Programming Guide

ISO 18000 Data Elements

Sub-Unique Identifier (SUID)

Within the ISO 18000-6A protocol, only part of the 64-bit Unique

Identifier (UID) is used. Referrred to as the Sub-Unique Identifier

(SUID), this 40-bit code is transmitted in most tag commands and

in tag replies during collision arbitraton. The SUID is made up of

an 8-bit manufacturer code followed by the 32 LSBs of the

manufacturer serial number.

NOTE:

The manufacturer serial number in the 64-bit UID is typically

48 bits. However, the 16 MSBs (33-48) are set to 0.

Figure 16 shows the mapping of the 64-bit UID to the 40-Bit

SUID and back to the UID.

Figure 16 - Sub-Unique Identifier Mapping