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Section 5 Communications Commands
RFID System
Operation Manual
Section 5
Communications
Communications Commands
The commands used to perform communications with Data Carriers are described in this section.
READ (RD)
For READ the ID Controller reads data from Data Carrier memory. If there is no Data Carrier in the
communications area, an error response with an error code of 72 (Data Carrier missing) will be
returned.
■ 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. An end code of 00 is returned for a normal end.
Refer to End Codes for more information.
p.135
Read data The data read from Data Carrier memory. The number of characters will be the same as the num-
ber of read bytes for ASCII data and twice the number of read bytes for hexadecimal data.
xx
Command code
RD
xx
A/H 1/2
xx
No. of read
bytes
211 4 2
2
*CR
Terminator
Read area start address
Data
code speci-
fication
R/W Head No.
Command code
RD
x
00
xx
22 n
2
*CR
Terminator
Read dataEnd code
x
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