ThingMagic M5e-Compact - Manual (Page 116)

Application Tag Commands
116 Command Set
In the event of a communication error the last Get EPC and Metadata request can be
repeated.
When data is requested using this syntax the response will contain as many tags as can
be fit in the response packet. The response will indicate how many tags were returned
and should be processed accordingly.
This version of Get Tag Buffer takes two additional fields: the Metadata Flags which
defines what metadata will be returned and the Read Options which specifies special
read functionality. The following table lists the supported values for these fields.
Get EPC and Metadata Request Fields
Examples
An example command requesting Read Count, AntennaID and Timestamp
Field Value Description
Metadata Flags
(to specify more
than one OR
the values
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 (T hingMagic Only ) will be returned
0x0080 When bit 7 is set up to 4 bytes of tag data will be returned.
Note: This data is only available if the tag buffer entries are
from a Read Tag Multiple (22h) with embedded Read
Tag Data (28h) .
Read Option 0x00 Read the next set of tags from the Tag Buffer
0x01 Re-send the last set of tags.
Note: When setting this option the tags will be resent starting at
the same ReadIndex as the last command. If the
metadata requested is different than the last request the
number of tags returned might be different. To get those
‘missing’ tags, additional Get Tag Buffer commands
should be sent without the re-send option, otherwise it will
reset the ReadIndex again.