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5-3 Communications Time (Reference)
Example: Reading data from pages 1, 5, and 9
T = 1.3 × ( 9 - 1 + 1 ) + 6.2 = 17.9 ms (for I-CODE1)
T = 1.3 × (9 - 1 + 1 ) + 6.0 = 17.7 ms (for I-CODESLI)
Example: Reading data from pages C, 5, and 9
T = 1.3 × (9-(-4)+1) + 6.2 = 24.4ms (for I-CODE1)
T = 1.3 × (12-5+1) + 6.0 = 16.6ms (for I-CODESLI)
Example: Writing data to pages 2, 4, 9, and 10
T = 11.7 × 4 + 1.3 × ( 10 - 2 + 1 ) + 13.5 = 72ms (for I-CODE1)
T = 12.3 × 4 + 1.3 × ( 10 - 2 + 1 ) + 15.5 = 76.4ms (for I-CODESLI)
Communications Time Calculation Conditions
•
Communications mode: Single Trigger Mode
•
Communications errors must not occur, such as due to noises.
5-3-2 TAT (Turn Around Time)
The TAT is the time taken from when the host control unit sends a command to the RFID Unit, to when
a response is received and completed.
The time differs depending on the baud rate and the communications control method setting.
Example of TAT Calculation
Example: Reading from page 0 to page 4
(1)During command send
9[char.] × 11 [bits] / 9600[bps] × 1000[ms/s] ≈ 10.32ms
(2)During communications
6.5 + 6.2 = 12.7ms
(3)During reception of response
43[char.] × 11 [bits] / 9600[bps] × 1000[ms/s] ≈ 49.27ms
The TAT in to the above example is (1) + (2) + (3) = 72.29
ms.
The calculations are performed according to the following conditions.
•
Communications mode
•
Communications control method
•
Baud rate
•
Data code specification
Commands sent from the host control unit are sent continuously without spaces between the
•
characters.
•
Communications errors must not occur, such as due to noises.
5-8
I-CODE1
: Single Trigger Mode
: CR control
: 9,600 bps
: Hexadecimal
I-CODESLI
(1)During command send
11[char.] × 11 [bits] / 9600[bps] × 1000[ms/s] ≈ 12.61ms
(2)During communications
6.5 + 6.0 = 12.5ms
(3)During reception of response
43[char.] × 11 [bits] / 9600[bps] × 1000[ms/s] ≈ 49.27ms
The TAT in to the above example is (1) + (2) + (3) = 74.38
ms.
Section 5-3
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