4-4
Section
Types of Commands and Responses
41
Subcommand Format
P
R
C/E
1
Header
R/W Head No. specification (fixed to 1)
∗
Polling auto
read
Inquiry on result of polling auto
processing/termination
C: Inquiry on result of processing
E: Termination
Subcommand Response Format
P
R
0
0
X
X
X
X
Header
Polling auto
read
∗
Read data (on normal completion only)
End code
00: Normal completion
74: Data Carrier not approaching (2nd time or later)
75: Polling auto processing terminated (before com-
munication processing with Data Carrier)
76: Polling auto processing terminated (when Data
Carrier has approached and during or after commu-
nication processing with Data Carrier)
4-4-8 Polling Auto Write (PW)
When the host computer transmits the polling auto command, the ID Controller
immediately responds, indicating the reception of the command. After that, the
ID Controller writes 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
W
A/H
1
X
X
X
X
X
X
X
X
1 frame = 266 characters max.
∗
Header
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.
Polling auto
write
Response Format
P
W
7
4
Header
End code
74: Command received
Note: In this case, the end code is
either 74 or host communication
error.
∗
Polling auto
write