120
SECTIO
N
6
ID
Se
ns
or Unit
O
p
era
tion
RFID System
User's Manual
SECTION 6
Controlling the ID Sensor Unit
Commands Used to Read Data (Intelligent I/O Instruction Data
Transfer for Read and Read with Error Correction)
1) Use the user program to set the processing address, number of processing bytes, data storage word
address, and other parameters for reading RF Tag data in the Special I/O Unit Area.
2) Use the user program to turn ON the Command Execution Bit (CIO n, bit 00) in the Special I/O Unit
Area.
3) When the ID Sensor Unit detects that the Command Execution Bit has turned ON, it turns ON the ID
Busy Flag (CIO n+7, bit 00).
4) The ID Sensor Unit reads the data from the RF Tag, places the Results Information (CIO n+8) and
Processing Results Monitor information (word n+9) in the Special I/O Unit Area, turns OFF the ID
Busy Flag (CIO n+7, bit 00), and turns ON the Normal End Flag (CIO n+7, bit 01) for one scan.
5) Use the IORD instruction in the user program to transfer the read data to the data storage words
after the Normal End Flag (CIO n+7, bit 01) turns ON. Then use the Results Information (CIO n+8),
the Processing Results Monitor information (CIO n+9), and the read data.
The Results Information (CIO n+8) will be held until the Error Reset Bit (CIO n, bit 01) is turned ON
or until the next communications command is received.
• By using the IORD instruction, up to 2,048 bytes of data can be transferred in one scan.
(1)(2)
(5)
(3)(4)
(4)
(4)
Amplifier or Antenna
Special I/O
Unit Area
CIO n to
CIO n+6
CIO n+7
Data storage
area
Read
data
CS/CJ-series CPU Unit
ID Sensor Unit
CIO n+
8
to CIO n+9
RF T
a
g
Summary of Contents for CJ1W-V680C11
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