User Guide

Table Of Contents
eGo/SeGo Tag Command Set
80
Read Tag ID Single (21h)
The Read Tag ID Single command executes a query for tags matching the criteria
specified by the Command Type and subsequent fields and returns the first tag found.
Read Tag ID Single Request Fields
Field Value Description
TM OpCode 0x21 TM OpCode
Timeout [2 bytes] Indicates how long the command should spend attempt-
ing the operation, in milliseconds.
TM Options Bit 0 1 - Indicates Command Type and additional fields to
follow.
Bit 4
(LSB=bit 0))
0 - Metadata flags must not be passed and Meta
Data will not be returned.
1 - Metadata flags must be passed and the
corresponding Metadata shall be returned with the
tag EPC.
Metadata Flags (to specify
more than one OR the val-
ues together)
0x0000 When no flags are set no meta data will be returned,
only the tag EPC (including PC bits and tag CRC)
0x0001 When bit 0 is set the Read Count will be returned
0x0002 When bit 1 is set the LQI/RSSI will be returned
0x0004 When bit 2 is set the Antenna ID will be returned
0x0008 When bit 3 is set the Frequency will be returned
0x0010 When bit 4 is set the Timestamp will be returned
0x0020 When bit 5 is set the RFU (ThingMagic Only) will be
returned
0x0040 When bit 6 is set the Protocol is returned.
Command Type [1 byte] Indicates the Group Select criteria to apply as defined in
Group Select Options.
Byte Address [1 byte]
Byte Mask [1 byte]
Word Data [8 bytes]