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Communications Time
7-1
Communications Time
In the V720S-series Reader/Writer, actual communications with a Tag are performed by reading or
writing four-byte data per page.
•
The following chart specifies the TAT (turn-around time) and actual communications time.
The actual communications time in the following chart is the time required for communications
•
between the Antenna and Tag, not including communications with the host. Use this for
calculating the speed of the Tag for the execution of auto commands.
Ex.)
Command
1) Standard Mode
8 0 0
TAT(ms)
7 0 0
6 0 0
5 0 0
4 0 0
3 0 0
2 0 0
1 0 0
0
7-2
Actual
communications time
T A T
Writing
Reading
Special reading
1
2
3
4
5
6
7
8
Number of pages processed
Calculation Formula
Special reading
Read
Write
N: Number of pages processed
Note • The provided TAT graph data shows an example in which the
V720S-BC5D4 Controller is used with the following communications
specifications for host communications: The data is continuously sent with
no space between characters, at a baud rate of 38,400 bps, in a data length
of 7 bits with 1 start bit, 2 stop bits and even parity.
• The number of bytes in TAT data is the number of code-specified bytes in
ASCII.
Response
Actual
8 0 0
communicati
7 0 0
ons time
(ms)
6 0 0
5 0 0
4 0 0
3 0 0
2 0 0
1 0 0
0
9
1 0 1 1
Actual communications time (ms)
T = 1.3N + 43.4
T = 1.3N + 91.6
T = 54.2N + 90.0
Writing
Reading
Special reading
1
2
3
4
5
6
7
Number of pages processed
(msec)
Section 7-1
8
9
1 0 1 1
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