4-4
Section
Types of Commands and Responses
40
4-4-6 Auto Write (AW)
Writes data when the Data Carrier has approached. The ID Controller responds
when the lower communication has ended.
Command Format
A
W
A/H
1
X
X
X
X
X
X
X
X
1 frame = 266 characters max.
∗
Header
Auto write
ASCII/HEX code specification
A: ASCII code, JIS 8 code
H: HEX code
R/W Head No. specification
(fixed to 1)
Specify the number of bytes to be written.
The number of bytes that can be read at a time is as follows:
ASCII: 256 characters (256 bytes)
HEX: 256 characters (128 bytes)
First address No. specification range
0000-07FF (2KB type)
0000-1FFF (8KB type)
Note: Addresses 0000 and 0001 cannot be written as these
are a production date area.
Response Format
A
W
0
0
Header
End code
00: Normal completion
∗
Auto write
4-4-7 Polling Auto Read (PR)
When the host computer transmits the polling auto command, the ID Controller
immediately responds, indicating the reception of the command. After this, the
ID Controller reads data when the Data Carrier approaches. Meanwhile, the
host computer can make an inquiry on the result of the command processing by
using a subcommand.
Command Format
P
R
A/H
1
X
X
X
X
X
X
Header
Polling auto
read
ASCII/HEX code specification
A: ASCII code, JIS 8 code
H: HEX code
R/W Head No. specification
(fixed to 1)
Specify the number of bytes to be read in HEX code. The
number of bytes that can be read at a time is as follows:
ASCII: 256 bytes (256 characters)
HEX: 128 bytes (256 characters)
First address No. specification range
0000-07FF (2KB type)
0000-1FFF (8KB type)
∗
Response Format
P
R
7
4
Header
End code
74: Command received
Note: In this case, the end code is ei-
ther 74 or host communication error.
∗
Polling auto
read