other active drivers or through dry-contact closure; SW980 and SW982 models: (1) Rear-mounted 2-position DIP switch for grounding; SW981 models: (2) Rear-mounted 2-position DIP switc
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LOCAL/REMOTE ELECTRONIC SWITCHES Remote Input Logic Levels — V greater than 2.5 volts, maximum +15 volts; IH V less than 0.5 volts, minimum –15 volts IL NOTE For dry-contact operation, the total external- connection DC resistance must be less than 240 ohms when the dry contact is closed for the Local/Remote Electronic Switch to correctly read this condition as a “low” input. Power — SW980A, SW981A, SW982A: From wallmount power supply PS154: Input: 120 VAC, 60 Hz; Output: 17 VAC CT; SW980AE, SW98
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CHAPTER 2: Introduction 2. Introduction Switching between data lines manually can often damage the connected equipment, because this relatively slow and imprecise action can cause data-line surges and spikes large enough to damage today’s sensitive circuitry. With the Local/Remote Electronic Switches, you can eliminate this potential hazard. Their electronic switching action provides surgeless, spikeless changeovers—something a mechanical switch just can’t do. In addition, these switches can be
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LOCAL/REMOTE ELECTRONIC SWITCHES 3. Installation and Configuration 3.1 Before You Install Check the box and its contents before you begin installing your Local/Remote Electronic Switch. You should have received one Switch unit, one AC power supply, and one copy of this manual. If you didn’t receive all of these items, or if they have sustained damage that does not seem to be shipping-related, notify Black Box right away. If they have sustained impact or water damage that seems to have happened d
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CHAPTER 3: Installation and Configuration 3.2 The Setup Procedure Installing and configuring a Local/Remote Electronic Switch is relatively quick and easy, and will vary only slightly depending on which model you’ve chosen. Follow these steps: (Steps 1 through 4 are for remotely switched applications only:) 1. Make sure that the Switch is unplugged (is not receiving AC power). Open the Switch by unscrewing the two screws on the bottom of the unit (save these screws) and removing the top of the u
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LOCAL/REMOTE ELECTRONIC SWITCHES W1 A B C TB1 REAR FRONT Figure 3-1. PCB layout of the SW980 models. 10
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CHAPTER 3: Installation and Configuration TB1 A B C W1 REAR FRONT Figure 3-2. PCB layout of the SW981 models. 11
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LOCAL/REMOTE ELECTRONIC SWITCHES W2 TB1 A W3 B A C B C FRONT REAR Figure 3-3. PCB layout of the SW982 models. 12
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CHAPTER 3: Installation and Configuration (text continued from page 9) 3. If you will be performing remote switching using a cable that is unterminated at the Switch end, attach the cable’s wires to the appropriate positions of the 4-position terminal block labeled “TB1” (refer to Figures 3-1 through 3-3 on pages 10 through 12 and to Tables 4-1 and 4-2 on pages 20 and 21). Connect the ground of the remote driver, or one side of the dry contact, to (either of) the terminal block’s ground pin(s).
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LOCAL/REMOTE ELECTRONIC SWITCHES B A BB AA SERIAL PARALLEL REMOTE Figure 3-5. Rear panel of the SW981 models. B A SERIAL PARALLEL REMOTE C E D Figure 3-6. Rear panel of the SW982 models. 14
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CHAPTER 3: Installation and Configuration 6. Set the DIP switch(es) as appropriate for your application. Refer to Table 3-1 and Figure 3-7 below, and keep in mind that OFF = UP and ON = DOWN. Table 3-1. Possible Settings for Switches S2 and S3 All 25 leads of the Local/Remote Electronic Switch’s DB25 connectors are straight- through and are isolated from one another. In RS-232 and DB25 parallel applications, we recommend that you use DIP switches S2 and S3 to make a “common” ground connection;
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LOCAL/REMOTE ELECTRONIC SWITCHES 7. Put the Switch in the site you’ve selected. 8. Shut off the equipment you plan to connect to the Switch. 9A. SW980 and SW982 units only: Connect the cable from the “common” device (the one that’s going to access—or be shared by—the other devices) to the common connector (marked “C”) on the Switch’s rear panel. Connect the cables from the “branch” devices (those that will share—or be intermittently accessed by—the other device) to the branch connectors (marked
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CHAPTER 4: Operation 4. Operation 4.1 Local Switching 4.1.1 ABC AND ABCDE SWITCHES (SW980 AND SW982 UNITS) Refer to Figure 4-1 below: Test your Local/Remote Electronic Switch system by having the common device send data to, or receive data from, branch devices “A” and “B” (and, for SW982 units, “D” and “E”), one after the other. Switch between branch devices by manually turning the knob on the Switch’s front panel. ABC SWITCH SWITCHED A COMMON C SWITCHED B Connections made are AC and BC -“C” IS
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LOCAL/REMOTE ELECTRONIC SWITCHES 4.1.2 X SWITCHES (SW981 UNITS) Refer to Figure 4-2 below: Test your Local/Remote Electronic Switch system by having each source device (“A” and “B”) send data to each destination device (“AA” and “BB”), one after the other. Switch between data pathways by manually turning the knob on the Switch’s front panel. “X” SWITCH A AA B BB Connections made are A-AA & B-BB or A-BB & B-AA Figure 4-2. Switching in the SW981 models. 18
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CHAPTER 4: Operation 4.2 Remote Switching When you do remote switching, keep these things in mind: • The knob on the Switch’s front panel must be in the “REMOTE” position. • The Switch interprets any voltage more negative than approximately 1.4 volts as a “low” and any voltage more positive than approximately 1.4 volts as a “high” (see the “Remote Input Logic Levels” spec in Chapter 1 for maximum and minimum switching points). • In dry-contact applications, the Switch will read a “low” when the
