Linear D-21A(/K) User's Manual
Contents
1. Select a location for the transmitter and drive screws through the two countersunk holes of the back cover to mount the cover see Figure 4 NOTE Generally the higher the transmitter is mounted above ground level minimum of 3 feet the better the radio range should be STEP 2 For recessed switches with hidden wiring fish the sensor wires through the wire access hole on the back cover With surface wiring route the wire leads through the wire slot on the back cover see Figure 4 Figure 4 Transmitter Back Cover Mounting STEP 3 Attach wires from the sensor switch to the transmitter screw terminals Wire normally closed switches in series and normally open switches in parallel see Figures 5 amp 6 NOTE A maximum of wire run of 50 feet with a total of four switches may be used with one transmitter Figure 5 Normally Open Switch Wiring Figure 6 Normally Closed Switch Wiring STEP 4 Slide the transmitter onto the back cover until locked into place to complete installation see Figure 7 CHECKOUT AND TEST After installation the transmitter and receiver should be checked out as a system Activate the transmitter by triggering the sensor Verify that the LED lights when the sensor is triggered except for D 26A Receiver activatio2. DESCRIPTION The D 21A K D 24A K and D 26A K are digitally coded stationary radio transmitters triggered by normally open N O or normally closed N C sensors These transmitters can be programmed to activate any of Linear s standard digital receivers that are tuned to the same frequency Each transmitter can perform many remote switching tasks and are typically used in wireless hardwire security systems Each unit is powered by a self contained 9 volt battery and can be connected to various sensors with the built in screw terminals NOTE Transmitters with a K model number suffix are Linear s Canadian models tuned to 318 MHz These instructions pertain to both the K and standard 303 875 MHz U S models D 21A N O TRANSMITTER The D 21A is used with various types of security sensors that are normally open magnetic contacts security floor mats etc The D 21A transmits a signal when the sensor circuit closes The transmitter triggers instantly and may be re triggered after a 30 second reset time A pushbutton is provided for batteryAransmission test Pressing the pushbutton with the sensor circuit open after the 30 second reset triggers the transmitter and turns on the red LED if the battery is above 7 5 volts D 24A N C TRANSMITTER The D 24A is used with various types of security sensors that are normally closed magnetic contacts security window screens etc The D 24A transmits a signal when the sensor circui
3. ly to wholesale customers who buy direct from Linear or through Linears normal distribution channels Linear does not warrant this product to consumers Consumers should inquire from their selling dealer as to the nature of the dealers warranty if any There are no obligations or liabilities on the part of Linear corporation for consequential damages arising out of or in connection with use or performance of this product or other indirect damages with respect to loss of property revenue or profit or cost of removal installation or reinstallation All implied warranties including implied warranties for merchantability and implied warranties for fitness are valid only until Warranty Expiration Date as labeled on the product This Linear Corporation Warranty is in lieu of all other warranties express or implied For warranty service on Linear equipment return product at sender s expense to U S A Canada Linear Corporation Linear Canada Inc 2350 Camino Vida Roble Suite A 673 Consortium Court Carlsbad CA 92009 London Ontario Canada N6E 2S8 Attn Repairs Department Attn Repairs Department IMPORTANT Linear radio controls provide a reliable communications link and fill an important need in portable wireless signalling However there are some limitations which must be observed For U S installations only The radios are required to comply with FCC Rules and Regulations as Part 15 devices As such they have limited transmi
4. n indicates that the transmitter is 0 Figure 7 x Typical 1 5 Installation H a Door and Window operating properly and that the transmitters digital code is correctly matched to the code set in the receiver CAUSES FOR NON OPERATION If the transmitter fails to activate the receiver first check the coding switches to see that the switch keys in the transmitter and the receiver are correctly matched Next check the battery and replace it if its weak If the code is set correctly the battery is good and the LED lights but the receiver dosen t activate check for hidden metal obstacles or large metal appliances between the transmitter and receiver that may be blocking the radio signal Re location of the transmitter or receiver may be necessary CAUTION The manufacturer strongly recommends that you test security equipment frequently From the time of installation it is absolutely necessary to test the system at least once a week Although the 9 volt battery should last about a year it is good practice to change the battery every six months LINEAR LIMITED WARRANTY This Linear product is warranted against defects in material and workmanship for twelve 12 months The Warranty Expiration Date is labeled on the product This warranty extends on
5. t opens The transmitter incorporates a time delay of 1 to 3 seconds ensuring that the sensor circuit must be continuously open for at least 1 second before the D 24A will transmit This feature helps prevent activation from short term spurious signals and from signals made from outside electromagnetic sources The transmitter may be re triggered after a 30 second reset time The transmitter has a pushbutton for battery transmission test NOTE On the D 24A the loop input terminals must be closed for a minimum of 45 seconds before the pushbutton will activate the transmitter D 26A N O TIME DELAY TRANSMITTER The D 26A is used with various types of security sensors that are normally open The special purpose D 26A transmitter has a built in exit entry time delay The timer starts when the sensor circuit closes It begins a 5 to 10 second countdown If no action is taken before the time delay is completed the transmitter will send an alarm signal to its companion receiver Pressing the pushbutton before the time delay period has elapsed will prevent signal transmission In addition to canceling time delayed signal transmission the pushbutton is used to test the battery Pressing the button turns on the red LED if the battery is in good condition The LED does not light upon transmission NOTE The each transmitter contains a timing circuit that allows a single transmission of a 2 second duration to occur followed by a 30 second rese
6. t time This means that regardless of the number of times the transmitter is triggered it willnot send a signal more often than once every 30 seconds CODE SWITCH LOCATION The digital coding switch is attached to the circuit board inside the case To access the switch unsnap and slide off the back cover as shown in Figure 1 exposing the battery lead wire screw terminals and digital coding switch see Figure 2 Figure 1 Removing the Transmitter Back Cover CODING SWITCH Figure 2 Transmitter Components CODE SETTING CAUTION All transmitters and receivers must be re coded by installer prior to operation DO NOT USE THE FACTORY SET CODE Among the 256 possible codes four codes are considered invalid and should not be used They are all keys ON all keys OFF and keys set alternating ON OFF or OFF ON combinations To set a code select any valid combination of ON and OFF positions for the switch keys numbered 1 through 8 Use a pointed object other than a pencil or pen to set the keys The ON position is when the top of the switch is down facing the numbers The OFF position is when the top of the switch is up and the bottom is down away from the numbers In the example shown in Figure 3 keys 1 4 6 and 8 are ON keys 2 3 5 and 7 are OFF MOUNTING RECESSED WIRING SURFACE WIRING SLOT Figure 3 Example Coding Switch INSTALLATION To mount the transmitter proceed as follows STEP 1
7. tter power and therefore limited range Receivers may be blocked by radio signals that occur on or near their operating frequencies regardless of code settings A receiver cannot respond to more than one transmitted signal at a time Infrequently used radio links should be tested regularly to protect against undetected interference or fault A general knowledge of radio and its vagaries should be gained prior to acting as a wholesale distributor or dealer and these facts should be communicated to the ultimate users Copyright 1992 Linear Corporation 200105 C D 21A D 21A K D 24A D 24A K D 26A D 26A K Digital Security Transmitters Code Setting and Installation Instructions Linear ANORTEK COMPANY
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