srt512 STMicroelectronics, srt512 Datasheet - Page 29

• Manufacturer Part Number: srt512
• Description: 13.56 Mhz Short-range Contactless Memory Chip With 512-bit Eeprom And Anticollision Functions
• Manufacturer: STMicroelectronics

SRT512
8.2
PCALL16() command
Command Code = 06h - 04h
The SRT512 must be in INVENTORY state to interpret the PCALL16() command.
On receiving the PCALL16() command, the SRT512 first generates a new random
CHIP_SLOT_NUMBER value (in the 4 least significant bits of the Chip_ID).
CHIP_SLOT_NUMBER can take on a value between 0 an 15 (1111
until a new PCALL16() or INITIATE() command is issued, or until the SRT512 is powered off.
The new CHIP_SLOT_NUMBER value is then compared with the value 0000
match, the SRT512 returns its Chip_ID value. If not, the SRT512 does not send any
response.
The PCALL16() command, used together with the SLOT_MARKER() command, allows the
reader to search for all the Chip_IDs when there are more than one SRT512 device in
INVENTORY state present in the reader field range.
Figure 24. PCALL16 request format
Request parameter:
Figure 25. PCALL16 response format
Response parameter:
Figure 26. PCALL16 frame exchange between Reader and SRT512
Reader
SRT512
No parameter
Chip_ID of the SRT512
SOF
SOF
SOF
06h
06h
04h
PCALL16
CRC L
Chip_ID
8 bits
CRC H EOF
04h
8 bits
CRC L
<-t 0 -> <-t 1 ->
8 bits
CRC L
SOF
CRC H
8 bits
Chip_ID
CRC H
8 bits
b
). The value is retained
SRT512 commands
CRC L CRC H
EOF
b
. If they
EOF
AI07671
AI07673
EOF
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