The ID-4 is a solid state electronic device designed to monitor alarm conditions up to 4 different conditions. The ID-4 will monitor either normally open or normally closed sustained dry contacts. Each alarm condition which is to be monitored by the ID-4 should have a set of contacts which either close or open upon an alarm condition. A pair of wires is connected from this alarm contact to the ID-4 barrier terminal located inside the enclosure . The barrier terminal uses two individual screw down lugs for each channel. It is unimportant which one of the wires from the alarm contact is connected to which alarm terminal. It is important that the pair be connected to the corresponding pair of terminal lugs assigned to the channel being monitored. This pair of wires from the alarm contact will not have any current or voltage on the pair generated from the alarm source. The ID-4 generates a low voltage signal which uses the pair of wires. When the circuit is in alarm, (in the case of a normally open contact) the low voltage generated by the ID-4 is sent out on one wire and is returned on the other wire. This will cause the LED associated with the alarm channel which is now in alarm to turn on. Conversely if the contact type was of the normally closed type the LED on the alarm board would be on all of the time and an alarm condition would extinguish the LED.
The alarm board is a small plug in board 4 X 5 inches and has a label on the board which says 'ALARM BOARD'. This board is located above the main circuit board on the lower left side of the ID-4. The alarm board contains four LED's which will illuminate when the circuit is completed and will extinguish when the circuit is open.
The source of the low voltage current used to monitor the alarms is generated from the 12 volt power supply unit located on the same board. The onboard resistors act as current limiting devices for the circuit. The alarm board uses a unique approach to limiting the transients signals which are generated from the outside world and which would be transferred to the main board. This is done with opto couplers. An analogy would be a "magic ditch" separating the outside world from the main board. This "magic ditch" will not allow any high current to travel from one side to the other. On the side which is closed to the outside world, a person stands and waits for a signal from the outside contacts. The other side is where the microprocessor and other circuitry reside. The person on the side which is closest to the world has a flood light. When the alarm condition is activated the person on the side with the flood light turns on the light and shines across the "magic ditch" to the second person. The second person on the side of the main board then presses a button and sends a small controlled signal to the main board advising the main board that there is an alarm. This way no transients or high voltage can get to the main processor board. This will virtually eliminate the damage to the main board from outside power sources. Should lightning strike it is possible that the small alarm board would be destroyed but the main board would survive. The cost of the small board would be less than One Hundred dollars compared to many times that cost for the main board which houses the microprocessor.
The alarm board is easily removed if required by removal of two screws and withdrawing the board from the edge card connector and the removal of one plug in ribbon. Replacement is the reverse procedure and no alarm contact wires are disturbed or removed during the replacement of the alarm board. This provides an inexpensive way to protect the main board from high voltage surges. Each plug-in ribbon connector is keyed so that a misconnected cable is highly unlikely.
In addition each ID-4 is equipped with a two line sixteen segment LED display. This LED displays the time of day and many other message functions. These other function are fully discussed in the ID-4 PROGRAMMING INSTRUCTIONS booklet.
An OPTIONAL ALARM TRANSMITTER BOARD may be installed. This board, when installed and programmed, will allow the ID-4 to call a pre assigned telephone number and deliver the alarm conditions to a printer receiver in addition to calling and delivering a voice message. If this option is installed please refer to the instructions included with that board for the operation and setup of the transmitter.
There are several additional buttons and switches which are on the ID-4 which will be covered now.
The main reset switch. This switch will reset the microprocessor when depressed. The switch is ordinarily not used but is provided should the need to reset the processor exist.
The LINE/LOCAL switch. This switch will select either the ID-4 telephone hand set when in the LOCAL position or the incoming telephone line if the switch is placed in LINE. To program the unit at the site the switch is in the LOCAL position. During all other normal operational times the switch is in the LINE position.
Menu access push button. This push button is used by the operator while at the dialer to access the MAIN MENU. The LINE/LOCAL switch must be in the LOCAL position so that the hand set tones will be connected to the main board. To access the MAIN MENU the operator depresses the Menu access push button until the ID-4 recognizes the request.
The LOCAL RESET push button will allow the operator to reset the alarm time delays back to the default time previously selected and clear the ACKNOWLEDGMENT LED on the status board.
The ID-4 has four toggle switches which will allow the operator to selectively bypass any or all of the four alarms. When a alarm is bypassed the LED associated with the alarm still functions, but the ID-4 unit will not recognize and act upon an alarm condition if the corresponding switch is toggled on. Switch one is for channel one; switch two is for channel two etc..
The A/C POWER switch is generated from a 16 VAC transformer plugged into a 110V A/C duplex receptacle (furnished by others).
ELECTRICAL REQUIREMENTS
The ID-4 requires a PRIVATE CIRCUIT 115V A/C 60 cycle single phase line duplex outlet which is fused with a 15 amp breaker at the source. This duplex receptacle should be located near the ID-4. This outlet is used to plug in the 16V A/C transformer which is furnished with the ID-4. This transformer provides power to a power supply card which is connected to the ID-4.
TELEPHONE SERVICE
Telephone service is required for the ID-4 to call out and notify personnel of the alarm conditions. The type service required is the same type telephone service you would have in you home or office. The telephone line must be capable of calling out on touch-tone. Leased or dedicated telephone circuits are not required and will not work if installed. Terminate the telephone line in the supplied telephone terminal block. This requires a red wire and a green wire. The TIP and RING pair and ground is all that is required for installation of the phone service.
Updated 3/98