User's Manual

SHENZHEN SYS IoT CO., LTD. 12 / 34
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Post Code：518055
Picture 13A
(1) PC, tag protocol control word, in which the definition of the length (word length, 2 bytes) and
memory structure of the tag EPC is defined. The high 15~11bit of the PC value defines the word
length of the EPC data. The PC value is 10th. The UMI (User-memory indicator) defines whether the
tag has a User area, UMI=0, no User area, UMI=1, and User. Area. It should be specially noted that
UMI is a new addition to the new version of the ISO18000-6C labeling protocol. Some old versions of
the tag may not have this parameter.
PC
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
PC Length
UMI
The storage starts from the bit address 0x00 of the EPC area, namely the word address 0x00 is stored.
E.g:
PC=0x3000, EPClength=001102=0x06(HEX), 6 words long, 12 bytes, 96 bits long (0x60);
UMI=0, no User area.
PC = 0x3400, EPC length = 001102 = 0x06 (HEX), 6 words long, 12 bytes, 96 bits long (0x60);
UMI = 1, with User area.
(2) EPC, Electronic Product Code, EPC data of rfid tags, as the EPC ID value of the tag, readable and
writable. The storage starts from the bit address 0x20 of the EPC area, namely, the word address 0x02
is stored.
3) CRC, CRC check value, defines the CRC check value of PC+EPC data, and the tag automatically
modifies and stores the value. The storage starts from the bit address 0x00 of the EPC area, namely,
the word address 0x00 is stored.
(4) RSSI, Signal Strength, Received Signal Strength Indication, which reflects the return signal
strength of the rfid tag received by the reader module or the quality of the received tag signal. RSSI is
a negative value in dBm. The larger the RSSI, the greater the signal strength returned by the reflected
label; conversely, the smaller the signal strength returned by the label. For example, the signal strength
of RSSI = -53 dBm is better than RSSI = -65 dBm.
(5) CNT, Label read times statistics;;
(6) PER, Packet Error Rate, frame error rate;