=============================================================================== SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 2 to Statement on SCHEDULE 13D Under the Securities Exchange Act of 1934 CYLINK CORPORATION (Name of Subject Company) Common Stock, $.01 par value (Title of Class of Securities) 232565 10 1 (CUSIP Number of Class of Securities) Peter M. Kreindler, Esq. Senior Vice President and General Counsel Honeywell International Inc. 101 Columbia Road Morris Township, New Jersey 07962 Telephone: (973) 455-2000 (Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications) September 17, 2001 Date of Event which Requires Filing of This Statement ===============================================================================

SCHEDULE 13D CUSIP No. 232565 10 1 1. NAME OF REPORTING PERSONS S.S. OR I.R.S IDENTIFICATION NO. OF ABOVE PERSON Pittway Corporation IRS Identification No.: 13-5616408 ------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ X ] (b) [ ] ------------------------------------------------------------------------------- 3. SEC USE ONLY ------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC ------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) [ ] ------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ------------------------------------------------------------------------------- 7. NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH SOLE VOTING 0 ------------------------------------------------------------------------------- 8. NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH SHARED VOTING POWER 0 ------------------------------------------------------------------------------- 9. SOLE DISPOSITIVE POWER 0 ------------------------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 0 ------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0 ------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] ------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0% ------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON CO ------------------------------------------------------------------------------- 2

SCHEDULE 13D CUSIP No. 232565 10 1 1. NAME OF REPORTING PERSONS S.S. OR I.R.S IDENTIFICATION NO. OF ABOVE PERSON Honeywell International Inc. IRS No.: 22-2640650 ------------------------------------------------------------------------------- 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) [ X ] (b) [ ] ------------------------------------------------------------------------------- 3. SEC USE ONLY ------------------------------------------------------------------------------- 4. SOURCE OF FUNDS WC ------------------------------------------------------------------------------- 5. CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) [ ] ------------------------------------------------------------------------------- 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware ------------------------------------------------------------------------------- 7. NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH SOLE VOTING POWER 0 ------------------------------------------------------------------------------- 8. NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH SHARED VOTING POWER ------------------------------------------------------------------------------- 9. SOLE DISPOSITIVE POWER 0 ------------------------------------------------------------------------------- 10. SHARED DISPOSITIVE POWER 0 ------------------------------------------------------------------------------- 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 0 ------------------------------------------------------------------------------- 12. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] ------------------------------------------------------------------------------- 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 0% ------------------------------------------------------------------------------- 14. TYPE OF REPORTING PERSON CO ------------------------------------------------------------------------------- 3

On February 23, 1996, Pittway Corporation ("Pittway") filed a statement on Schedule 13D reporting beneficial ownership of shares of Common Stock, $.01 par value (the "Common Stock"), of Cylink Corporation ("Cylink"). Pursuant to a tender offer and a subsequent merger between Pittway and a wholly owned subsidiary of Honeywell International Inc. ("Honeywell"), which was consummated on February 14, 2000, Pittway became a direct wholly owned subsidiary of Honeywell. On June 26, 2001, Pittway and Honeywell filed an amendment to the Schedule 13D to report a change in investment intent. The Schedule 13D as amended is hereby amended as set forth below to reflect the disposition of Cylink common stock by Pittway in a private transaction. Item 5. Interest in Securities of the Issuer Item 5 is hereby amended to add the following: On September 17, 2001, Pittway sold all 8,606,085 shares of Cylink Common Stock that it held in a privately negotiated transaction. Thereafter, neither Pittway nor Honeywell beneficially owns any Cylink Common Stock. The shares were sold to Topspin Partners, L.P. and Topspin Associates, L.P. at a price of $0.35 per share, of which $0.30 per share was paid in cash and $.05 per share was paid in the form of a two-year note, the payment of which is subject to certain contingencies. The transaction was effected by physical delivery of the Cylink Common Stock certificate to the purchasers. 4

SIGNATURES After due inquiry and to the best of my knowledge and belief, the undersigned certifies that the information set forth in this statement is true, complete and correct. Dated: September 25, 2001 HONEYWELL INTERNATIONAL INC. BY: /s/ Richard F. Wallman ---------------------------------- Name: Richard F. Wallman Title: Senior Vice President and Chief Financial Officer PITTWAY CORPORATION BY: /s/ James V. Gelly ---------------------------------- Name: James V. Gelly Title: Vice President and Treasurer 5