Related Manuals for Black Box SW544A-M
Summary of Contents for Black Box SW544A-M
- Page 1 © Copyright 2003. Black Box Corporation. All rights reserved. 1000 Park Drive • Lawrence, PA 15055-1018 • 724-746-5500 • Fax 724-746-0746...
- Page 2 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 4 FCC AND IC RFI STATEMENTS 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 B of Part 15 of FCC rules, which are designed to provide reasonable protection against such interference when the equipment is...
- Page 5 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 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 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM TRADEMARKS USED IN THIS MANUAL AT is a registered trademark of International Business Machines Corporation. Crosstalk is a registered trademark of Digital Communications Associates, Inc. MNP is a registered trademark of Microcom Systems, Inc. ProComm is a registered trademark of DATASTORM TECHNOLOGIES, INC.
- Page 8 WARNINGS AND CAUTIONS WARNING You might be shocked! Do not attempt to repair or service this device yourself. Only authorized service personnel should service internal components. WARNING This device should be operated only with the type of power source indicated on the instrument nameplate. If you are not sure of the type of power service available, consult your local power company.
- Page 9 Disconnect Power Immediately disconnect the unit from the outlet and contact Black Box if: 1. The power cord becomes frayed or damaged. 2. Liquid is spilled into the device or if the device is exposed to rain or water.
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Page 10: Table Of Contents
CONTENTS Contents Chapter Page Specifications ..........9 Introduction . - Page 11 Calling Black Box ........
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Page 12: Specifications
CHAPTER 1: Specifications 1. Specifications Coding: Asynchronous, 7 or 8 bits ASCII Parity: Even, odd, or none Stop Bits: 1 or 2 Data Rate: 300 to 115.2 kbps (standard rates) Flow Control: X-ON/X-OFF, RTS/CTS, both, or none Timeout: “No activity” timeout disconnects port; 1, 5, 10, 15, or 30 seconds; 1, 5, 15, 30, or 90 minutes Memory: Stores parameters and captured data;... -
Page 13: Introduction
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 2. Introduction 2.1 Overview The 8-Port Serial Port Manager with Integral Modem allows reliable, high-speed connections between PCs, modems, and other devices using dissimilar baud rates, parity, and flow control. It supports communication at speeds up to 115.2 kbps, features full RTS/CTS hardware handshaking, and has a 33.6-kbps internal modem. -
Page 14: Modem Components
CHAPTER 2: Introduction 2.2 Modem Components The Serial Port Manager’s front panel has two user control buttons and ten LED indicators. See Figure 2-1 and Table 2-1. Numbers 1–10 in Figures 2-1 and 2-2 correspond to the numbers in Table 2-1. Figure 2-1. - Page 15 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM Table 2-1. Connectors, indicators, and user controls. Number Name Type Function CLEAR Button This button restarts the Serial Port Manager’s operating program without changing user-selected parameter settings or breaking port connections. This indicator lights when AC power is applied.
- Page 16 CHAPTER 2: Introduction Table 2-1 (continued). Connectors, indicators, and user controls. Number Name Type Function — Switch Turns power to the Serial Port Manager on or off. SETUP DIP switch This bank of eight DIP switches sets default communication parameters and other features.
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Page 17: Quick-Start Guide
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 3. Quick-Start Guide This chapter provides a brief overview of basic 8-Port Serial Port Manager with Integral Modem capabilities. It also describes the procedures for installing the unit and accessing the Command mode. NOTE This chapter demonstrates the Serial Port Manager’s basic functions and capabilities. - Page 18 CHAPTER 3: Quick-Start Guide 7. At the APS> prompt, type /H and press Enter to display the Help menu (Figure 3-1). This menu provides a basic listing of all Serial Port Manager commands. COMMAND MENU DISPLAY CONFIGURATION /S[P] Port Status System Parameters Port Diagnostics /P[n]...
- Page 19 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM PORT STATUS: Serial Port Manager, Version 2.00, Site ID: (undefined) PORT | NAME | PASSWORD | STATUS | MODE | BUFFER COUNT --------------+-------------------------+------------------------------------+-----------------+--------------------+-------------------- | (undefined) | (undefined) | Free | Any | (undefined) | (undefined) | Free | Any | (undefined) | (undefined) | Free | Any...
- Page 20 CHAPTER 3: Quick-Start Guide iii. Issue a third-party disconnect command to disconnect ports 2 and 3. The Serial Port Manager displays the “Are you Sure (y/n)?” prompt. Type y and press Enter to disconnect. iv. Type /S and press Enter to display the Port Status screen. The STATUS column now lists ports 2 and 3 as free.
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Page 21: Hardware Installation
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 4. Hardware Installation 4.1. Connecting AC Power to the Serial Port Manager CAUTION Operate this device only with the type of power source indicated on the instrument nameplate. If you are not aware of the type of power service available, please contact your local power company. -
Page 22: Default Baud Rate (Sw1, Sw2, Sw3)
CHAPTER 4: Hardware Installation 4.2.1 D (SW1, SW2, SW3) EFAULT DIP-switch positions 1 through 3 select the default baud rate for RS-232 ports 1 through 7. The default baud rate must match the rate your control device will use when communicating with the Serial Port Manager. NOTES If the control device communicates via an external modem connected to one of the RS-232 ports, select a default baud rate that’s compatible... -
Page 23: Default Handshake (Sw4, Sw5)
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 4.2.2 D (SW4, SW5) EFAULT ANDSHAKE DIP-switch positions 4 and 5 select the default handshake format for RS-232 ports 1 through 7. The default handshake format must match the format your control device uses when communicating with the Serial Port Manager. Switches 4 and 5 select RTS/CTS (hardware), X-ON/X-OFF, both, or none. -
Page 24: Default Response Message Format (Sw6)
CHAPTER 4: Hardware Installation 4.2.3 D (SW6) EFAULT ESPONSE ESSAGE ORMAT When commands are invoked, the Serial Port Manager responds with either verbose or terse (abbreviated) messages. Response messages are summarized in Section 11.2. After installation, the /P command also sets the response format to “none”... -
Page 25: Connecting Devices To The Serial Port Manager
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 2. Release the CLEAR button. Wait for the Port LEDs to flash, then release the SET button. 4.4 Connecting Devices to the Serial Port Manager Serial Port Manager RS-232 ports 1 through 7 are standard DB9 connectors, configured as DTE ports, and are similar to a standard serial port on a PC. -
Page 26: Configuration
CHAPTER 5: Configuration 5. Configuration 5.1 Accessing the Serial Port Manager Command Mode When the Serial Port Manager’s Command mode is active, you can invoke commands to select parameters and connect or disconnect ports. NOTE Command mode can’t be accessed from a Buffer mode port, Passive mode port, or any port that’s currently connected to another Serial Port Manager port. -
Page 27: System Setup Ports
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 5.2 System Setup Ports Ports 1 and 2 are designated as system setup ports. These ports always permit password-protected access to supervisor-level command functions, even when the unit is reinitialized to default parameters. To ensure that access to command functions is always available, ports 1 and 2 can’t be configured as Buffer mode or Passive mode ports (Buffer and Passive mode ports are not able to access the Command mode.) In addition, ports 1 and 2 always... -
Page 28: The Port Passwords
CHAPTER 5: Configuration NOTES If the supervisor password is not defined, then supervisor-level commands are available to all ports, and port access and configuration functions are not password protected. If you want to restrict user ports from changing Serial Port Manager configuration parameters or connecting to restricted ports, define the supervisor password. -
Page 29: Defining The Site Id And Supervisor Password
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM For example, if the port password “test” is assigned to ports 3, 4, and 5, then when “test” is entered at the password prompt, you can connect only to ports 3, 4, and 5 and can view parameters for ports 3, 4, and 5 only. -
Page 30: Port Configuration
CHAPTER 5: Configuration 3. Supervisor password: (Up to 16 characters; Default = undefined.) Type 2 and press Enter. A prompt appears. Type in the desired password, then press Enter. The Serial Port Manager prompts you to re-key the password to confirm spelling and capitalization. -
Page 31: Port Modes
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 5.5.2 P ODES The Serial Port Manager offers four different port operation modes: Any-to-Any mode, Passive mode, Buffer mode, and Modem mode. • Any-to-Any mode: Allows communication between connected ports. Any-to- Any mode ports can be connected to other Any-to-Any mode, Passive mode, Buffer mode, or Modem mode ports by accessing Command mode and invoking the /C command (see Section 8.1.1). - Page 32 CHAPTER 5: Configuration 2. Type /P, followed by the number of the port to be configured, and press Enter. For example, to configure port 2, type /P 2 and press Enter. The Port Configuration menu appears (see Figure 5-1). PORT PARAMETERS #02 Port Name: (undefined) Password:...
- Page 33 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM NOTES The port password is not displayed by the Port Parameters menu. When the port password is defined, the field for this item will read “defined.” To display port passwords, invoke the /SP or /WP commands as described in Chapter 7.
- Page 34 CHAPTER 5: Configuration 72. Initialization String: Defines a command string sent to initialize a modem to settings required by your application. (Up to 48 characters; defaults: port 1 through 7 = AT& C1$ D2S0=1; port 8 = ATM0& C1$ D2S0=1.) 73.
- Page 35 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM NOTE When a resident connection is initiated, the Serial Port Manager sends a message that lists the connected ports and displays the one- or three- character command required to disconnect. The one-character disconnect sequence is intended for situations where the destination port does not receive the disconnect command.
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Page 36: Copying Parameters To All Ports
CHAPTER 5: Configuration 5.6 Copying Parameters to All Ports The /CP command (Copy Port Parameters) selects similar parameters for all Serial Port Manager RS-232 ports. When the /CP command is invoked, the Serial Port Manager displays a menu that allows you to select port communication parameters, then copy them to all Serial Port Manager RS-232 ports. - Page 37 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM COPY PORT PARAMETERS 1. Port Name: (undefined) 2. Password: 3. Baud Rate: 4. Bits/Parity: 5. Stop Bits: 6. Handshake Mode: 7. Port Mode: 74. DTR Output: 8. Supervisor Mode: 9. Logoff Character: 10. Sequence Disconnect: 11.
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Page 38: Saving User-Selected Parameters
CHAPTER 5: Configuration NOTE You don’t have to define all port parameters. For example, use the /CP command to select only the baud rate for all ports. NOTE The /CP command copies the parameters currently displayed by the Copy Port Parameters menu. Although the port password is not displayed, the selected password is copied if the field for this item reads defined. -
Page 39: The Internal Modem
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 6. The Internal Modem NOTE Although port 8 is the internal modem port, any Serial Port Manager port can also be configured for connection to an external modem. 6.1 Communicating with the Internal Modem To communicate with the Serial Port Manager’s internal modem, proceed as follows: 1. -
Page 40: Common At Commands
CHAPTER 6: The Internal Modem 6.2 Common AT Commands This section lists some of the most commonly used AT commands for the Serial Port Manager’s internal modem. For a complete listing of all available AT Commands and S-Registers, access the modem Command mode and display the modem Help screen using the $H n command. - Page 41 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM Command Function/Options &D n Data Terminal Ready (DTR) signal. &D0 Ignore DTR. &D1 Modem returns to Command mode. * &D2 Normal DTR. &D3 DTR drop causes modem to reset to default parameters. Set modem command mode echo. Disable echoing of Command mode characters.
- Page 42 CHAPTER 6: The Internal Modem Command Function/Options &E n Error correction/flow control. &E0 No error correction. * &E1 V.42 auto-reliable mode. &E2 V.42 reliable mode. &E3 No modem-initiated flow control. * &E4 CTS/RTS modem-initiated flow control. &E5 X-ON/X-OFF modem-initiated flow control. * &E6 Disable X-ON/X-OFF pass-through.
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Page 43: The Status Screens
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 7. The Status Screens The Serial Port Manager Status screens display the connection status and communication parameters for its RS-232 ports. There are three different types of status screens: the Port Status screen (/S), the Port Diagnostics screen (/SD), and the Port Parameters screen (/W). - Page 44 CHAPTER 7: The Status Screens PORT STATUS: Serial Port Manager Version 2.00 Site ID: (undefined) PORT | NAME | PASSWORD | STATUS | MODE | BUFFER COUNT ------------------------------------------------------------------------------------------------------------------------------------------------ | (undefined) | (undefined) | Free | Any | (undefined) | (undefined) | Free | Any | (undefined) | (undefined) | Free | Any | (undefined)
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Page 45: The Port Diagnostics Screen (/Sd)
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 7.2 The Port Diagnostics Screen (/SD) The Port Diagnostics screen provides more detailed information about each port. To display the Port Diagnostics screen, access the Command mode, type /SD, and press Enter. The screen appears as shown in Figure 7-2. PORT DIAGNOSTICS: Serial Port Manager Version 2.00 Site ID: (undefined) PORT | NAME... -
Page 46: The Port Parameters Screen (/W)
CHAPTER 7: The Status Screens • Status: The connect status for each port. When the port is connected, this column lists the number of the other port that is connected to this port. If this column contains an asterisk, the port has accessed the Command mode. •... - Page 47 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM PORT PARAMETERS #03 Port Name: (undefined) Password: (undefined) Baud Rate: 9600 Bits/Parity: 8–None Stop Bits: Handshake Mode: RTS/CTS Port Mode: Any-to-Any 74. DTR Output: Pulse Supervisor Mode: Permit Logoff Character: Sequence Disconnect: One Character Timeout Disconnect: Response Type: Verbose...
- Page 48 CHAPTER 7: The Status Screens The /W command uses the following format: /W[P] xx [Enter] where xx is the desired port number, and P is the command option to display port passwords. NOTE When this option is included (for example, /WP 5 ), the Port Parameters screen will display the port password, if defined (Supervisor mode only).
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Page 49: Operation
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 8. Operation 8.1 Any-to-Any Mode Any-to-Any mode ports can be connected to other Any-to-Any, Passive, Buffer, or Modem mode ports by accessing the Command mode and issuing the /C command. All ports can be configured for Any-to-Any mode. 8.1.1 P ONNECTION AND ISCONNECTION... - Page 50 CHAPTER 8: Operation a) Resident connect: To connect your resident port to another port, type /C xx and press Enter (xx is the number or name of the port you want to connect). The Serial Port Manager displays the numbers of the connected ports, along with the command sequence required to disconnect the two ports.
- Page 51 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM a) One character (default): When the one-character disconnect sequence is selected, simply enter the selected logoff character once. (Default = ^X ([Ctrl] plus [X]).) NOTE You don’t have to enter a carriage return before or after the logoff character.
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Page 52: Defining Hunt Groups
CHAPTER 8: Operation 3. No activity timeout: If the timeout feature is enabled at either connected port, the no activity timeout disconnects resident ports or third-party ports. a) RS-232 Ports: To configure the timeout feature for the RS-232 ports, invoke the /P command to display the Port Configuration menu for the desired port as described in Section 5.5.3. -
Page 53: Passive Mode
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 7. You need to enter only enough letters of the port name to differentiate the hunt group ports from other ports. Type an asterisk (*) to represent the remaining characters in the port name. For example, to connect your resident port to the first available port in a group of ports named SALES1, SALES2, and SALES3, invoke the connect command by typing /C S* and pressing Enter (providing no other port names begin with the letter S). -
Page 54: Buffer Mode
CHAPTER 8: Operation NOTES A Passive mode port can’t access the Command mode. To ensure supervisor access to important command functions, the Passive mode is not available to ports 1 and 2 (setup ports). Port 8 (internal modem port) can’t be configured as a Passive mode port. -
Page 55: Port Buffers
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM If the port’s buffer is empty, the Serial Port Manager sends a message that reads Connected xx, Buffer Empty where xx is the port number. If the buffer contains data, the Serial Port Manager displays a prompt that offers four options: •... -
Page 56: Modem Mode
CHAPTER 8: Operation If the status screen indicates an accumulation of data, use the /E (Erase Buffer) command to clear the buffer. 8.4 Modem Mode In addition to allowing data transfer, the Modem mode also provides additional functions specifically related to modem communication. A Modem mode port performs all functions normally available in Any-to-Any mode. -
Page 57: Saving And Restoring Configuration Parameters
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 9. Saving and Restoring Configuration Parameters After the Serial Port Manager is properly configured, parameters can be downloaded and saved as an ASCII text file. Later, if the configuration is accidentally altered, the file with the saved parameters can be uploaded to automatically reconfigure the Serial Port Manager without manually assigning each parameter. -
Page 58: Restoring Saved Parameters
CHAPTER 9: Saving and Restoring Configuration Parameters 9.2 Restoring Saved Parameters This section describes the procedure for using your communications program to send stored parameters to the Serial Port Manager. 1. Start your communications program and access the Serial Port Manager Command mode. -
Page 59: Upgrading Serial Port Manager Firmware
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 10. Upgrading Serial Port Manager Firmware When new, improved versions of the Serial Port Manager operating firmware become available, use the /UF (Upgrade Firmware) function to update the Serial Port Manager to the new firmware version. Upload updates to the Serial Port Manager via setup ports 1 and 2, or via the internal modem port (port 8). - Page 60 7. Emergency recovery: In the rare event that the Serial Port Manager operating system becomes corrupted during installation, front-panel indicators blink five times and the unit automatically switches to emergency recovery mode. Please contact Black Box Technical Support at 724-746-5500 for further instructions.
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Page 61: Command Reference Guide
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 11. Command Reference Guide 11.1 Command Conventions The commands described in this section conform to the following conventions: • Slash character: Most Serial Port Manager commands begin with the slash character (/). • Apply command to all ports: When the asterisk character is entered as the argument of the /D command (disconnect port) or the /E command (erase buffer), the command applies to all ports. -
Page 62: Command Response
CHAPTER 11: Command Reference Guide 11.2 Command Response When commands are sent to the Serial Port Manager, it responds with either verbose (English Text) or terse messages (numeric/abbreviated). The default message type for all ports is set to either terse or verbose using DIP-switch- position 6. -
Page 63: Command Summary
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM 11.3 Command Summary Command Availability Function Command Syntax Supervisor User Enter Command Mode [Enter] Exit Command Mode /X [Enter] Help Menu /H [Enter] Display Site ID /J [Enter] Display Port Status /S[P] [Enter] Display Port Diagnostics /SD [Enter] Display Port Parameters... -
Page 64: Command Set
CHAPTER 11: Command Reference Guide NOTE The resident disconnect sequence can be redefined via the Port Configuration menus. 6. Third-party disconnect: Disconnects two or more nonresident ports. Must be issued from a third port with supervisor-command capability. 11.4 Command Set This section provides more detailed information on all Serial Port Manager commands. - Page 65 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM Response: Verbose: The Serial Port Manager sends the Disconnected message, followed by the Port Status screen. Terse: 3 ONNECT Establishes a bi-directional connection between two ports. For more information and command line examples, refer to Section 8.1. There are two different types of port connections: •...
- Page 66 CHAPTER 11: Command Reference Guide RS-232 P ARAMETERS Allows quick setup when all Serial Port Manager RS-232 ports are configured with the same or similar parameters. When the /CP command is invoked, the Serial Port Manager displays a menu used to select common port parameters, which can then be copied to all Serial Port Manager RS-232 ports.
- Page 67 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM Example: To disconnect port 2 from port 3 without the “Sure?” prompt, access the Command mode from a third port with “All” command capability. Type one of the following commands: /D/Y 2 [Enter] or /D/Y 3 [Enter] RASE UFFER Erases data from the buffer for a specified port or several ports.
- Page 68 CHAPTER 11: Command Reference Guide NOTE Record your supervisor password for future reference. If the supervisor password is lost or forgotten, you can’t access supervisor-level commands. Availability: Supervisor only Format: /F [Enter] Response: Displays System Parameters menu. Displays a Help screen. This screen lists all Serial Port Manager commands and a brief description of each command.
- Page 69 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM Terse: 5. If “y,” memory test and initialization begins. (The terse commands are numeric responses to specific commands as opposed to verbal responses. The Serial Port Manager will respond with a different number depending on the command issued.) ISPLAY Displays the user-defined site ID message.
- Page 70 CHAPTER 11: Command Reference Guide When the P option is included (for example, /SP), the Port Status screen lists the password for each port, if defined (Supervisor mode only). Response: Displays Port Status screen. ISPLAY IAGNOSTICS Provides more detailed information regarding the operational status of each port. In User mode, this screen displays parameters only for the ports allowed by the port password entered at login.
- Page 71 8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM ISPLAY ARAMETERS Displays configuration of an individual port, but does not allow you to change parameters. Ports with user-level command capability can’t display parameters for other ports. Normally, the port parameters screen doesn’t include the port password.
- Page 72 CHAPTER 11: Command Reference Guide Availability: Supervisor/User Format: /X [Enter] Response: Disconnected.
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Page 73: Appendix A. Rs-232 Port Interface
8-PORT SERIAL PORT MANAGER WITH INTEGRAL MODEM Appendix A. RS-232 Port Interface DCD and DTR hardware lines function as follows: When connected: 1) If either port is set for Modem mode, the DTR output at either port reflects the DCD input at the other end. 2) If neither port is set for Modem mode, DTR output is held high (active). -
Page 74: Appendix B. Troubleshooting
If you determine that your 8-Port Serial Port Manager with Integral Modem 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...