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ISO/IEC 18000-6:2004(E)

Table 112 — GROUP_SELECT_LT command

8.2.7.7.8 GROUP_UNSELECT_EQ

Command code = ‘04’

On receiving a GROUP_UNSELECT_EQ command, as shown in Table 114, a tag that is in the ID state shall read the 8-byte memory content beginning at the specified address and compare it with the WORD_DATA sent by the interrogator. In the case that the memory content is equal to WORD_DATA the tag shall go into the state READY and not send any reply. In the case that the comparison fails, the tag shall set its internal counter COUNT to 0, read its UID and send back the UID, as shown in Table 115.

In all other cases the tag shall not send a reply.

ISO/IEC 18000-6:2004(E)

Table 114 — GROUP_UNSELECT_EQ command

Table 115 — GROUP_UNSELECT_EQ response in the case of NO error and comparison fails

Command code = ‘05’

On receiving a GROUP_UNSELECT_NE command, as shown in Table 116, a tag that is in the ID state shall read the 8-byte memory content beginning at the specified address and compare it with the WORD_DATA sent by the interrogator. In the case that the memory content is not equal to WORD_DATA the tag shall go into the state READY and not send any reply. In the case the comparison fails, the tag shall set its internal counter COUNT to 0, read its UID and send back the UID as shown in Table 117.

In all other cases the tag shall not send a reply.

Table 116 — GROUP_UNSELECT_NE command

Table 117 — GROUP_UNSELECT_NE response in the case of NO error and comparison fails

On receiving a GROUP_UNSELECT_GT command, as shown in Table 118, a tag that is in the ID state shall read the 8-byte memory content beginning at the specified address and compare it with the WORD_DATA sent by the interrogator. In the case that the memory content is greater than to WORD_DATA the tag shall go into the state READY and not send any reply. In the case that the comparison fails, the tag shall set its internal counter COUNT to 0, read its UID and send back the UID, as shown in Table 119.

In all other cases the tag shall not send a reply.

ISO/IEC 18000-6:2004(E)

Table 118 — GROUP_UNSELECT_GT command

Table 119 — GROUP_UNSELECT_GT response in the case of NO error and comparison fails

8.2.7.7.11 GROUP_UNSELECT_LT

Command code = ‘07’

On receiving a GROUP_UNSELECT_LT command, as shown in Table 120, a tag that is in the ID state shall read the 8-byte memory content beginning at the specified address and compare it with the WORD_DATA sent by the interrogator. In the case that the memory content is lower than to WORD_DATA the tag shall go into the state READY and not send any reply. In the case that the comparison fails, the tag shall set its internal counter COUNT to 0, read its UID and send back the UID, as shown in Table 121.

In all other cases the tag shall not send a reply.

Table 120 — GROUP_UNSELECT_LT command

8.2.7.7.12 MULTIPLE_UNSELECT

Command code = ‘13’

On receiving a MULTIPLE_UNSELECT command, as shown in Table 122, a tag that is in the ID state shall read the 1-byte memory content beginning at the specified address and compare it with the BYTE_DATA sent by the interrogator. In the case that the memory content is equal to BYTE_DATA and the flag WRITE_OK is set, then the tag shall go into the state READY and not send any reply. In the case that the comparison fails, the tag shall set its internal counter COUNT to 0, read its UID and send back the UID, as shown in Table 123.

In all other cases the tag shall not send a reply.

ISO/IEC 18000-6:2004(E)

Table 122 — MULTIPLE_UNSELECT command

Table 123 — MULTIPLE_UNSELECT response in the case that WRITE_OK is reset or BYTE_DATA is not equal to memory content at ADDRESS

This command may be used to unselect all tags that had a successful write, while tags that had a weak write or write problems stay selected.

8.2.7.7.13 GROUP_SELECT_EQ_FLAGS

Command code = ‘17’

On receiving a GROUP_SELECT_EQ_FLAGS command, as shown in Table 124, a tag that is in the READY state shall compare the FLAGS with the BYTE_DATA sent by the interrogator. In the case that the FLAGS are equal to BYTE_DATA the tag shall set its internal counter COUNT to 0, read its UID and send back the UID, as shown in Table 125, and go into the state ID.

On receiving a GROUP_SELECT_EQ_FLAGS command, a tag that is in the ID state shall set its internal counter COUNT to 0, read its UID and send back the UID and stay in the ID state.

In all other cases the tag shall not send a reply.

8.2.7.7.14 GROUP_SELECT_NE_FLAGS

Command code = ‘18’

On receiving a GROUP_SELECT_NE_FLAGS command, as shown in Table 126, a tag that is in the READY state shall compare the FLAGS with the BYTE_DATA sent by the interrogator. In the case that the FLAGS are not equal to BYTE_DATA the tag shall set its internal counter COUNT to 0, read its UID and send back the UID, as shown in Table 127, and go into the state ID.

ISO/IEC 18000-6:2004(E)

On receiving a GROUP_SELECT_NE_FLAGS command, a tag that is in the ID state shall set its internal counter COUNT to 0, read its UID and send back the UID and stay in the ID state.

In all other cases the tag shall not send a reply.

Table 126 — GROUP_SELECT_NE_FLAGS command

Table 127 — GROUP_SELECT_NE_FLAGS response in the case of NO error

8.2.7.7.15 GROUP_UNSELECT_EQ_FLAGS

Command code = ‘19’

On receiving a GROUP_UNSELECT_EQ_FLAGS command, as shown in Table 128, a tag that is in the ID state shall compare the FLAGS with the BYTE_DATA sent by the interrogator. In the case that the FLAGS are equal to BYTE_DATA the tag shall go into the state READY and not send any reply. In the case that the comparison fails, the tag shall set its internal counter COUNT to 0, read its UID and send back the UID, as shown in Table 129.

In all other cases the tag shall not send a reply.

8.2.7.7.16 GROUP_UNSELECT_NE_FLAGS

Command code = ‘1A’

On receiving a GROUP_UNSELECT_NE_FLAGS command, as shown in Table 130, a tag that is in the ID state shall compare the FLAGS with the BYTE_DATA sent by the interrogator. In the case that the FLAGS are not equal to BYTE_DATA the tag shall go into the state READY and not send any reply. In the case that the comparison fails, the tag shall set its internal counter COUNT to 0, read its UID and send back the UID, as shown in Table 131.

In all other cases the tag shall not send a reply.

ISO/IEC 18000-6:2004(E)

A tag shall only accept a SUCCESS command, as shown in Table 134, if it is in the ID state. In the case that the tag's internal counter COUNT is not zero, the internal counter shall be decreased by 1.

If the resulting COUNT value is 0, then the tag shall read its UID and sent back it in the response, as shown in Table 135.

Table 134 — SUCCESS command

Preamble Delimiter Command CRC-16

Table 135 — SUCCESS response in the case that COUNT is zero

8.2.7.8.1.4RESEND

Command code = ‘15’

The identification algorithm uses RESEND when only one tag transmitted but the UID was received in error. The tag that transmitted resends its UID.

A tag shall only accept a RESEND command, as shown in Table 136, if it is in the ID state. If the COUNT value is 0, then the tag shall read its UID and sent back it in the response, as shown in Table 137.

It shall not send any response.