POWER OF ATTORNEY
       I, Christopher D. Heim, hereby authorize and designate each of David H.
 Sampsell, Amy C. Seidel, Joshua L. Colburn and Amra Hoso signing singly, as my
 true and lawful attorney-in-fact to:
              (1)	execute for and on my behalf, in my capacity as an officer
 and/or director of Digi International Inc. (the "Company"), Form ID and Forms
 3, 4 and 5 in accordance with Section 16(a) of the Securities Exchange Act of
 1934 (the "Exchange Act") and the rules and regulations promulgated
 thereunder; and other forms or reports on my behalf as may be required to file
 in connection with my ownership, acquisition, or disposition of securities of
 the Company, including Form 144;
              (2)	do and perform any and all acts for and on my behalf which
 may be necessary or desirable to complete and execute any such Form 3, 4 or 5,
 or other form or report, including Form ID, complete and execute any amendment
 or amendments thereto and timely file such form with the Securities and
 Exchange Commission, any stock exchange or similar authority, and the National
 Association of Securities Dealers; and
              (3)	take any other action of any type whatsoever in connection
 with the foregoing which, in the opinion of such attorney-in-fact, may be to
 my benefit, in my best interest, or legally required of me, it being
 understood that the statements executed by such attorney-in-fact on my behalf
 pursuant to this Power of Attorney shall be in such form and shall contain
 such terms and conditions as such attorney-in-fact may approve in such
 attorney-in-fact's discretion.
       I hereby further grant to each such attorney-in-fact full power and
 authority to do and perform any and every act and thing whatsoever requisite,
 necessary, or proper to be done in the exercise of any of the rights and
 powers herein granted, as fully to all intents and purposes as I might or
 could do if personally present, with full power of substitutes or revocation,
 hereby ratifying and confirming all that such attorney-in-fact, or such
 attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
 done by virtue of this Power of Attorney and the rights and powers herein
 granted.  I hereby acknowledge that the foregoing attorneys-in-fact, in
 serving in such capacity at my request, are not assuming, nor is the Company
 assuming, any of my responsibilities to comply with Section 16 of the Exchange
 Act.
       This Power of Attorney shall remain in full force and effect until I am
 no longer required to file Forms 3, 4 and 5 with respect to my holdings of and
 transactions in securities issued by the Company, unless earlier revoked by me
 in a signed writing delivered to the foregoing attorneys-in-fact.
  Notwithstanding the foregoing, if any such attorney-in-fact hereafter ceases
 to be at least one of the following: (i) an employee of the Company, (ii) a
 partner of Faegre Baker Daniels LLP, or (iii) an employee of Faegre Baker
 Daniels LLP, then this Power of Attorney shall be automatically revoked solely
 as to such individual, immediately upon such cessation, without any further
 action on my part.
       I hereby revoke all previous Powers of Attorney that have been granted by
 me in connection with my reporting obligations under Section 16 of the
 Exchange Act with respect to my holdings of and transactions in securities
 issued by the Company.
       IN WITNESS WHEREOF, I have caused this Power of Attorney to be duly
 executed as of this 30th day of January, 2018.

/s/ Christopher D. Heim