RFID System
User’s Manual
SECTION 7
Characteristics According to Operating Conditions
SECTION 7
Appendices
259
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. This
is the value found above.
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 transmission time
RDA1........... *CR RD00123 ............... *CR
TAT
*CR CR CR CR CR
TAT
CR
CR CR CR
.........CR
TAT
Command Response
Tag
communications
time
(Command)
XRA1.................
ID Controller
Host
Frame 1
(Response 1)
Frame 2
(Response 2)
Frame n
Frame n-1
(Response n)
(Response n-1)
(Delimiter)
(Delimiter)
(Delimiter)
(Delimiter)
Response transmission time
Tag
communications
time
ID Controller
Host
Command transmission
time
Command transmission time
(Response 1)
(Command)
XWA1.................
(Response 2)
Tag
communications
time
(Response n)
Response
transmission
time
(Response n-1)
.........*CR
XW00 *CR
Normal Commands
EXPANSION READ Command
EXPANSION WRITE Command
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