5.2.1.2 Serial number (see 3.2).
MIL-STD-130N
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a. For item non-UID MRI marks, the applicable serial number shall be encoded in accordance with the applicable MRI protocol requirements using any of the applicable MRI protocol data qualifiers for that protocol, to include those specified for use in Table VI.
b. For IUID marks, if the serial number used to derive the UII is other than any serial number marked on the item (see 3.31.1 item mark definition), encode the UII data set as a single element and do not mark the serial number used to derive the UII as a discrete element in HRI or MRI on the item. See Table VI for UII data set (single element) data qualifiers and Figure 2 example.
(1) The UII data set serial number element for UII Constructs #1 or #2 shall be encoded using the applicable MRI protocol data qualifiers in Table VI, except if the UII data set is encoded as a single element on the item. In which case, the UII data set serial number element need only be encoded as a discrete element if specified by the contract (subject to the restriction in 5.2.1.2.b.).
(2) If an item has a serial number assigned for tracking under a UIT program or in support of DoD supply policy for serialized item management in addition to a UII, the serial number should be encoded as MRI. If the serial number is not encoded as MRI, it shall be marked as HRI.
5.2.1.3 Part or identifying number (PIN - see 3.2) or unique lot / batch number.
a. Each item's MRI marking shall include the PIN encoded in accordance with the applicable MRI protocol requirements (see 5.2.2) using one of the applicable MRI protocol data qualifiers, to include those in Table VI (see 5.2.1.3.b for DPM exception and 5.2.1.5 for legacy item exception).
NOTE: For item non-UID marks, UII Construct #1 marked items, or DoD recognized IUID equivalent marked items, the data qualifiers for either "original" or "current" data elements in Table VI may be used according to the applicable MRI protocol business rules.
NOTE: For ordnance items, the PIN may be the item's NSN for some applications.
b. For DPM applications, where PIN roll is likely, the PIN may be marked as HRI only. NOTE: Deleted.
c. For IUID marks serialized within the PIN, lot or batch number (UII Construct #2), the original PIN, lot or batch number, as applicable, shall be encoded in accordance with the applicable MRI protocol requirements (see 5.2.2) using the applicable MRI protocol data qualifiers in Table VI.
NOTE: To avoid ambiguity in a UII Construct #2 mark with a mix of original PIN, lot, or batch data qualifiers, encode the UII data set as a single element (see Table VI).
d. When the PIN rolls/changes, the new current PIN should be marked on the item in accordance with the applicable MRI protocol requirements (see 5.2.2) using the applicable MRI protocol data qualifiers in Table VI. The new current PIN may be encoded in a single Data Matrix symbol along with the UII data set elements at the discretion of the MRI protocol used. For UII Construct #2 applications, the original PIN, original lot number, or original batch number shall continue to be clearly identified and encoded in the MRI. When the PIN is changed, the source enterprise (manufacturer or supplier) EID that assigned the PIN should also
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