R
EM4223
MSB
LSB
1
128
40
33
32
Serial number (Lower 32
bits of UUD)
Upper bits of UUD
MSB
40
LSB
1
33
32
Serial number
IC Mfg code “0x16”
Hard wired in EM4223.
Fig. 18- UUD/SUID mapping
Transponder Unique Identifier (UID) & SUID
Personality Block
An ISO 18000-6A Transponder does not transmit the UID
The personality block contains 3 control bits. The default
state of these bits is programmed during manufacture.
These bits control the Wake Up Status flag (WUS), the
power up selection of FST or ISO mode of operation and
the Return Link Bit Rate.
except
in
response
to
the
optional
ISO
Get_System_Information command which is not
supported in the EM4223. All other transactions are
conducted using the SUID (which is supported).
Transponders will power up in the default mode set by the
bits programmed during manufacture. Only the FST/ISO
mode flag can be changed by Reader commands.
Transponders will be switched to FST mode by the
The Interrogator derives the Transponder 64 bit UID from
the SUID and it is made up as follows:
Bits 57 Æ 64 are always set to Hex ‘E0’.
Bits 49 Æ 56 carry the Integrated Circuit
Manufacturers Code
WAKE_UP_FST
command.
INIT_ROUND,
INIT_ROUND_ALL and BEGIN_ROUND commands will
switch Transponders to the ISO mode of operation.
Bits 33 Æ 48 are always set to Hex ‘0000’
Bits 1 Æ 32 carry the 32 bit Serial number.
The state of the WUS bit cannot be changed from the
value set during manufacture. Transponders will operate
in ISO or MOD_ISO mode depending on the factory
programmed state of the WUS bit. Similarly,
Transponders will operate as TTF or as RTF in FST
mode depending on the factory programmed state of the
WUS bit. It is important to note that tags can only switch
between MOD_ISO and FST (TTF) or between ISO and
FST (RTF) modes.
AFI
Application Family Identifier - 8 bits per ISO 18000-6
clause 7.2.3. If the AFI byte is set with all 00 the tag will
respond, or if the AFI in the tag matches the AFI byte in
the init-round command the tag will respond, otherwise
the tag will remain quiet.
Wake Up
Status
Flag
Transponder SUID and
Roundsize Initialize
Conditions
FST/ISO Flag
Tag State
Mode
(pbit 1)
(pbit 0)
Power Up Condition
READY – Transponder replies in its selected
slot in each round.
READY - Transponder replies in both the first
slot and its selected slot in every round
ROUND_STANDBY state, Reader Talks First
mode
1
1
0
0
1
0
1
0
Don’t care
Don’t care
ISO
MOD_ISO
FST (RTF)
FST (TTF)
SUID flag = 0
Roundsize = 16
SUID flag = 0
ROUND_ACTIVE –Tag Talks First mode
Roundsize = 16
Table18 - Transponder Operational Modes
Personality Block 0- Bit 2 determines the Transponder Reply data rate:
0 = 40 kb/s
1 = 160 kb/s
20
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