User's Manual

UHF RFID Reader UR - SERIES User Manual v1.14
47
Len
Adr
reCmd
Status
Data[]
CRC-16
Ant
Num
Data Packet
0xXX
0xXX
0x19
0xXX
0xXX
0xXX
Packet-1, Packet-2, Packet-3…
LSB
MSB
Parameters definition
Status: the status of response, detail description is shown in the following table
Status
Description
0x01
Operation completed, reader will report all inquired tags information to host
0x02
Inventory timeout, operation is aborted. reader will report all the already
inquired tags to host
0x03
Reader is not able to response all the data in a single frame, further data will
be transmitted in the following frames.
0x04
Reader only completed parts of the inventory but run out of memory space
due to the amount of tags. Reader will report all the already inquired tags as
well as this status value to host.
0xF8
Antenna error detected, the current antenna might be disconnected.
Ant: indicates which antenna had inquired a tag. For example, 0x04 is 0000 0100 in binary, this
indicates Antenna 3 had inquired this specific tag. For 0x08, it is 0000 1000 in binary, then it
indicates Antenna 4 had inquired tag information.
Num: the amount of tag information data packets included in this response.
Data Packet: inquired tag data, Packet-1 is data of the first packet, Packet-2 is data of the second
packet etc. The format of a typical packet is shown below:
Packet
PacketParam
Len
Data
RSSI
0xXX
0xXX
variable
0xXX
Parameters data packet:
PacketParam: 1 byte, parameters of this packet.
bit7: the type indicator of this data packet.
0 – this data packet contains tag EPC number;
1 – this data packet contains inquired tag data (the EPC number of this tag is delivered in the
last data packet).
bit6 ~ bit0: the serial number of the data packet. The range of the serial number is 0 ~ 127. At the
beginning of ever mix inventory, the packet serial number will restart from 0, and increase for ever
uploaded data packet. Once serial number reaches the maximum value 127, it will recount again
from 0.
Len: 1 byte, the length of data in this packet.
Data: the EPC number or the inquired data from a specific area of a tag. The unit of EPC C1 G2
tag data is word. During communication, the most-significant word and the most-significant byte in
a word will be transmitted first.