<PAGE>
                              SECOND AMENDMENT TO
                          REVOLVING CREDIT AGREEMENT
                                       
     This Second Amendment to the Revolving Credit Agreement (the "Amendment")
is made as of October 6, 1997, by and among Eltrax Systems, Inc., a Minnesota
Corporation ("Eltrax") having its principal place of business at 2000 Town
Center, Suite 690, Southfield, Michigan 48075,  each of the wholly owned
subsidiaries of Eltrax, as their names appear on the signature page of this
Amendment (individually a "Borrower" and collectively, the "Borrowers") and
State Street Bank and Trust Company (the "Bank"), a Massachusetts Trust Company
with its principal offices at 225 Franklin Street, Boston, Massachusetts 02110.

     WHEREAS, the Borrowers and the Bank have previously executed a Revolving
Credit Agreement dated as of October 31, 1996, as amended (the "Credit
Agreement"); and

     WHEREAS, the Borrower and the Bank executed a First Amendment to Revolving
Credit Agreement on August 14, 1997, which increased the Revolving Line of
Credit to $5,500,000; and

     WHEREAS, the Borrowers desire that the Bank increase the Revolving Line of
Credit by an additional $2,500,000, to a total of $8,000,000, and make certain
other modifications, and the Bank is willing to make available to the Borrowers
this increase in the Revolving Line of Credit along with the requested
modifications, on the terms and conditions set forth therein.

     NOW THEREFORE,  the Borrowers, jointly and severally, and the Bank hereby
agree as follows:

     1.  Section 1(a) of the Credit Agreement, which defines the phrase 
COMMITMENT AMOUNT, is deleted in its entirety and substituted with the 
following:
          
               "COMMITMENT AMOUNT :  $8,000,000"
          
     2. Section 1(a) of the Original Agreement, which defines the phrase 
BORROWING BASE, is deleted in its entirety and substituted with the following:

             "BORROWING BASE:  An amount equal to the sum of
             eighty (80%) percent of the Eligible Accounts plus
             the lesser of (a) $2,000,000 and (b) thirty (30%)
             percent of the Eligible Inventory."

     3. Section 1(a) of the Credit Agreement, which defines the phrase 
MATURITY DATE, is deleted in its entirety, and substituted with the following:

             "MATURITY DATE:  October 31, 1999."
             

<PAGE>

     4. Section 2(a)(iii) of the Credit Agreement is hereby amended by 
deleting the first sentence thereof and inserting the following:

             "The Revolving Credit Loan shall be evidenced by
             an Amended and Restated Commercial Promissory
             Note in the original principal amount of
             $8,000,000 in substantially the form of EXHIBIT I
             hereto (the "Revolving Credit Note"), dated as of
             the date of the Second Amendment to the Credit
             Agreement, and completed with appropriate
             insertions, which Revolving Credit Note shall be
             due and payable in full on the Maturity Date."
             
     5. Section 2(d), Paragraph (i) of the Credit Agreement is deleted in its 
entirety and substituted with the following:

             "COMMITMENT FEE.  At all times prior to
             termination of the Commitment, the Borrowers
             shall pay to the Bank, a Commitment Fee of one-
             fourth of one percent (1/4%) per annum of the
             difference between the amount of the Commitment
             Amount and the sum of the daily average
             principal amount of the Revolving Credit Loans
             outstanding from time to time.  The Commitment
             Fee shall be calculated on the last day of each
             calendar quarter and on any other date the
             Commitment is terminated. The Commitment Fee
             shall be due and payable on the last day of each
             quarter."
             
     6. Section 6(s) of the Credit Agreement, FINANCIAL COVENANTS, is deleted 
in its entirety, and substituted with the following:

          "Financial Covenants.  The Borrowers shall comply with
          the following Financial Covenants, measured on a
          consolidated basis:

                    (i)  MINIMUM CURRENT RATIO.  On and prior to
               December 31, 1997, the Borrowers shall not permit
               the ratio of their Current Assets to Current
               Liabilities to be less than 1.00:1.00 at any
               time.  Beginning January 1, 1998, the ratio of
               Current Assets to Current Liabilities shall not
               be less than 1.1 to 1.0 at any time, and
               commencing January 1, 1999, the ratio of Current
               Assets to 


                                       2

<PAGE>

               Current Liabilities shall not be less than 1.5 to 
               1.0 at any time.
                    
                    (ii)  MAXIMUM INDEBTEDNESS TO NET WORTH.  On
               and prior to December 31, 1997, the Borrowers
               shall not permit the ratio of their Indebtedness
               to Net Worth to be greater than 1.5:1.0 at any
               time.  Beginning January 1, 1998, the ratio of
               Indebtedness to Net Worth shall not be greater
               than 1.3 to 1.0 at any time, and commencing
               January 1, 1999, the ratio of Indebtedness to Net
               Worth shall not be greater than 1.2 to 1.0 at any
               time.
                    
                    (iii) POSITIVE EBITDA.  For the quarter
               ending December 31, 1997, the Borrowers'
               consolidated EBITDA shall be positive, and for
               any individual month in such quarter, shall not
               be a loss of more than $100,000.  For the months
               ending January 31, 1998 and February 28, 1998,
               the Borrowers' consolidated EBITDA for the three
               month period ending with such month shall be
               positive.  Commencing with the month ending March
               31, 1998, and at the end of each subsequent
               month, the Borrowers' consolidated EBITDA for the
               three month period ending with such month shall
               not be less than $350,000.
                    
                    (iv) MAXIMUM CAPITAL EXPENDITURE.  The
               Borrowers shall not permit their Capital
               Expenditures to exceed $750,000 during the year
               ending December 31, 1997, and $500,000 for any
               subsequent fiscal year."


                                       3

<PAGE>

     7. CHANGES OF NAME, MERGERS, ETC.  None of the Borrowers shall merge 
with or into any Person, including any of the Borrowers, change its name or 
change its principal place of business without giving the bank at least 15 
days prior written notice thereof, and executing and delivering to the bank 
such Uniform Commercial Code Financing Statements, Landlord's Waivers and any 
other documents the Bank may reasonably request in order to more fully 
evidence and document the Bank's continuing security interest in the 
Collateral of any such Borrower, after giving effect to any such name change, 
merger or other transaction.

     8. CLOSING FEE.  Simultaneous with the execution and delivery of this 
Amendment, the Borrowers will pay to the Bank a Closing Fee of $30,000.

     9. REPRESENTATIONS AND WARRANTIES.  Each of the Borrowers jointly and 
severally represents and warrants to the Bank as follows:

     (a)  REPRESENTATIONS AND WARRANTIES.  The representations and warranties 
contained in Section 4 of the Credit Agreement and in each Instrument of 
Adherence  (Credit Agreement) executed and delivered by one or more of the 
Borrowers to the Bank (the "Instrument of Adherence"), were true and correct 
in all material respects when made.  Except to the extent that such 
representations and warranties expressly relate to a specific date or were 
based on facts which have changed in the ordinary course of business, which 
changes either singly or in the aggregate, have not been materially adverse, 
the representations and warranties contained in Section 4 of the Credit 
Agreement and the Instruments of Adherence, after giving effect to this 
Amendment, are true and correct on the date hereof.
     
     (b)  ENFORCEABILITY.  The execution and delivery by each of the 
Borrowers of this Amendment, and the performance by each of the Borrowers of 
the Amendment and the Credit Agreement, as amended hereby, are within the 
corporate authority of such Person and have been duly authorized by all 
necessary corporate proceedings. This Amendment and the Credit Agreement, as 
amended hereby, are valid and legally binding obligations of each of the 
Borrowers, enforceable in accordance with their terms, except as limited by 
bankruptcy, insolvency, reorganization, moratorium or similar laws relating 
to the enforcement of creditors' rights in general.
     
     (c)  NO DEFAULT.  Except as set forth in the Compliance Certificate 
attached hereto, no Default or Event of Default has occurred and is 
continuing, and no Default or Event of Default will exist after the execution 
and delivery of this Amendment.
     
     (d)  OTHER AGREEMENT.  The execution and delivery by each of the 
Borrowers of this Amendment, and the performance by each of the Borrowers of 
this Amendment and the Credit Agreement, as amended hereby, will not conflict 
with, or result in a breach of any term, condition or provision of, or 
constitute a default under, such Borrower's charter or by-laws as presently 
in effect or any other agreement, trust, deed, indenture, mortgage or other 
instrument to which such Person is a party or by which such Person or any of 
the property of such Person is bound or affected.

                                       4

<PAGE>

     10. AFFIRMATION OF THE BORROWERS.  Each of the Borrowers hereby affirms 
its absolute and unconditional, joint and several promise to pay to the Bank 
the Loans and all other amounts due under the Credit Agreement on the 
Maturity Date provided in the Credit Agreement, as amended hereby.

     11. WAIVER OF DEFAULT.  The Bank waives any and all Events of Default 
under the Agreement which have occurred for any period on or prior to August 
31, 1997.

     12. EFFECTIVENESS.  The effectiveness of this Amendment shall be 
conditioned upon receipt by the Bank of this Amendment, executed by each of 
the Borrowers and the Bank.  Execution of this Amendment by the Bank does not 
constitute a waiver by the Bank of any defaults, notices of default or rights 
of the Bank under the Credit Agreement, as amended hereby, all of which are 
unaffected hereby and remain in full force and effect.

     13. MISCELLANEOUS PROVISIONS.

     (a)  Except as otherwise expressly provided by this Amendment, all of 
the terms, conditions and provisions of the Credit Agreement shall remain the 
same.  It is declared and agreed by each of the parties hereto that the 
Credit Agreement, as amended hereby, is and shall continue in full force and 
effect, and that this Amendment and such Credit Agreement shall be read and 
construed as one instrument.
     
     (b)  This Amendment is intended to take effect as an agreement under 
seal and shall be construed according to and governed by the laws of the 
Commonwealth of Massachusetts.
     
     (c)  This Amendment may be executed in any number of counterparts, but 
all such counterparts shall together constitute but one instrument. In making 
proof of this Amendment it shall not be necessary to produce or account for 
more than one counterpart signed by each party hereto by and against which 
enforcement is sought.
          
     (d)  Each of the Borrowers hereby jointly and severally agrees to pay to 
the Bank, on demand by the Bank, all reasonable out-of-pocket costs and 
expenses incurred or sustained by the Bank in connection with the preparation 
of this Amendment and the documents referred to herein (including reasonable 
legal fees).

                                       5

<PAGE>

     IN WITNESS WHEREOF, the undersigned have duly executed this Amendment as a
sealed instrument as of the date first above written.

                                        ELTRAX SYSTEMS, INC.
                                        
                                        
                                        By: /s/ Nicholas J. Pyett
                                           ----------------------------
                                             Nicholas J. Pyett
                                        Its: Treasurer
                                        
                                        NORDATA, INC. (D/B/A DATATECH)
                                        
                                        
                                        By: /s/ Nicholas J. Pyett
                                           -----------------------------
                                             Nicholas J. Pyett
                                        Its: Treasurer
                                        
                                        ATLANTIC NETWORK SYSTEMS, INC.
                                        
                                        
                                        By: /s/ Nicholas J. Pyett
                                           -----------------------------
                                             Nicholas J. Pyett
                                        Its: Treasurer
                                        
                                        EJG TECHLINE INCORPORATED
                                        
                                        
                                        By: /s/ Nicholas J. Pyett
                                           -----------------------------
                                             Nicholas J. Pyett
                                        Its: Treasurer
                                        
                                        FOUR CORNERS TECHNOLOGY, INC.
                                        
                                        
                                        By: /s/ Nicholas J. Pyett
                                           -----------------------------
                                             Nicholas J.Pyett
                                        Its: Treasurer
                                        


                                       6

<PAGE>
                                        HI-TECH CONNECTIONS, INC.
                                        
                                        
                                        By: /s/ Nicholas J. Pyett
                                           -----------------------------
                                            Nicholas J. Pyett
                                        Its: Treasurer
                                        
                                        STATE STREET BANK AND TRUST COMPANY
                                        
                                        By: /s/ Frederic Epstein
                                           -----------------------------
                                            Frederic Epstein
                                        Its: Vice President
                                        


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