User's Manual

UHF RFID Reader UR - SERIES User Manual v1.14
1
1 Interface specification
Communication between host and reader is based on UART or USB. Host delivers commands on
these interfaces and reader will produces response and execute the delivered commands.
Data Frame Format
1 start bit, 8 data bits, 1 stop bit
Parity
NONE
Default Baud Rate
57600 bps
Transmission order
Least-significant bit first
2 Protocol Description
In a typical communication, host delivers command and parameters to reader, reader should execute
the command and provide result or data response. Reader will receive and execute ONE command
in every communication cycle. Reader will not able to receive new command before the last
execution and response delivery is completed. Any command which is transmitted during command
execution will be ignored by the reader.
Command delivery from host:
Host
Direction
Reader
Command frame
→
Description:
Once a command is received by reader, the reader will produce a response to host within the
predefined inventory time. Data communication time is negligible here.
During communication, the transmitting time gap between every two consecutive bytes should be
less than 15ms. If the time gap exceeds 15ms, all the received data should be discarded and a
normal receiving process restarts from the next byte.
Response delivery from reader:
Reader
Direction
Host
Response frame
→
Description:
During communication, the transmitting time gap between every two consecutive bytes should be
less than 15ms.
A typical communication process is stated below:
1. Host delivers command to reader and wait for response;
2. Reader receives command, starts specific operation according to the received frame and produce
response (of operation status and/or data) to host;
3. Host receives response from reader.