srt512 STMicroelectronics, srt512 Datasheet - Page 30

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

SRT512 commands
8.3
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SLOT_MARKER(SN) command
Command Code = x6h
The SRT512 must be in INVENTORY state to interpret the SLOT_MARKER(SN) command.
The SLOT_MARKER Byte code is divided into two parts:
On receiving the SLOT_MARKER() command, the SRT512 compares its
CHIP_SLOT_NUMBER value with the SLOT_NUMBER value given in the command code.
If they match, the SRT512 returns its Chip_ID value. If not, the SRT512 does not send any
response.
The SLOT_MARKER() command, used together with the PCALL16() 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 27. SLOT_MARKER request format
Request parameter:
Figure 28. SLOT_MARKER response format
Response parameters:
Figure 29. SLOT_MARKER frame exchange between Reader and SRT512
Reader
SRT512
b
with fixed value 6.
b
and 15. The value 0 is reserved by the PCALL16() command.
x: Slot number
Chip_ID of the SRT512
3
7
to b
to b
SOF
0
4
: 4-bit command code
: 4 bits known as the SLOT_NUMBER (SN). They assume a value between 1
SOF
SOF
X6h
CRC L
SLOT_MARKER
Chip_ID
8 bits
X6h
CRC H EOF
<-t 0 ->
8 bits
CRC L
8 bits
CRC L
<-t 1 ->
SOF
CRC H
8 bits
CRC H
8 bits
Chip_ID
CRC L CRC H
EOF
EOF
AI07671
AI07675
SRT512
AI13509b
EOF