R
EM4223
9. COMMANDS AND STATES
Commands
The EM4223 supports the commands as specified in Table 5- Supported Commands and as set out in ISO/IEC CD 18000-
6A clause 7.6 and clause 7.7.
Tag States
FST = 0 & WUS = 1 & RF field on
FST = 0 & WUS = 0 & RF field on
RF FIELD OFF
Quiet Flag set ( power off < 2 secs)
READY
Reset_to_ready
Reset_To_Ready
Begin_Round(Match) #
Begin_Round(Unmatch) #
Init_Round(Unmatch) #
Init_Round(Match) #
Init_Round_All #
Wake_Up_FST @
Next_Slot (Not OK)
Close_Slot
New_Round
Next_Slot (OK)
QUIET
ROUND_ACTIVE
End of FST Tag Internal Slot
Begin_Round(Match) #
Init_Round(Match) #
Init_Round_All #
Wake_Up_FST @
Next_Slot (Not OK)
Close_Slot
New_Round
All commands except:
"Reset_To_Ready"
Standby_Round
(Incomplete or Unrecognised Cmnd) & FST=0
Begin_Round(Match) #
Init_Round(Match) #
Init_Round_All #
Wake_Up_FST @
2.5 Message Timeout if FST = 0 & WUS = 0
Standby_Round
Incomplete or Unrecognised Cmnd
ROUND_STANDBY
Reset_To_Ready
Begin_Round(Unmatch) #
Init_Round(Unmatch) #
Fig. 19– State transition diagram showing commands.
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