93
RFID System
Operation Manual
Section 5 Communications Commands
Section 5
Communications
EXPANDED READ (ER)
For EXPANDED READ, the ID Controller reads up to 8 KB of 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
Less than 242 Characters in Read Data
More Than 240 Characters in Read Data
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 four-digit hexadecimal
number. Up to 8192 bytes can be read with one command.
Specifiable range: 0001H to 2000H
• ASCII specification: 8192 bytes (8192 characters)
• Hexadecimal code specification: 8192 bytes (16384 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 number of
read bytes for ASCII data and twice the number of read bytes for hexadecimal data.
xx
Command code
ER
xx
A/H
xx
211 4
2
*CR
Terminator
Read area start address
xx
No. of read bytes
4
1/2
Data code
specifica-
tion
R/W Head No.
x
Command code
ER
x
00
xx
22 n
2
*CR
Terminator
Read dataEnd code
ER
CR
CR
CR
CR
00
1 frame = 245 characters max.
240 characters
240 characters
Read data 1
240 characters or less
Read data 2
Read data n-1
Read data n
*
*CR
A/H 1/2ER
Start address No. of read bytes
:
Frame 1
Frame 2
Frame n-1
Frame n
20 ms
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