Communications Time
Section 7-1
7-3
Fast mode
Calculation Formula
Operation
Actual communications time
(ms)
Special reading
T = 1.3N + 6.2
Normal reading
T = 1.3N + 12.7
Writing
T = 13N +13.5
Note N: Number of pages processed
Actual Communications
Time in Multiple,
Simultaneous Access
Mode
The actual communications time between the Controller and Tag with
multiple, simultaneous access mode varies with the operating conditions,
such as the number of Tags in the communications area as well as the
number of bytes to be processed. Refer to the following table for standard
values in consideration of these conditions.
2 page(8 bytes) to read (ms)
2 page(8 bytes) to write (ms)
Number of
Tags
Timeslot setting
(Number of
Timeslot)
Standard mode
Fast mode
Standard mode
Fast mode
2
1
560
144
715
190
4
2
917
301
1139
378
8
3
1659
644
2016
784
16
4
3239
1391
3867
1656
Note
1.The provided TAT data is an example in which the V720-CD1D
Controller is used under the following conditions for host
communications:
The data is continuously sent with no space between characters, a baud
rate of 38,400 bps, and a data length of 7 bits with 2 stop bits and even
parity.
2.The number of bytes in TAT data is the number of code-specified bytes
in ASCII.
Note When using auto commands, there is a difference in communication time
which changes as the Tag approaches the Antenna’s communications range.
Calculate the communications time by adding 1 to the actual number of
processing pages (e.g., 1 page becomes 2, etc.), and calculating the travel
time from this value and the communications range. During actual operation,
consider the effect of noise, etc., on-site, and design a system that also has
sufficient margin from the travel time.
Number of pages processed
Writing
Normal
reading
Special
reading
Writing
Normal
reading
Special reading
Number of pages processed
Actual
communications
time (ms)
