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Section 5 Communications Commands
RFID System
Operation Manual
Section 5
Communications
POLLING AUTO READ (PR)
For POLLING AUTO READ, the ID Controller immediately returns a response informing the host device
that the command has been received (end code: 74 = polling command received). The ID Controller
then waits for a Data Carrier to approach and reads data from Data Carrier memory. During this time,
the host device can check the results of command processing by using a subcommand. Also, the host
device can send commands to the other Read/Write Head.
■ 1:1 Communications
Data code specification Specifies the type of code in which to send the read data in the response.
A: ASCII
H: Hexadecimal
R/W Head No. Specifies the Read/Write Head with which to communicate.
1: Read/Write Head 1
2: Read/Write Head 2
Read area start address Specifies the first address from which to read data from the Data Carrier as a four-digit hexadeci-
mal number.
Specifiable range: 0000H to FFFFH
No. of read bytes Specifies the number of bytes of data to read from the Data Carrier as a two-digit hexadecimal
number. Up to 256 bytes can be read with one command.
Specifiable range: 00H to FFH (The maximum of 256 bytes will be read if 00H is specified.)
• ASCII specification: 256 bytes (256 characters)
• Hexadecimal code specification: 256 bytes (512 characters)
End code Indicates the results of command execution.
74: Polling command received.
The only error codes returned here are 74 and error codes for communications errors with the
host.
Refer to End Codes for more information.
p.135
xx
PR
xx
A/H 1/2
xx
211 4 2
2
*CR
Command code
Data code
specifica-
tion
Read area start address
No. of
read bytes
Terminator
R/W Head No.
Command code
PR
74
22
2
*CR
Terminator
End code
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