Occasionally the SSPC receives requests for official interpretations of Standards 135 and 135.1. An "Interpretation" is "The written explanation of the meaning of specific provisions of a standard or guideline, as determined by the IC [Interpretations Committee] or the PC [Project Committee, i.e., SSPC 135] in response to an inquiry." The following PDF files contain all such interpretations to date:
Interpretation 135-2001-1 - June 26, 2004 (Refers to the requirements presented in ANSI/ASHRAE Addendum b to ANSI/ASHRAE Standard 135-2001, Section 15.8 ReadRange Service.)
Interpretation 135-2004-1 - June 26, 2004 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 16.1 DeviceCommunicationControl Service, specifically Section 16.1.2 (page 326), relating to the canceling of DeviceCommunicationControl disabling of communication via a ReinitializeDevice request.)
Interpretation 135-2004-2 - June 26, 2004 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 13.11 GetEnrollmentSummary Service, specifically Section 13.11.1.2.1.4 (page 283), relating to the priority returned in a GetEnrollmentSummary response.)
Interpretation 135-2004-3 - June 26, 2004 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 12.25.5, Log_Enable, and Section 12.25.12, Stop_When_Full.)
Interpretation 135-2004-4 - June 26, 2004 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Sections 12.25.14, Log_Buffer, 12.25, and 15.7.2, Service Procedure.)
Interpretation 135-2004-5 - June 26, 2004 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 12.25.5, Log_Enable, and Section 12.25.12, Stop_When_Full.)
Interpretation 135-2004-6 - February 5, 2005 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 12.24.8, Exception_Schedule.)
Interpretation 135-2004-7 - February 5, 2005 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Sections K.5.15 and K.5.16.)
Interpretation 135-2004-8 - June 25, 2005 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004 in the following sections and tables relating to FLOATING_LIMIT and OUT_OF_RANGE transitions: Sections 12.2.19-12.2.21, Sections 12.3.20-12.3.22, Sections 12.4.16-12.4.18, Section 12.17.32, Sections 12.23.22-12.23.24, Section 13.3.5, Section 13.3.6, Table 13.2.)
Interpretation 135-2004-9 - June 25, 2005 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Sections 12.1-12.4, 12.6-12.8, 12.15-12.20, 12.23, 12.25, and the corresponding tables in these sections, relating to intrinsic reporting.)
Interpretation 135-2004-10 - June 25, 2005 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 6.6.1, Routing Tables, and Section 6.6.3.6, Router- Busy-To-Network.)
Interpretation 135-2004-11 - June 25, 2005 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 12.25.14, Log_Buffer, and Section 15.7.3.1.2, List of Property References.)
Interpretation 135-2004-12 - June 25, 2005 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 6.4.4, Reject-Message-To-Network, and Section 6.6.3.5, Reject-Message-To-Network.)
Interpretation 135-2004-13 - June 25, 2005 (Refers refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Sections 12.1.10, 12.2.10, 12.3.10, 12.4.9, 12.6.10, 12.7.10, 12.8.9, 12.15.11, 12.16.11, 12.17.9, 12.18.10, 12.19.10, 12.20.9, 12.23.10, relating to the Reliability and Out_Of_Service properties.)
Interpretation 135-2004-14 - September 28, 2005 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 6.3.2, relating to Network Layer routing.)
Interpretation 135-2004-15 - September 28, 2005 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Annex J - BACnet/IP, specifically Section J.2.6.1, Register-Foreign-Device: Format.)
Interpretation 135-2004-16 - June 24, 2006 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Sections 12.1.8, 12.2.8, 12.3.8, 12.4.7, 12.6.8, 12.7.8, 12.8.7, 12.17.7, 12.18.8, 12.20.7, and 12.23.8 related to Event_State and Relibility properties.)
Interpretation 135-2004-17 - April 24, 2006 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 12.25.14, related to Log_Buffer.)
Interpretation 135-2004-18 - January 21, 2006 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 12.25.9, related to Log_Interval.)
Interpretation 135-2004-18 - January 21, 2006 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 12.25.9, related to Log_Interval.)
Interpretation 135-2004-19 - January 27, 2007 (Refers to the requirements presented in
ANSI/ASHRAE Standard 135-2004, Sections.15.9.1.1.5, 15.10.3.2.4 and 19.2.1, related to writing properties with an out-of-range priority.)
Interpretation 135-2004-20 - January 27, 2007 (Refers to the requirements presented in
ANSI/ASHRAE Standard 135-2004, Sections 5.4, 5.4.1, 5.4.5.1, 5.4.5.3, and 12.11.27 related to the Device Object and the APDU_Timeout property.)
Interpretation 135-2004-21 - January 27, 2007 (Refers to the requirements presented in
ANSI/ASHRAE Standard 135-2004, Section 12.24.4, 12.24.7 and 12.24.8 regarding when the Present_Value of an object is evaluated within a selected Weekly_Schedule or
Exception_Schedule.)
Interpretation 135-2004-22 - April 25, 2007 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Sections 6.5.3 and 9.5.6.4 regarding the methods for establishing the address of a BACnet router for a particular DNET.)
Interpretation 135-2004-23 - June 21, 2008 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 13.2 relating to intrinsic reporting.)
Interpretation 135-2004-24 - June 21, 2008 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Sections 19.2, 21 and 23.3, and Addendum f to ANSI/ASHRAE Standard 135-2004 regarding ENUMERATED values in BACnetPriorityValue.)
Interpretation 135-2004-25 - June 21, 2008 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Sections 13.2 and 13.3 relating to fault event reporting.)
Interpretation 135-2004-26 - September 17, 2008 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 13.11.1.1.5 regarding Priority Filter.)
Interpretation 135-2004-27 - September 17, 2008 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 21 relating to BACnetEventParameters 'buffer-ready' choice.)
Interpretation 135-2004-28 - September 17, 2008 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Sections 15.10.1.3.1 and 18.8.4 relating to WritePropertyMultiple with incorrect datatype.)
Interpretation 135-2004-29 - January 24, 2009 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2004, Section 19.1.3.2, relating to creating configuration File objects in the restore process.)
Interpretation 135-2008-1 - June 20, 2009 (Refers to the requirements presented in
ANSI/ASHRAE Standard 135-2008, Sections 12.19.10 and 12.20.10, relating to Shrinking Number_of_States in Commandable Multi-state objects.)
Interpretation 135-2008-2 - June 20, 2009 (Refers to the requirements presented in
ANSI/ASHRAE Standard 135-2008, Section 12.24.4, related to the calculation of the Present_Value property of a Schedule object.)
Interpretation 135-2008-3 - January 23, 2010 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2008, Section 12, relating to the data type of the number of elements of an array when accessing an array property with array index 0.)
Interpretation 135-2008-4 - January 23, 2010 (Refers to the requirements presented in ANSI/ASHRAE Standard 135-2008, Section 12.13.7, File Object Modification_Date property value.)
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