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                                                                    EXHIBIT 10.1
                                                            Agreement # G10530-1

                                   LONWORKS(R)
                              OEM LICENSE AGREEMENT


         This Agreement is entered into between ECHELON CORPORATION ("Echelon")
and Dayton General Systems ("Licensee") on the following terms and conditions:

1.       DEFINITIONS

         (a)      "LonTalk(R) Protocol" means Echelon's protocol for control
                  networks.

         (b)      "Neuron(R) Chips" means semiconductor devices designed or used
                  to implement all or part of the LonTalk Protocol that are
                  manufactured by Echelon or by a supplier licensed by Echelon
                  to manufacture or distribute such devices.

         (c)      "LonWorks Applications" means equipment that incorporates
                  Neuron Chips and the LonTalk Protocol. LonWorks Applications
                  shall exclude development systems for developing applications
                  that use the LONTALK Protocol.

         (d)      "Echelon Intellectual Property" means (i) U.S. Patent No.
                  4,918,690, U.S. Patent No. 4,941,143, U.S. Patent No.
                  4,955,018, U.S. Patent No. 4,969,147, U.S. Patent No.
                  5,319,641 and foreign patents based upon such U.S. patents and
                  claiming the same inventions, and (ii) Echelon copyrights
                  governing the LonTalk Protocol.

         (e)      "Neuron Chip Firmware" means only the Echelon software which,
                  among other things, implements the LonTalk Protocol, and which
                  is identified as "Neuron Chip Firmware" in the documentation
                  and/or start up screen for Echelon's development systems for
                  developing applications that use the LonTalk Protocol.

2.       LICENSE

         (a)      Echelon grants Licensee a nonexclusive, royalty-free, fully
                  paid license, under Echelon Intellectual Property, to make,
                  use and sell LONWORKS Applications. Licensee agrees that
                  whenever a Neuron Chip is executing instructions, the Neuron
                  Chip Firmware shall be loaded into it starting at address
                  location 0 (zero). Licensee's rights to use the LonTalk
                  Protocol and Neuron Chips shall not extend to use of the
                  LonTalk Protocol in devices that duplicate the functions of
                  all or part of the Neuron Chips, or to use the Neuron Chips
                  with any communications protocol other than the LonTalk
                  Protocol. The foregoing limitations shall apply to all Neuron
                  Chips incorporated by Licensee into its LonWorks Applications,
                  including Neuron Chips contained in products or equipment
                  purchased by Licensee.

         (b)      In the event that Licensee manufactures LonWorks Applications
                  in an incomplete form without the LonTalk Protocol, Licensee
                  may sell or otherwise distribute such LonWorks Applications
                  only to customers who have entered into a LonWorks Development
                  License Agreement or LonWorks OEM License Agreement with
                  Echelon or its subsidiaries that has an agreement number
                  preceded by the letter "E" or a subsequent letter of the
                  alphabet (an "OEM Licensee"). Licensee shall maintain records
                  of the names, addresses and Echelon License Agreement numbers
                  of its customers for such LonWorks Applications and shall,
                  within fifteen (15) days after the end of each calendar
                  quarter, provide Echelon with a report listing all of such
                  customers for the previous calendar quarter. If Echelon
                  notifies Licensee that any customer listed in such report is
                  not an OEM licensee, then Licensee shall promptly discontinue
                  selling such LonWorks Applications to such customer.

         (c)      Echelon grants Licensee a nonexclusive, royalty-free, fully
                  paid license to reproduce and distribute the Neuron Chip
                  Firmware without modification for use only with Neuron Chips;
                  provided that Neuron Chip Firmware is programmed into either:
                  (i) the memory of a Neuron Chip, or (ii) a memory device
                  attached to the memory bus of a Neuron Chip. Notwithstanding
                  the foregoing, Licensee may provide a master copy of the
                  Neuron Chip Firmware linked with an application program on
                  removable media to (A) an OEM Licensee who is a contract
                  manufacturer for Licensee's LonWorks Applications and (B) an
                  OEM Licensee for whom Licensee is designing LonWorks
                  Applications, for use and distribution by such OEM Licensee
                  pursuant to the terms of such OEM Licensee's agreement with
                  Echelon. Licensee agrees not to modify, translate, reverse
                  engineer, decompile, disassemble or otherwise attempt to
                  derive source code for the Neuron Chip Firmware (except to the
                  extent that such acts may not be prohibited under applicable
                  law).

         (d)      At the request of Licensee, and upon receipt of a fee of Fifty
                  United States Dollars (U.S. $50.00), Echelon will deliver to
                  Licensee one (1) copy of the Neuron Chip Firmware if Licensee
                  has not already received such a copy from Echelon.

         (e)      No license is granted, express or implied, under any patents,
                  trade secrets, know-how or other intellectual property of
                  Echelon covering specific applications or implementations of
                  the LonTalk Protocol, LonWorks Applications or Neuron Chips.
                  Licensee shall have no right under Echelon Intellectual
                  Property to modify the LonTalk Protocol.

         (f)      Licensee may make appropriate and truthful reference to
                  Echelon and Echelon products and technology in Licensee's
                  company and product literature, provided that Licensee
                  properly attributes Echelon's trademarks; and provided,
                  further, that Licensee does not use the name of Echelon or any
                  Echelon trademark in its name or its product name. No license
                  is granted, express or implied, under any Echelon trademarks,
                  trade names or service marks.


                   LonWorks OEM License Agreement           Page 1 of 3
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3.       USE OF NEURON CHIPS

         LICENSEE ASSUMES RESPONSIBILITY FOR, AND HEREBY AGREES TO USE ITS BEST
         EFFORTS IN, DESIGNING AND MANUFACTURING EQUIPMENT LICENSED HEREUNDER TO
         PROVIDE FOR SAFE OPERATION THEREOF, INCLUDING, BUT NOT LIMITED TO,
         COMPLIANCE OR QUALIFICATION WITH RESPECT TO ALL SAFETY LAWS,
         REGULATIONS AND AGENCY APPROVALS, AS APPLICABLE. THE NEURON CHIP,
         LONTALK PROTOCOL AND NEURON CHIP FIRMWARE ARE NOT DESIGNED OR INTENDED
         FOR USE AS COMPONENTS IN EQUIPMENT INTENDED FOR SURGICAL IMPLANT INTO
         THE BODY, OR OTHER APPLICATIONS INTENDED TO SUPPORT OR SUSTAIN LIFE,
         FOR USE IN FLIGHT CONTROL OR ENGINE CONTROL EQUIPMENT WITHIN AN
         AIRCRAFT, OR FOR ANY OTHER APPLICATION IN WHICH THE FAILURE OF THE
         NEURON CHIP, LONTALK PROTOCOL OR NEURON CHIP FIRMWARE COULD CREATE A
         SITUATION IN WHICH PERSONAL INJURY OR DEATH MAY OCCUR, AND LICENSEE
         SHALL HAVE NO RiGHTS HEREUNDER FOR ANY SUCH APPLICATIONS.

4.       INDEMNITY

         Echelon shall indemnify Licensee for any liabilities, damages and costs
         payable by Licensee to a third party in an action for infringement of
         any third party United States patent by the LonTalk Protocol and for
         reasonable attorney's fees relating thereto. The foregoing shall be
         subject to the Licensee notifying Echelon promptly in writing of and
         giving Echelon the exclusive authority to defend or settle any such
         claim or proceeding. If the use of the LonTalk Protocol is enjoined or
         is the subject of any actual or potential patent infringement action,
         Echelon may, at its option, procure for Licensee the right to continue
         to use the LonTalk Protocol or replace or modify the LonTalk Protocol
         so that it becomes noninfringing. Notwithstanding the foregoing,
         Echelon assumes no liability for any claims attributable to Licensee's
         specific applications for the LonTalk Protocol or attributable to the
         use of the LonTalk Protocol in combination with equipment or technology
         not provided by Echelon if the claim would not have occurred but for
         such specific application or combination. In addition, in no event
         shall Echelon's liability to Licensee under this paragraph exceed the
         amount of Two Thousand Five Hundred United States Dollars (U.S.
         $2,500,00.). THE FOREGOING STATES THE ENTIRE LIABILITY OF ECHELON WITH
         RESPECT TO INFRINGEMENT OF ANY PATENTS OR OTHER INTELLECTUAL PROPERTY
         RIGHT BY THE LONTALK PROTOCOL, LONWORKS APPLICATIONS, NEURON CHIP,
         ECHELON INTELLECTUAL PROPERTY OR NEURON CHIP FIRMWARE.

         WARRANTY AND DISCLAIMER

         Echelon represents and warrants that it has the right to grant the
         licenses granted herein. ECHELON DISCLAIMS ALL OTHER WARRANTIES AND
         CONDITIONS, EXPRESS, IMPLIED OR STATUTORY, RESPECTING THE LONTALK
         PROTOCOL, LONWORKS APPLICATIONS, NEURON CHIPS, ECHELON INTELLECTUAL
         PROPERTY OR NEURON CHIP FIRMWARE, INCLUDING BUT NOT LIMITED TO ANY
         IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR
         PURPOSE AND ANY IMPLIED WARRANTIES ARISING FROM COURSE OF PERFORMANCE,
         COURSE OF DEALING OR USAGE OF TRADE.

6.       TERMI(NATION) AND TERMINATION

         (a)      The term of this Agreement shall be ten (10) years from the
                  date of execution unless terminated earlier as provided below.
                  Licensee may renew this Agreement for an additional ten (10)
                  year period upon written notice delivered to Echelon within
                  the last six (6) months of the initial term, Echelon agrees to
                  give Licensee six (6) months notice prior to expiration of the
                  initial term of this Agreement. If Echelon fails to give such
                  notice, then this Agreement shall remain in force until six
                  (6) months after notice of expiration is given by Echelon (but
                  in no event longer than six (6) months after ten (10) years
                  from the date of execution) unless renewed prior to such date.

         (b)      In addition, the non-breaching party may terminate this
                  Agreement upon a breach by the other party if such breach
                  remains uncured thirty (30) days after delivery by the
                  non-breaching party of written notice of the breach. The
                  provisions of paragraphs 5, 7 and 8 shall survive any
                  termination of this Agreement. All other provisions shall
                  terminate.

7.       LIMITATION OF LIABILITY

         NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY LOST PROFITS OR
         OTHER SPECIAL CONSEQUENTIAL, INDIRECT, PUNITIVE OR INCIDENTAL DAMAGES,
         HOWEVER CAUSED ON ANY THEORY OF LIABILITY, ARISING IN ANY WAY OUT OF
         THIS AGREEMENT OR THE DEVELOPMENT OR DISTRIBUTION BY LICENSEE OF
         APPLICATIONS OR SYSTEMS USING THE LONTALK PROTOCOL, NEURON CHIPS OR
         NEURON CHIP FIRMWARE. THE FOREGOING SHALL NOT APPLY TO ANY BREACHES BY
         LICENSEE OF SECTIONS 2 OR 3.

8.       MISCELLANEOUS

         (a)      Licensee shall comply with any United States export controls
                  governing export of any technical data or technology provided
                  by Echelon. If Licensee is other than a U.S. entity or is
                  located outside the U.S., Licensee, as a prior condition to
                  exercising its rights hereunder, shall execute any letter of
                  written assurances required for the export of technical data
                  or technology by Echelon and shall comply with such other
                  requirements of the U.S. Department of Commerce or other
                  applicable agency for the export of technical data or
                  technology by Echelon and shall comply with such other
                  requirements of the U.S. Department of Commerce or other
                  applicable agency for the export of technical data or
                  technology by Echelon to Licensee.

         (b)      If Licensee is other than a U.S. entity or is located outside
                  of the U.S., Licensee represents that no consent or approval
                  of any governmental authority is required in connection with
                  the valid execution and performance of this Agreement.

         (c)      This Agreement will be governed by and construed in accordance
                  with the laws of the State of California, U.S.A., except that
                  body of California law concerning conflicts of law.


                   LonWorks OEM License Agreement                Page 2 of 3
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         (d)      Licensee shall not assign this Agreement or any of its rights
                  or duties hereunder except to a successor-in-interest without
                  the prior written consent of Echelon which shall not be
                  unreasonably withheld.

         (e)      Use, duplication or disclosure by the U.S. Government is
                  subject to restrictions as set forth in subdivision (c)(i)(ii)
                  of the Rights in Technical Data and Computer Software clause
                  at DFARS 2152.227-7013, the Commercial Computer Software
                  Restricted Rights clause at FAR 52.227-19, or other comparable
                  regulations of other government agencies, as applicable.

         (f)      Licensee agrees that Echelon may disclose its name, address
                  and Agreement number to vendors of Neuron Chips or LonWorks
                  Applications for the purpose of verifying Licensee's status as
                  an Echelon licensee.

         (g)      This Agreement constitutes the entire agreement between the
                  parties, and supersedes any prior agreements, with respect to
                  the subject matter hereof. No amendment to any term of the
                  Agreement shall be valId unless mutually agreed to in writing
                  by the parties. The failure of either party to enforce any
                  provision of this Agreement shall not constitute a waiver of
                  such provision.


ECHELON CORPORATION:                           LICENSEE: Dayton General Systems



Signature: 161 Oliver R. Stanfeld              Signature: 151 Thomas C. Haas

Print Name: Oliver R. Stanfield                Print Name: Thomas c. Hass

Title: Vice President                          Title: CEO

Effective Date: May 26, 1995                   Date Signed:  May 22, 1995

Address: 4015 Miranda Avenue                   Address: 2492 Technical Drive
Palo Alto, CA  94304                           Miamisburg, OH  45342
(800) 258-4LON
                                               Phone:  513-847-7800

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