User's Manual

22
3-3 Communication Time
HOST
Command
4S2VR-V720-KR11
Tag
Command
Response
Response
Command
Command 2
Response
Response
Tag
Transmission
time
TAT
Transmission time and TAT (Turn Around Time) is displayed below as the communication time.
HOST
KR11
Tag
RF interface
TAT is the sum of (host communication time + RF interface communication time + processing time of controller).
Since the baud rate is 9600bps, compute the host communication time for the length of the communication frame of
command and response (byte), letting 1 byte=2ms. The processing time of the controller (for two communication
times) is shorter enough to be ignored, compared with the communication time. The RF interface communication
time is described below. The RF interface communication time refers to the transmission processing time
between the reader and tag. This processing time varies in accordance with the number of pages to be read and
written and specified method.
z
When the number of pages to be read and written are continuously specified.
Calculating formula
Read
Write
N: Number of pages to be processed
z
When the number of pages to be read and written are not specified continuously.
Calculating formula
Read
Write
N
R
: Largest specified page number - Smallest specified page number)
N
w
: Number of pages to be written
T=1.3N
R
+6.0
T=12.3N
W
+1.3N
R
+15.5
T=1.3N+6.0
T=13.6N+15.5
Command
Command
Transmission time (ms)
Transmission time (ms)