41
RFID System
User's Manual
Section 3 TAT and Communication Time (Reference)
Section 3
Communications Specifications
TAT (Turn Around Time)
“TAT” is the total time from the start of command transmission by the host device (e.g., a personal computer) until
a response is received by the host device.
Command transmission time: The time required to send a command from the host device to the ID Controller.
The command transmission time varies depending on the baud rate and the
communications format.
Tag communications time: The processing time for communications between the Antenna and Tag.
Response reception time: The time required to return a response from the ID Controller to the host device.
The response reception time varies depending on the baud rate and the
communications format.
TAT =
Command transmission time + Tag communications time + Response reception time
RDA1- - - - *CR RD001234- - - - *CR
Tag
communications
time
TAT
(Command)
Response
XRA1- - - - *CR
Frame 1
(Response 1)
CR
(Response 2)
(Delimiter)
CR
(Delimiter)
CR
(Delimiter)
(Response n-1)
CR
(Response n)
(Delimiter)
Command
transmission time
Response reception time
TAT
Host device
ID Controller
XWA1- - - - *CR
Command transmission time
Response
reception
time
TAT
Host device
ID Controller
- - - - -CR
CR
(Response 1)
CR
(Response 2)
CR
(Response n-1)
- - - - -CR
XW00*CR
(Response n)
(Command)
(Command)
Tag
communications
time
Tag
communications
time
Frame 2 Frame n-1
Frame n
• Normal Commands
• EXPANSION READ Command
• EXPANSION WRITE Command
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