DETECTION SYSTEMS INC
SC 13G, 1998-03-20
COMMUNICATIONS EQUIPMENT, NEC
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<PAGE>   1
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                  SCHEDULE 13G
                  Under the Securities Exchange Act of 1934




                            Detection Systems, Inc.
- ------------------------------------------------------------------------------
                               (Name of Issuer)

                                 Common Stock
- -----------------------------------------------------------------------------
                         (Title of Class of Securities)

                                  250644101
- -----------------------------------------------------------------------------
                               (CUSIP Number)

Check the following box if a fee is being paid with this statement /X/. (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).
       
*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities,
and for any subsequent amendment containing information which would alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act, but shall be subject to all other provisions of the Act (however, see
the Notes).



                               Page 1 of 4 pages
<PAGE>   2

CUSIP No. 250644101              SCHEDULE 13G                  Page 2 of 4 Pages



- --------------------------------------------------------------------------------
 1    NAME OF REPORTING PERSON
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

      
      Ultrak, Inc.
- --------------------------------------------------------------------------------
 2    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*       
      (See Instructions)                                     (a) /  /
                                                             (b) /  /
       N/A
- --------------------------------------------------------------------------------
 3    SEC USE ONLY



- --------------------------------------------------------------------------------
 4    CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware corporation, U.S.A.
- --------------------------------------------------------------------------------
                               5     SOLE VOTING POWER

          NUMBER OF            
                                     316,500
           SHARES              -------------------------------------------------
                               6     SHARED VOTING POWER
        BENEFICIALLY           
                               
          OWNED BY                   0
                               ------------------------------------------------
            EACH               7     SOLE DISPOSITIVE POWER
                    
          REPORTING 
                                     316,500
           PERSON              ------------------------------------------------
                               8     SHARED DISPOSITIVE POWER                  
            WITH    
                                     
        
- ------------------------------------------------------------------------------- 
 9    AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON


      316,500  
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES 


      N/A
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9


      5.0%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*


      CO
- --------------------------------------------------------------------------------


                     *SEE INSTRUCTION BEFORE FILLING OUT!


                              Page 2 of 4 pages
<PAGE>   3

                                 SCHEDULE 13G


    ITEM 1 (a).    NAME OF ISSUER:
                 
                   Detection Systems, Inc.
                   ------------------------------------------------------------

    ITEM 1 (b).    ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
                 
                   130 Perinton Parkway  Fairport, New York  14450
                   ------------------------------------------------------------
                 
    ITEM 2 (a).    NAME OF PERSON FILING:
                 
                   Ultrak, Inc.
                   ------------------------------------------------------------
                 
    ITEM 2 (b).    ADDRESS OF PRINCIPAL BUSINESS OFFICE:
                 
                   1301 Waters Ridge Drive
                   ------------------------------------------------------------
                 
    ITEM 2 (c).    CITIZENSHIP:

                   Delaware Corporation, U.S.A.
                   ------------------------------------------------------------
                 
    ITEM 2 (d).    TITLE OF CLASS OF SECURITIES:
                 
                   Common Stock
                   ------------------------------------------------------------
                 
    ITEM 2 (e).    CUSIP NUMBER:
                 
                   250644101
                   ------------------------------------------------------------
                   
                 
    ITEM 3         TYPE OF REPORTING PERSON:

                   CO
                   ------------------------------------------------------------
                 
    ITEM 4         OWNERSHIP.
                 
                   (a)    AMOUNT BENEFICIALLY OWNED:  316,500
                 
                   (b)    PERCENT OF CLASS:  5.0%
                 
                   (c)    NUMBER OF SHARES AS TO WHICH SUCH PERSON HAS: 316,500
                 
                 
                 
                 
                              Page 3 of 4 Pages

<PAGE>   4

ITEM 5.            OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

                   Ultrak, Inc.   5.0%  
                   -------------------------------------------------------------
                 
ITEM 6.            OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER
                   PERSON:

                   N/A
                   -------------------------------------------------------------
                 
ITEM 7.            IDENTIFICATION AND CLASSIFICATION OF SUBSIDIARIES WHICH 
                   ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT 
                   HOLDING COMPANY:
                 
                   N/A
                   -------------------------------------------------------------
                 
ITEM 8.            IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:
                 
                   N/A
                   -------------------------------------------------------------

ITEM 9.            NOTICE OF DISSOLUTION OF GROUP:
                 
                   N/A
                   -------------------------------------------------------------
                 
ITEM 10.           CERTIFICATION:
                 
                   By signing below I certify that, to the best of my knowledge
                   and belief, the securities referred to above were acquired 
                   in the ordinary course of business and were not acquired for
                   the purpose of and do not have the effect of changing or 
                   influencing the control of the issuer of such securities and
                   were not acquired in connection or as a participant in any 
                   transaction having such purpose or effect.
                   -------------------------------------------------------------
                 
                                  SIGNATURE


     After reasonable inquiry and to the best of my knowledge and belief, I 
certify that the information set forth in this statement is true, complete and
correct.
                 
                 
                 
DATED:                 
      ---------------------                 
                 
                 
                                          By:  /s/
                                               ------------------------
                 



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