------------------------------------------------------------------------------- -------------------------------- Topic #1 ----------------------------------- ------------------------------------------------------------------------------- ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ» º This tutorial describes Computer Sentinel which monitors 1 or 2 º º unattended remote access computer modems and provides automatic º º recovery if the computer(s) become locked up. º º º º The SENTINEL was designed for easy installation and set up. It works º º in an office environment or with a BBS system. More than two modems º º can be monitored by daisy chaining multiple SENTINELs together. º ÇÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄĶ º This tutorial consists of the following topics: º º º º 1. This screen you are now reading 7. Sentinel Functional diagram º º 2. What does the Sentinel do? 8. Sentinel Single Modem diagram º º 3. Wide area BETA Test Program 9. Sentinel Multitasking diagram º º 4. Condensed Installing Instructions 10. Sentinel LAN Network diagram º º 5. Condensed Operating Instructions 11. Sentinel Daisy Chain diagram º º 6. How to order the Sentinel 12. Sentinel Power Cycle diagram º º º º All this information be downloaded as SNTLLITx.ZIP [latest revision # (x)] º ÈÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ ------------------------------------------------------------------------------ ------------------------------ Topic #2 ------------------------------------ ------------------------------------------------------------------------------ What does the Computer Sentinel do? The COMPUTER SENTINEL is a microcontroller intelligent hardware device that has a single purpose. It keeps unattended remote access personal computers available for remote access. The SENTINEL monitors the modem signals and detects when the modem is no longer available for calls. The SENTINEL operates automatically and requires no operator intervention to perform its task. When the SENTINEL determines that the computer is no longer accessible, it resolves the problem using your pre-configured parameters that are stored in the SENTINEL during its installation. The goal of these configuration options is to honor your specific computer system requirements and get the computer back on-line and available for remote access. This is accomplished by restarting the computer. When the computer is restarted, your computer batch files will bring the system back to your desired status. Many unattended computers perform file maintenance activities (EVENT) at a pre-determined time. The SENTINEL provides a watch dog timer which monitors for the event completion. If the EVENT doesn't complete within the specified amount of time, the SENTINEL restarts the computer to recover from the EVENT lockup. System Hardware Requirements The SENTINEL works with any personal computer system which uses an external Hayes compatible modem. Just plug it in and forget about it. Menu driven support utility software is included which operates on IBM PC compatible computers. This utility is only needed for configuration changes to the SENTINEL, and the factory defaults serve most system requirements without modification. Because the SENTINEL uses no IBM PC computer processing resources, it does not require any specific computer hardware requirements. Any existing hardware combinations that support your application without the SENTINEL, will also operate with the SENTINEL. The SENTINEL remains outside the associated computer, contained within its own case, and has its own power source. The SENTINEL supports all modem operational baud rates, including the new 38.4K baud and beyond. It has a front panel status indicator and a front panel control switch. If you order the optional second port, each port has its own status indicator and control switch. The Configuration parameter change utility program communicates to the SENTINEL with the serial port that is to be monitored. A Sentinel satellite unit receives the serial port modem cable, and plugs onto the modem data jack. In other words, the satellite plugs in-between the modem and the serial port cable of the computer. The satellite unit connects to the SENTINEL with its own cable, and allows the SENTINEL to monitor the modem status. If the SENTINEL is used for Bulletin Board System (BBS) monitoring, it can optionally monitor a second modem port for a total of two modem ports. It can also interact with other SENTINELS for multi-server Local Area Network (LAN) BBS systems greater than two modem nodes. If you are operating multi-node BBS software on one computer, the SENTINEL can be installed on one port and will detect lockups which affect all ports. What problems can render your computer inaccessible? There are basically three things that can go wrong with your computer system that inhibits remote access capability. One is that the computer itself can get confused or locked-up. This means that for some reason it is unable to function properly. Several things can cause this situation. File I/O access can fail on random occasion, forcing the computer to wait until an operator performs a RETRY command before continuing. A random memory parity error is another situation which can cause the computer to become locked-up. Another situation is when a momentary power failure locks-up the computer's power supply. This is referred to as a "crowbar" situation which means that the computer power supply saw a momentary overload (due to the brief power fluctuation) and shut itself down for self protection. To exit from this crowbar lock-up, power must first be turned OFF to the computer power supply and then turned back ON. This same momentary power interruption can also confuse smart modems and can cause them to lock-up. The third situation that can render your computer inaccessible, is when the application software gets confused. This can happen as a result of a burst of noise coming down the phone line, or can happen due to complex interaction of software packages. Today, many systems are using multi-tasking software which adds another dimension of failure possibilities. If your system is connected to a Local Area Network (LAN), then that environment can also cause your computer to loose control of the situation. How does it know when the computer is no longer accessible? All remote access communications software controls the modem by using modem commands. The communications software also monitors modem lead states to determine the modem's status. The SENTINEL monitors modem commands, modem lead states, and modem responses to determine the status of the entire remote access system. When your remote access system becomes inaccessible, it appears from the caller as one of two possible conditions. Either the line is busy and therefore inaccessible, or the modem answers but remains dead with no interaction after the call is connected. With the SENTINEL satellite unit installed between the computer and its modem, it has the opportunity of observing the computer, the modem, and the phone line status. By analyzing the actions of these three entities, the SENTINEL can readily detect a lock-up while the modem is either on-hook or off-hook, and take immediate corrective action. This corrective action results in restarting the computer. When the computer is restarted, your batch files start up the computer and restore normal operations. This is accomplished in one of two possible ways. The first approach, is to simulate pressing the computer RESET switch if one exists. This is done electrically by the SENTINEL instead of mechanically as an operator would do. If your computer does not have a RESET switch, then the other method of restarting the computer is to turn OFF power to the computer for a specified number of seconds, and then turn the power back ON. This is referred to as a POWER CYCLE. This will cause the computer to forget its past problems and start up fresh and new. The SENTINEL can also use a combination of these two methods. It can use the RESET approach first, and if that fails, resort to the POWER CYCLE approach. If both of these approaches fail, then there is a computer hardware problem and the SENTINEL limits POWER CYCLE attempts, to prevent further damage to your system. How is power cycled to the computer/modem by the COMPUTER SENTINEL? The SENTINEL uses optional Plug-n-Power modules which are sold at your local Radio Shack store. These modules are U/L approved and allow the SENTINEL to cycle power to the computer and/or the modem, when necessary. The SENTINEL connects directly to the Plug-n-Power Universal Interface Control Module, which is Radio Shack part number 61-2687. This module, in turn, controls other Universal Appliance Power Modules, which are Radio Shack part number 61-2684. You would plug your computer and/or modem into the Universal Appliance Power Module. Operational Status Indicators. The SENTINEL has a front panel LED status indicator and a control switch. Together, they provide continuous indication of what the SENTINEL is doing. Although these front panel functions are not used for unattended operation, they are handy for system installation, maintenance, and monitoring. The control switch can change the active/disabled state of the SENTINEL, and can also display the number of previous restarts that may have occurred. This permits manual control while the modem is in use, and provides status of your system. Below is a list of the available status displays: 1. "Test" mode, status indications only, no restarts 2. "Active" and monitoring the system operation 3. "Disabled" and not monitoring the system 4. "Recovery" mode, caller just now disconnected 5. "Pending" warning, restart is about to take place 6. "Restart" mode, currently restarting the computer 7. "Command" mode, awaiting configuration changes 8. "Connected", caller's modem carrier is present 9. "Event" mode, event watchdog timer is active 10. "Save" mode, updating the non-volatile configuration Installation Configuration Options. The SENTINEL has been designed for maximum application compatibility and ease of installation. Listed below are some of the configuration menu options. They are available for unique applications, but the factory default values are adequate for most systems. Power-on Mode Hangup Response Time Max DTR Cycles Restart Recovery Mode Type of Port Restart Method Max Dead Time Pre-Restart Delay Max Unanswered Rings Restart Duration Event Timer Duration Post-Restart Pause We currently offer a limited time, Wide Area BETA Program, with substantial price reduction. For details, call: ACCESS SOLUTIONS CORPORATION 18 Ivy Lane Cherry Hill, NJ 08002 609-667-7628 Voice 609-667-5652 BBS -------------------------------------------------------------------------- ---------------------------- Topic #3 ---------------------------------- -------------------------------------------------------------------------- COMPUTER SENTINEL Wide Area BETA Test Program 06/AUG/91 We are offering the opportunity for a limited number of customers to participate in our wide area beta test program. The purpose of this program is to get the Sentinels installed in numerous applications for customer use validation. We offer a significant price reduction for participants of this program as incentive for your co-operation. The retail price of the SENTINEL unit will be $289.00 with a second node option for $30.00 more. The BETA Test Program offers two node SENTINELs for $144.00 plus shipping and handling. If you are interested in participating in this BETA program, you must call 1-609-667-7628 and request an official application form. If the first line is busy, you may get an answering machine on the alternate line. Just leave your full name, phone number and mailing address and we will send out the application form the same day. Phone orders for BETA units will not be accepted, only orders on our official application form will be honored. The first group of properly completed application forms with enclosed payment, will be guaranteed BETA test units. Applications honored will be limited in quantity. First come, first serve. If you are interested, now is the time to call. -------------------------------------------------------------------------- --------------------------- Topic #4 ---------------------------------- -------------------------------------------------------------------------- Computer Sentinel Condensed Installation Instructions 05/23/91 1. Unplug the computer serial port cable from its associated modem. Plug the Sentinel Satellite unit onto the modem and then plug the serial cable onto the Sentinel Satellite unit. 2. Plug the Sentinel Satellite ribbon cable into jack J1 of the Computer Sentinel. This J1 is located at the rear of the Computer Sentintel and is clearly labled. 3. If you have the second port option, repeat steps 1 and 2 using J2 of the Computer Sentinel and the second Sentinel Satellite unit. 4. Plug the provided Power-Pack cable into P1 on the rear of the Computer Sentinel. Now plug the Power-Pack into a house current wall outlet. 5. At this time the Computer Sentinel should display an "A" or "c" on the Port-A display. The "c" means that the serial port DTR lead is low and the modem is not in use. This is called the command mode, because modems are never used when DTR is low. Therefore, if DTR is low, the Sentinel reads the serial port looking for commands. When DTR is high, the Sentinel ignores the serial port data in case modem data looks like a Sentinel command. When you start to use that modem, the "c" will change to an "A" which means that the Sentinel is activated and monitoring the port. 6. Now you must interface the Computer Sentinel to the computer to cause it to restart when it gets locked up. One way to do this is to install the reset cable from the computer to the Computer Sentinel, J3. This will enable the Sentinel to electrically press the computer reset switch when a lockup occurs. The instructions for installing this cable are given in the user's manual. If you don't wish to install the reset cable, or if your computer doesn't have a reset switch, you can purchase and use Radio Shack Plug-n-Power modules. These modules will allow the Sentinel to remove power from the computer, and then reapply power effecting a restart. The instructions for installing these optional power modules are given in the user's manual. 7. This completes the hardware installation of the Sentinel device. The default Sentinel parameters are sufficient for most systems, but if you wish to modify these parameters, use SNTLCFG.EXE which is a utility for changing the desired parameters within the Sentinel. 8. If you wish to use the EVENT timer feature, you must modify your event batch file to call SNTLEVON.COM to start the event timer. When the event is completed, the event batch file must call SNTLEVOF.COM which will disable the EVENT timer. Refer to the user's manual for further details. ----------------------------------------------------------------------- --------------------------- Topic #5 -------------------------------- ----------------------------------------------------------------------- COMPUTER SENTINEL Condensed Operating Instructions 7/26/91 1. Only Port-A of the SENTINEL will recognize commands from the computer. Port-B can only monitor port status. 2. To activate the SENTINEL, use the file SNTL.EXE [ON] which will cause the display to show "A" which means the SENTINEL is now activated and is monitoring the system. You can also use the front panel control switch to toggle the SENTINEL active. 3. To disable the SENTINEL, use the file SNTL.EXE [OFF] which will cause the display to show "d" which means the SENTINEL is now disabled. You can also use the front panel control switch to toggle the SENTINEL Disabled. 4. To RESET the SENTINEL, use the file SNTL.EXE [RESET]. This is the same as powering up the SENTINEL for the first time. 5. To start the EVENT TIMER function, use the file SNTL.EXE [EVENTON]. When this utility is executed, the display blinking dot will go OFF and remain off until SNTL.EXE [EVENTOFF] is executed which cancels the EVENT TIMER. Any action which changes the SENTINEL state from active to disabled, or vice- versa, will also cancel the EVENT TIMER. Any restart performed by the SENTINEL will also cancel the EVENT TIMER. 6. To place the SENTINEL in TEST mode, use the file SNTL.EXE [TEST]. While in the test mode, the display blinking dot will remain steady ON. While in the test mode, the display status will work but the computer(s) will not be restarted. If you have two or more SENTINELS daisy chained together, remember to place all sentinels in TEST mode. To exit this test mode, momentarily press the front panel control switch, or use SNTL.EXE [RESET]. 7. The display indications have the following meaning; "A"=Activated, "d"=disabled, "r"=recovery mode, "0-9"=counts remaining until restart, "H"=hard restart in progress, "P"=pause after restart, "S"=save new config, "="=successful command, "F"=unsuccessful command, "b"=faulty new cfg data, "n"=carrier connect, "c"=command mode (DTR low), blinking dot=normal operation, constant dot=test mode, no dot=event timer activated. 8. The SENTINEL is delivered with the following default parameters. Use SNTLCFG.EXE to modify for unique applications: HANGUP RESPONSE TIME - Number of seconds allowed for this port to recover from caller hang-up. If no response within this time, force a restart. Default = 60. [10-255] MAX DEAD TIME - Maximum number of seconds since the system last had a valid caller. If this time elapses, a forced restart will result. 0000 disables, Default = 00000. [0000-65000] PRE-RESTART DELAY - Once a forced restart is scheduled for this port, this is the number of seconds delay before conducting the restart. Default = 1. [1- 255] RESTART DURATION - How many seconds the forced restart will last. During this time the computer is held reset and/or the power remains off. Default = 4. [2- 255] POST-RESTART PAUSE - After the restart duration has expired, this is the number of seconds delay before the Sentinel begins monitoring again. Default = 60. [10-255] MAX UNANSWERED RINGS - This is the maximum number of un-answered rings since last valid caller, before the Sentinel forces a restart. Default = 12. [4-255] MAX DTR CYCLES - This is the maximum number of times since last valid caller, your software can attempt to command your modem on-hook before a restart is forced. Default = 12. [4-255] EVENT TIMER DURATION - Maximum number of seconds before the event watchdog timer expires and forces a restart to recover from an event lock-up condition. Default = 10800. [256-65000] POWER-ON MODE - After a temporary power interruption, this determines whether the Sentinel will wake up ACTIVE or DISABLED. Default = ACTIVE. RESTART RECOVERY MODE - After the Sentinel completes a restart, this determines if it remains ACTIVE or goes to a DISABLED state. Default = ACTIVE. RESTART METHOD - RESET = force reset only. POWER = force power cycle only. BOTH = RESET & POWER together. SEQ = first do RESET then if that fails, do POWER. Default = BOTH. TYPE OF PORT - Defines which ports will force restarts when this port restarts. MASTER means force other ports and other Sentinels. SLAVE forces this port only. Default = MASTER ------------------------------------------------------------------------ --------------------------- Topic #6 --------------------------------- ------------------------------------------------------------------------ How To Order a COMPUTER SENTINEL 06 AUG 91 You are reading advance information about this new product. We don't expect to have it in quantity production until fourth quarter 1991. However, we are currently offering a limited Wide Area BETA Test Program. This program is described under topic #3 in this series of information. If you would like to be placed on our mailing list for product release notices, simply complete SCRIPT #5 on the Liberty Bell BBS, 1-609-667-5652; or call 1-609-667-7628 voice. If you call after hours, an answering machine will record your name, telephone number and address, and we will mail the information the following work day. ------------------------------------------------------------------------------ ------------------------------ Topic #7 ------------------------------------ ------------------------------------------------------------------------------ Computer Sentinel Functional Diagram Port A ÚÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄ¿ Serial cable³ Sentinel ³ ³ Port ³ ÚÄ External reset command from ÄÄÄÄÄÄÄÄÄÄÄÄ´ Satellite ÃÄ´ A ³ ³ other Sentinel units, which ³ Unit-A ³ ³Modem ³ ³ will cause this Sentinel to ÀÄÄÄÄÄÄÄÄÄÂÄÙ ÀÄÄÄÄÄÄÙ ³ restart its computers. ³ ³ ³ Port-A computer ³ ÚÄ External reset command One Satellite ³ restart control. ³ ³ to force other Sentinel module included ³ Connects with ³ ³ units to restart their with each Sentinel. ³ computer reset ³ ³ associated computers. Two included with ³ switch and/or ³ ³ 2nd port option. ³ power control ³ ³ ÚÄÄÄÄ To external ³ module. ³ ³ ³ 9VDC power ³ ÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄ ÚÄÄÄÄÁÄÄÄÄÁÄÄÄÄÄÁÄÄÄ¿ pack unit. ³ ³ ³ J4 J5 P1 ³ ³ ÀÄÄÄÄÄÄÄÄ´ J3 J6 ÃÄ¿ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´ J1 J2 ÃÄÅÄ Optional Port-A Status display indicator ÄÄÄÄÄÄÄÄÄ-³ DSPLYA DSPLYB ³-´ Port-B Port-A Control Switch ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ-³ SWA SWB ³-Ù ³ Computer Sentinel ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ------------------------------------------------------------------------------ ------------------------------ Topic #8 ------------------------------------ ------------------------------------------------------------------------------ Computer Sentinel Single Modem Installation ÚÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄ¿ Port A ³ Port ³ ³ Sentinel ³Serial cable ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³ A ÃÄÄ´ Satellite ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´ Serial Port #1 ³ ³Modem ³ ³ Unit-A ³ ³ ³ ÀÄÄÄÄÄÄÙ ÀÄÄÄÄÄÄÄÄÄÂÄÙ ³ COMPUTER-A ³ ³ ³ ³ ³ ÚÄÄÄÄÄÄÄÄÄÄ´ Reset switch connection ³ Refer to Sentinel ³ ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ power cycle diagram ³ ³ for example of power ³ ³ control use of the ³ ³ Sentinel. ³ ³ ÚÄÄÄÄ To external ³ ³ ³ 9VDC power ³ ³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄ¿ pack unit. ³ ³ ³ P1 ³ ³ ÀÄÄÄÄÄÄÄÄ´ J3 ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´ J1 ³ Port-A Status display indicator ÄÄÄÄÄÄÄÄÄ-³ DSPLYA ³ Port-A Control Switch ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ-³ SWA ³ ³ Computer Sentinel ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ------------------------------------------------------------------------------ ------------------------------ Topic #9 ------------------------------------ ------------------------------------------------------------------------------ Computer Sentinel Multitasking Installation ÚÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄ¿ ³ Port ³ ³ Sentinel ³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄ¿ ³ A ÃÄÄ´ Satellite ÃÄÄ´ Serial Port #1 ³ ³ Sentinel ³ ³ Port ³ ³Modem ³ ³ Unit-A ³ ³ Serial Port #2 ÃÄÄ´ Satellite ÃÄÄ´ B ³ ÀÄÄÄÄÄÄÙ ÀÄÄÄÄÄÄÄÄÄÂÄÙ ³ ³ ³ Unit-B ³ ³Modem ³ ³ ³ Computer ³ ÀÄÄÄÄÄÄÄÄÄÂÄÙ ÀÄÄÄÄÄÄÙ ³ ³ ³ ³ * Configure the ³ ÚÄ´ Reset switch connection ³ ³ Sentinel device ³ ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³ for two server ³ ³ ³ node types, and ³ ³ ÚÄÄÄÄ To external ³ J3 will restart ³ ³ ³ 9VDC power ³ the computer ³ ³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄ¿ pack unit. ³ for both ports. ³ ³ ³ P1 ³ ³ ³ ÀÄÄÄ´ J3 J6 ÃÄÄ Not used * ³ ÀÄÄÄÄÄÄ´ J1 J2 ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ Port-A status indicator Ä-³ DSPLYA DSPLYB ³-Ä Port-B status indicator Port-A control switch ÄÄÄ-³ SWA SWB ³-Ä Port-B control switch ³ Computer Sentinel ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ------------------------------------------------------------------------------ ------------------------------ Topic #10 ----------------------------------- ------------------------------------------------------------------------------ Computer Sentinel LAN Network Installation ÚÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄ¿ ³ Port ³ ³ Sentinel ³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄ¿ ³ A ÃÄÄ´ Satellite ÃÄÄ´ Serial Port #1 ³ ³ Sentinel ³ ³ Port ³ ³Modem ³ ³ Unit-A ³ ³ * Computer-A ³ ÚÄÄ´ Satellite ÃÄÄ´ B ³ ÀÄÄÄÄÄÄÙ ÀÄÄÄÄÄÄÄÄÄÂÄÙ Ú´ Reset switch ³ ³ ³ Unit-B ³ ³Modem ³ ³ ³ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³ ÀÄÄÄÄÄÄÄÄÄÂÄÙ ÀÄÄÄÄÄÄÙ ³ ³ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³ ³ * Configure the ³ ³³ Serial Port #1 ÃÄÄÄÄÄÄÄÄÙ ³ Sentinel device ³ ³³ * Computer-B ³ ³ for required ³ ³³ Reset switch ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³ node types, if ³ ³ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙÚÄÄÄÄ To external ³ ³ one of these ³ ³ ³ 9VDC power ³ ³ computers is a ³ ³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄ¿ pack unit. ³ ³ slave node. ³ ³ ³ P1 ³ ³ ³ ³ ÀÄÄ´ J3 J6 ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³ ÀÄÄÄÄÄÄ´ J1 J2 ÃÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ Port-A status indicator Ä-³ DSPLYA DSPLYB ³-Ä Port-B status indicator Port-A control switch ÄÄÄ-³ SWA SWB ³-Ä Port-B control switch ³ Computer Sentinel ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ------------------------------------------------------------------------------ ------------------------------ Topic #11 ----------------------------------- ------------------------------------------------------------------------------ Computer Sentinel Daisy Chain Installation Unit-I has one or more LAN server nodes. Unit-II has one or more LAN server nodes. Unit-III has no LAN server computers, only slave nodes. If Unit I or II restarts, so will all three units and associated nodes. #1-#4 are cables required for daisy chaining this system. All cable connections are optically coupled for electrical isolation. ÚÄÄÄÄÄÄÄÄÄÄÄÄÄ#3ÄÄÄÄÄÄÄÄÄ¿ ³ÚÄ#1¿ ³ÚÄÄÄÄÄÄÄÄÄÄ#4ÄÄÄÄÄÄÄÄÄÄÄ¿ ³³ ³ÚÄÄÄÄÄÄÄ#2ÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³ ³³ ³³ ³³ ³ ³ ÚÄÄÄÁÁÄÄÄÁÁÄÄÄÄÄÁÄÄÄ¿ ÚÄÄÄÁÁÄÄÄÁÁÄÄÄÄÄÁÄÄÄ¿ ÚÄÄÄÁÁÄÄÄÁÁÄÄÄÄÄÁÄÄÄ¿ ³ J4 J5 P1 ³ ³ J4 J5 P1 ³ ³ J4 J5 P1 ³ ´ J3 J6 à ´ J3 J6 à ´ J3 J6 à ´ J1 J2 à ´ J1 J2 à ´ J1 J2 à ´ DSPLYA DSPLYB à ´ DSPLYA DSPLYB à ´ DSPLYA DSPLYB à ´ SWA SWB à ´ SWA SWB à ´ SWA SWB à ³ Computer Sentinel ³ ³ Computer Sentinel ³ ³ Computer Sentinel ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ Unit-I Unit-II Unit-III ------------------------------------------------------------------------------- ------------------------------ Topic #12 ------------------------------------ ------------------------------------------------------------------------------- Computer Sentinel Power Cycle Diagram ÚÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ³ Port ³ ³ Sentinel ³ ÚÄ´ Serial Port #1 110VACÃÄÄÄ´Radio Shack ³ ³ A ÃÄÄ´ Satellite ÃÄÙ ³ ³ ³Appliance module³ ³Modem ³ ³ Unit-A ³ ³ COMPUTER-A ³ ³# 61-2684 ³ ÀÄÄÄÄÄÄÙ ÀÄÄÄÄÄÄÄÄÄÂÄÙ ³ ³ ÀÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÙ ³ ÚÄ´ Reset switch connection ³ ³ ³ ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³ Note that J3 can have ³ #1 ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿ ÚÄÄÄÄÄÄÄÄÄÄÄÁÄÄ¿ two cables connected ³ ³ ³Radio Shack ³ ³ 110VAC House ³ to it. #1 goes to ³ ³ÚÄ#2ÄÄ´Plug-n-power ÃÄÄÄÄÄÄ´ wall outlets ÃÄÄ¿ the computer reset ³ ³³ ³control module³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³ switch. And #2 goes ³ ³³ ³#61-2687 ³ ÚÄÄÄÄÄÄ¿ ³ to the Plug-n-power ³ ³³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ³ ³ ³ control module. The ³ ³³ ÚÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄ¿ ÚÁÄÄÄÄÄÄÄÁÄ¿ optional Radio Shack ³ ³ÀÄÄÄÄÄÄÄÄÄÄÄ¿ ³ P1 ³ ³External ³ modules are UL apprvd ³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄ´ J3 ³ ³9VDC power³ ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ´ J1 ³ ³pack unit ³ Port-A Status display indicator ÄÄÄÄÄÄÄÄÄ-³ DSPLYA ³ ³included ³ Port-A Control Switch ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ-³ SWA ³ ³with each ³ ³ Computer Sentinel ³ ³Sentinel ³ All Sentinel jacks are optically coupled. ÀÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ ÀÄÄÄÄÄÄÄÄÄÄÙ --------------------------- End of SNTLLIT ---------------------------------