Western Telematic APS-8M manual

WTI Part No. 13511 Rev . B APS-8M / APS-16M Asynchronous Port Switches with Internal Modem Firmware V ersion 4.x Models Covered: APS-8M APS-8M-DC APS-16M APS-16M-DC User ’s Guide[...]

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i Warnings and Cautions: INST ALL ATION INSTRUCTIONS Secure Racking If Secure Racked units are installed in a closed or multi-unit rack assembly , they may require further evaluation by Certification Agencies. The following items must be considered. 1. The ambient within the rack may be greater than room ambient. Installation should be such that t[...]

ii APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide No Serviceable Parts Inside; Authorized Service Personnel Only Do not attempt to repair or service this device yourself. Internal components must be serviced by authorized personnel only . • Shock Hazard - Do Not Enter Disconnect Power If any of the following events are noted, immedi[...]

iii T able of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 2. Unit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 2.1. Front Panel . . . . . . . . . . . . . . . . . . . . [...]

iv APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 9. Saving and Restoring Configuration Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1 9.1. Sending Parameters to a File . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1 9.2. Restoring Saved Parameters . . . . . . . . . . . . [...]

1-1 1. Introduction WTI’ s APS-8M and APS-16M Asynchronous Port Switches allow reliable, high-speed connections between PCs, modems, and other devices using dissimilar baud rates, parity , and flow control. The APS-8M and APS-16M support communication at speeds up to 1 15.2 Kbps, and feature full R TS/CTS hardware handshaking and a 33.6K V .34 i[...]

1-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide Modem Communication The APS-8M and APS-16M can both be controlled by a local PC that communicates with the unit via cable, or controlled remotely via external modem. Hyperterminal (or another communications program) is used to send commands to connect ports or display status. Configur[...]

2-1 2. Unit Description 2.1. F ront Panel Figur e 2.1: Instrument Front Panel (Model APS-8M)  CLEAR: Restarts the APS-8/16M operating program without changing user-selected parameter settings or breaking port connections.  ON: Lights when AC Power is applied.  SET : Used to Initialize the APS-8/16M to factory defaults. T o initialize, pres[...]

2-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 2.2. Back Panel Figur e 2.3: Instrument Back Panel (Model APS-8M)  Power Cable Receptacle: AC powered units only . DC units include a terminal block assembly as described in Section 4.1.2.  Power Switch  Modem Port (Line Port): For connection to your phone line. For informati[...]

3-1 3. Getting Started This Quick Start Guide describes a simplified installation procedure for the APS-8M and APS-16M hardware, which will allow you to communicate with the unit in order to demonstrate basic features and check for proper operation. Note that this Quick Start Guide does not provide a detailed description of unit configuration, or[...]

3-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 3.3. Communicating with the APS-8/16M The APS-8/16M command mode allows you to check unit status, change configuration parameters and connect and disconnect ports (including the Modem Port.) 1. Access Command Mode: a) Via Local PC: Start your communications program and then press [En[...]

3-3 Getting Started 4. Creating Connections Between Ports: The APS-8/16M can perform two different types of port connections; Resident Connections and Third Party Connections. a) Resident Connection: Y our resident port (e.g. Port 1) issues a /C command to connect to a second port. i. T o connect Port 1 to Port 2, type /C 2 [Enter] . While Port 1 i[...]

3-4 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 5. Exit Command Mode: At the "APS>" command prompt, type /X and press [Enter] . The APS-8/16M will exit command mode. This completes the Quick Start Guide for the APS-8/16M. Prior to placing the unit into operation, please proceed to Sections 4 and 5 for complete installa[...]

4-1 4. Hardware Installation 4.1. Connecting Power to the APS Unit The APS-8/16M is available in both AC and DC powered versions. When connecting power , proceed as follows: CAUTION: • Before attempting to install this unit, please r eview the warnings and cautions listed at the front of the user's guide. • This device should only be opera[...]

4-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 4.2. Connect a T elco Line to the Modem Port Use a standard RJ-1 1 cable to connect your T elco outlet to the Modem (Line) Port, located on the APS-8/16M back panel. Note that the APS-8M sees the internal modem as Port 8, and the APS-16M sees the internal modem as Port 17. 4.3. Connec[...]

5-1 5. Configuration 5.1. Access to the APS-8/16M Command Mode When the APS-8/16M command mode is active, commands can be invoked to select parameters, and connect or disconnect ports. Note: • Command mode cannot be accessed from a Buffer Mode Port, Passive Mode Port, or any port that is currently connected to another APS-8/16M port. • Configu[...]

5-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 5.2. System SetUp Ports Ports 1 and 2 are designated as System SetUp Ports, and will therefore, always permit password protected access to Supervisor Mode. In order to ensure that access to command functions is always available, Ports 1 and 2 cannot be configured as Buffer Mode or Pa[...]

5-3 Confi guration Notes: • If you do not define at least one password that permits access to Supervisor Mode, then Supervisor Level commands will be available to all ports, and port access and configuration functions will not be password protected. • If you wish to restrict users from changing APS-8/16M configuration parameters or connecti[...]

5-4 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide T o define System Parameters, you must first access command mode, and then type /F [Enter] to display the System Parameters Menu (Figure 5.1.) The System Parameters Menu allows you to define the following: 1. Site ID: T ype 1 and press [Enter] , a prompt will appear . Key in the de[...]

5-5 Confi guration 5.4.1. The Password Directory APS-8/16M passwords are defined using the "Edit Password Directory" menu, which is accessed via the System Parameters menu (/F). In addition to assigning command level privileges to each password, the Edit Password Directory function also allows you to determine which ports each password [...]

5-6 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 5.4.1.1. Adding P asswords The "Add Name/Password" menu is used to create new user accounts and add passwords to the password directory . T o access the Add Name/ Passwords menu, activate the Edit Password Directory Menu as described in Section 5.4.2, then type 1 and press [[...]

5-7 Confi guration 6. Port Access: The ports that this password will be allowed to create connections with. Note that several passwords can provide access to the same port. T o select ports, type 6 , press [Enter] and follow the instructions in the resulting submenu. 7. Save Entry: Note that if you exit from the menu without first saving, the pas[...]

5-8 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 5.4.1.3. Deleting the Entire P assword Directory The Edit Password Directory menu (Figure 5.2) also allows you to delete the entire password directory , rather than accessing each individual password and deleting them one at a time. T o delete the Password Directory and clear all pass[...]

5-9 Confi guration 3. Edit Password Directory: From the System Parameters Menu, type 5 and press [Enter] to display the Edit Password Directory Menu. At this point, you may either define new passwords that use the Dial Back Function, or alter existing passwords to include the Dial Back Function. The following parameters should be defined in the [...]

5-10 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 5.5. Port Configuration 5.5.1. Configuration Conventions When responding to prompts, invoking commands, and selecting items from port configuration menus, note the following: • T o select an item from a Port Configuration menu, key in the number for the item and press [Enter] . ?[...]

5-11 Confi guration 5.5.2. Port Modes The APS-8/16M offers four different port operation modes; Any-to-Any Mode, Passive Mode, Buffer Mode, and Modem Mode. The Port Modes function as follows: • Any-to-Any Mode: Allows communication between connected ports. Any-to-Any Mode Ports can be connected to other Any-to-Any , Passive, Buffer , or Modem Mo[...]

5-12 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 5.5.3. RS232 Port Configuration Menus The Port Configuration Menus are used to select options for each of the APS-8/16M’ s RS232 ports. Parameters selected via these menus will stay in effect until the unit is initialized or the /P command is used to reconfigure the port. After i[...]

5-13 Confi guration The Port Configuration menu offers the following options: 1. Port Name: (Up to 16 characters) Assigns a name to the port. • (APS-8M Defaults: Ports 1 through 7 = undefined; Port 8 = "Internal_Modem"). • (APS-16M Defaults: Ports 1 through 16 = undefined; Port 17 = "Internal_Modem"). 2. Baud Rate: Selec[...]

5-14 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide When the Port Mode is set to Modem Mode, the menu will include additional prompts (see Figure 5.6), which are used to define the following: 61. Reset String: If necessary , this prompt can re-define the modem reset string, which is sent prior to the Initialization string. (Up to 48[...]

5-15 Confi guration 7. Supervisor Mode: Permits or denies access to Supervisor Mode at this port. When enabled (Permit), and a password that permits Supervisor Mode is entered, the port will allow access to Supervisor Mode commands. When disabled (Deny), the port will not enter Supervisor Mode, even when a password that normally permits access to [...]

5-16 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 10. Timeout Disconnect: Enables and selects the T imeout Period for this port. If enabled, and the port does not receive or transmit data for the specified T imeout Period, the port will disconnect. In Any-to-Any Mode, Passive Mode, or Buffer Mode, the default setting for this item [...]

5-17 Confi guration 5.5.4. The Invalid Access Lockout F eature When properly configured and enabled, the Invalid Access Lockout feature will watch all login attempts made at a given port. If the port exceeds the selected number of invalid attempts, then that port will be automatically disabled for a user-defined length of time. Note that when an[...]

5-18 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 5.6. Copying Parameters to All P orts The /CP command (Copy Port Parameters) provides a convenient means for selecting similar parameters for all APS-8/16M RS232 ports. When the /CP command is invoked, the unit will display a menu which allows you to select port communication paramet[...]

5-19 Confi guration T o select common parameters for all APS-8/16M RS-232 ports, proceed as follows: 1. Access command mode. If the password prompt is displayed, key in a password that permits Supervisor Mode. 2. At the command prompt, type /CP and press [Enter] , the menu shown in Figure 5.7 will be displayed. 3. Selecting Parameters: T o select [...]

5-20 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide[...]

6-1 6. The Internal Modem This section lists commonly used A T commands for the APS-8/16M’ s internal modem, and briefly describes the procedure for communicating with the internal modem. Please note that although APS-8/16M includes an internal modem, any APS-8/16M RS232 port can also be configured for connection to an external modem. 6.1. Comm[...]

6-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 6.2. Common A T Commands This section lists some of the most commonly used A T commands for the APS-8/16M’ s internal modem. For a complete listing of all available A T Commands and S-Registers, please refer to the "MT5634 Modem A T Command Set" document at http://www .wti[...]

6-3 The Internal Modem Command F unction/Options &D n Data T erminal Ready (DTR) Control. &D0 Modem ignores true status of DTR signal and responds as if it is always on. &D1 If DTR drops while in online data mode, the modem enters command mode, issues an OK, and remains connected. * &D2 If DTR drops while in online data mode, the mo[...]

6-4 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide Command F unction/Options I n Information Request I0 Display default speed and controller firmware version. I1 Calculate and display ROM checksum (e.g., 12AB .) I2 Check ROM and verify the checksum, displaying OK or ERROR I3 Display default speed and controller firmware version. I4 [...]

7-1 7. The Status Screens The APS-8/16M Status Screens display the connection status and communication parameters for the RS-232 ports. Basically , There are four different status screens; The Port Status screen (/S), the Port Diagnostics screen (/SD), the Port Parameters screens (/W), and the V iew Password Directory screen. 7.1. The Port Status S[...]

7-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide As shown in Figure 7.1, The Port Status Screen lists the following: • Name: The user -defined name for each port. • Command Access: Indicates if the corresponding port has been disabled by the Invalid Access Lockout feature. If this column reads "Locked", then the defi[...]

7-3 The Status Scr eens As shown in Figure 7.2, the Port Diagnostics Screen lists the following: • Port: The Port Number . • Name: The user -defined name for each port. • Status: The connect status for each port. When the port is connected, this column will list the number of the other port that is connected to this port. Note that if this c[...]

7-4 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 7.3. The Port P arameters Screens (/W) The /W command displays more detailed information about an individual APS-8/16M port. Rather than listing connection information for all ports like the Port Status Screens, the Port Parameters screen lists all defined parameters for a specific [...]

7-5 The Status Scr eens As shown in Figure 7.4, the Password Directory Screen lists the following: • Name: The username for each password. Note that the username is not entered during login, and is used for descriptive purposes only . • Password: If a password has been defined for the corresponding username, this column will read "define[...]

7-6 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide[...]

8-1 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 command mode and issuing the /C Command. All ports can be configured for the Any-to-Any Mode. 8.1.1. Port Connection and Disconnection The APS-8/16M provides communication between devices without the[...]

8-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide T o connect ports, proceed as follows: 1. Access command mode as described in Section 5.1. If the Password Prompt is displayed, enter a password that permits Supervisor Mode. 2. Invoke the /C command to connect the desired ports. a) Resident Connect: T o connect your resident port to [...]

8-3 Operation T o disconnect ports, proceed as follows: 1. Resident Disconnect: Disconnects your resident port from another port. For example, if you are communicating via Port 3, and Port 3 is connected to Port 4, a Resident Disconnect would be used to disassociate the two ports. The APS-8/16M offers two dif ferent Resident Disconnect command form[...]

8-4 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 3. No Activity Timeout: Providing the T imeout Disconnect feature is enabled at either connected port, a No Activity T imeout can disconnect Resident Ports, or Third Party Ports. a) RS232 Ports: T o configure the T imeout Disconnect Feature for the RS232 Ports, invoke the /P command [...]

8-5 Operation 6. Y our port will be connected to the first available port in the group. If all ports are presently connected, the APS-8/16M will respond with a "BUSY" message. 7. It is only necessary to enter enough letters of the port name to differentiate Hunt Group ports from other ports. T ype an asterisk (*) to represent the remaini[...]

8-6 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 8.2. Passive Mode Passive Mode Ports function the same as Any-to-Any Mode Ports, but do not allow access to command mode. A Passive Mode Port can communicate with other ports, but cannot enter command mode, and therefore cannot invoke commands to redefine port parameters, display sta[...]

8-7 Operation 8.3.1. Reading Data from Buffer Mode P orts T o retrieve data from Buffer Mode Ports, you must first determine which port buffers contain data. T o check port buffers for stored data, access command mode and type /S [Enter] to display the Port Status Screen. T o retrieve data from buffer memory , go to a free Any-to-Any or Modem Mode[...]

8-8 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 8.3.2. Port Buffers The Status Screen lists the amount of Buffer Memory currently used by each port. The APS-8/16M uses buffer memory in two dif ferent ways, depending on the user-selected port mode. • Any-to-Any , Passive, and Modem Mode Ports: When two ports are communicating at d[...]

8-9 Operation Notes: • When a Modem Mode Port exits command mode, or the DCD line is lost while command mode is active, the APS-8/16M will pulse the DTR line to the modem. The unit will then send the user -defined modem command strings to make certain the modem is properly disconnected and reinitialized. • All APS-8/16M RS232 ports can use bot[...]

8-10 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide[...]

9-1 9. Saving and Restoring Configuration Parameters After the APS-8/16M has been 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 unit without the need to manually re-assign[...]

9-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 9.2. Restoring Saved P arameters This section describes the procedure for using your communications program to send stored parameters to the APS-8/16M. 1. Start your communications program and access the APS-8/16M command mode; if the password prompt is displayed, enter a password tha[...]

10-1 10. Upgrading APS-8/16M Firmware When new , improved versions of the APS-8/16M operating firmware become available, the /UF (Upgrade Firmware) function can be used to update the APS-8/16M unit to the new firmware version. Updates can be uploaded to the unit via SetUp Ports one and two, or via the Internal Modem Port. T o install a firmware [...]

10-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 4. Use your communication program’ s (e.g. HyperT erminal’ s) upload function to transfer the upgrade firmware to the unit. Select ASCII file format, and then specify the filename and directory location where the firmware upgrade file resides. Note: The Upload function will [...]

11-1 11. Command R eference Guide 11.1. Command Conventions The commands described in this section conform to the following conventions: • Slash Character: Most APS-8/16M 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[...]

11-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 11.2. Command Response When commands are sent to the APS-8/16M, the unit can respond with either verbose (English T ext) or terse messages (numeric / abbreviated). In the default state, all ports will send verbose command responses. After the unit is installed and configured, the po[...]

11-3 Command Refer ence Guide 11.3. Command Summary Function Command Syntax Command Availability Supervisor Non-Supervisor Enter Command Mode [Enter] X X Exit Command Mode /X [Enter] X X Help Menu /H [Enter] X X Display Site ID /J [Enter] X X Display Port Status /S [Enter] X  X  Display Port Diagnostics /SD [Enter] X  X  Display Port Pa[...]

11-4 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide 11.4. Command Set This section provides more detailed information on all APS-8/16M commands, sorted alphabetically by name. [Enter] Enter Command Mode In order to set parameters or connect ports, you must first access command mode as described in Section 5.1. When command mode is in[...]

11-5 Command Refer ence Guide /C Connect Establishes a bidirectional connection between two ports. For more information and command line examples, please refer to Section 8.1. There are two types of port connections: • Resident Connect: If the /C command specifies one port name or number , your resident port will be connected to the specified p[...]

11-6 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide /D Third Party Disconnect Invoke the /D command at your resident port to disconnect two other ports. The /D command cannot be used to disconnect your resident port. T o disconnect your resident port, issue the Resident Disconnect Sequence or wait for the T imeout Period to elapse (if[...]

11-7 Command Refer ence Guide /F Set System Parameters Displays a menu which is used to define the Site ID message and other global parameters. Also allows access to the "Add Password" function. For more information, please refer to Section 5.4. A vailability: Supervisor Mode Only Format: /F [Enter] Response: Displays System Parameters M[...]

11-8 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide /P Set RS232 Port P arameters Displays a menu which allows the user to select options and parameters for the selected port. Section 5.5.3 describes the procedure for defining port parameters. A vailability: Supervisor Mode Only Format: /P [x] [Enter] Where x is the number or name of[...]

11-9 Command Refer ence Guide /U Save Parameters Sends configuration parameters to an ASCII text file as described in Section 9. A vailability: Supervisor Mode Only Format: /U [Enter] Response: The APS-8/16M will send a series of command lines. /UF Upgrade Firmware When new versions of the APS-8/16M operating firmware become available, this comm[...]

11-10 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide /W Display Port P arameters (Who) Displays detailed configuration information for an individual port. Ports with User Level command capability cannot display parameters for other ports. If you have logged into command mode using a port and password that permit Supervisor Mode, the [...]

Apx-1 A . RS232 Port Interface DCD and DTR hardware lines function as follows: 1. When connected: a) If either port is set for Modem Mode, the DTR output at either port reflects the DCD input at the other end. b) If neither port is set for Modem Mode, DTR output is held high (active). 2. When not connected: a) If the port is set for Modem Mode, up[...]

Apx-2 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide B. Specifications RS232 Port Interface: • APS-8M & APS-8M-DC: Seven (7) RS232 serial inputs use DB9 connectors configured as DTE ports . • APS-16M & APS-16M-DC: Sixteen (16) RS232 serial inputs use DB9 connectors configured as DTE ports. Internal Modem Interface: RJ1 1[...]

Apx-3 Appendices C. Customer Service Customer Service hours are from 8:00 AM to 5:00 PM, PST , Monday through Friday . When calling, please be prepared to give the name and make of the unit, its serial number and a description of its symptoms. If the unit should need to be returned for factory repair it must be accompanied by a Return Authorization[...]

Apx-4 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide D. T rademark and Copyright Information WTI and W estern T elematic are trademarks of W estern T elematic Inc.. All other product names mentioned in this publication are trademarks or registered trademarks of their respective companies. Information and descriptions contained herein [...]

Apx-5 Appendices E. R egulatory Statements FCC Part 15 R egulation This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. [...]

Apx-6 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide If trouble is experienced with this equipment, for repair or warranty information, please contact W estern T elematic, Inc. at 1-800-854-7226. If the equipment is causing harm to the telephone network, the telephone company may request that you disconnect the equipment until the pro[...]

Index -1 Inde x A Accept Break 5-16 Activity LEDs 2-1 AC Powered Units 4-1 Adding Passwords 5-6 Add Name/Password 5-5 Dial Back Number 5-6 Name 5-6 Password 5-6 Port Access 5-7 Supervisor Mode 5-6 Any-to-Any Mode 5-1 1 A T Commands 6-1 to 6-4 B Baud Rate 5-13 Bits 5-13 Breaks 5-16 Buffer Mode 5-1, 5-1 1, 8-6 Port Buffers 8-8 Reading Data 8-7 C CLEA[...]

APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide Index -2 N Name 5-6 No Activity T imeout 8-4 O One Character Disconnect 5-15, 8-3 ON Indicator 2-1 Operation 8-1 to 8-9 P Parameters Saving and Restoring 9-1 to 9-2 Parity 5-13 Passive Mode 5-1, 5-1 1, 8-6 Passwords 5-2 to 5-4 Adding 5-6 to 5-7 Editing and Deleting 5-7 to 5-8 Password Dir[...]

Index Index -3 T T erminal Block 4-1 T erse Response 5-16, 1 1-2 Third Party Connections 8-1 Third Party Disconnect 8-3, 1 1-6 Three Character Disconnect 5-15, 8-3 T imeout 8-4 T imeout Disconnect 5-16 U Unlocking Ports 5-17 Unlock Ports 1 1-9 Upgrade Firmware 1 1-9 Upgrading Firmware 10-1 to 10-2 User Name 5-6 V V erbose Response 5-16, 11-2 W W ar[...]

Index -4 APS-8M / APS-16M Asynchronous Port Switches; User’ s Guide[...]

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5 Sterling • Irvine • California 92618 (949) 586-9950 • T oll F ree: 1-800-854-7226 F ax: (949) 583-9514 • http://www.wti.com[...]