GS1 EPC Tag Data Standard 1.6 - Indicod-Ecr

Bit Pattern Description Additional Info See Section0000 0111 Directory pointer Followed by EBV-8 pattern I.4.40000 11xx ID Map Packed Object I.4.20000 00010000 00100000 0011[Invalid]Invalid pattern41104111411241134114411541164117411841194120412141224123412441254126412741284129413041314132413341344135413641374138413941404141I.4.1 Data Terminating Flag PatternA pattern of eight or more ‘0’ bits at the expected start of a Packed Object denotes that nomore Packed Objects are present in the remainder of memory.NOTE: Six successive ‘0’ bits at the expect start of a Packed Object would (if interpretedas a Packed Object) indicate an ID List Packed Object of length zero.I.4.2 Format Flag section starting bit patternsA non-zero EBV-6 with a leading pattern of “0000” is used as a Format Flags sectionIndication Pattern. The additional bits following an initial ‘0000’ format Flag IndicatingPattern are defined as follows: A following two-bit pattern of ‘10’ (creating an initial pattern of ‘000010’) indicatesan IDLPO with at least one non-default optional feature (see I.4.3) A following two-bit pattern of ‘11’ indicates an IDMPO, which is a Packed Objectusing an ID Map format instead of ID List-format The ID Map section (see I.9)immediately follows this two-bit pattern. A following two-bit pattern of ‘01’ signifies an External pattern (Padding pattern orPointer) prior to the start of the next Packed Object (see I.4.4)A leading EBV-6 Object Length of less than four is invalid as a Packed Objects length.NOTE: the shortest possible Packed Object is an IDLPO, for a data system usingfour bits per ID Value, encoding a single ID Value. This Packed Object has atotal of 14 fixed bits. Therefore, a two-octet Packed Object would only containtwo data bits, and is invalid. A three-octet Packed Object would be able toencode a single data item up to three digits long. In order to preserve “3” as aninvalid length in this scenario, the Packed Objects encoder shall encode a leadingFormat Flags section (with all options set to zero, if desired) in order to increasethe object length to four.I.4.3 IDLPO Format FlagsThe appearance of ‘000010’ at the expected start of a Packed Object is followed by twoadditional bits, to form a complete IDLPO Format Flags section of “000010NA”, where: If the first additional bit ‘N’ is ‘1’, then a non-default format is employed for theIDLPO Object Info section. Whereas the default IDLPO format allows for only asingle ID List (utilizing the registration’s default Base ID Table), the optional non-Copyright ©2005- 2011 GS1 AISBL, All Rights Reserved. Page 168 of 218