3-4SectionCommand Types and Responses
39
3-4-5 Polling Auto Read (PR)
Immediately
after the host computer sends a polling auto command, the ID Con
-
troller
returns a response indicating that a command has been received. Subse
-
quently, after waiting for the approach of the DC, the ID Controller reads the
data. During this time, the host computer can use subcommands to query the
command processing results. It can also send commands to the other R/W
Head.
Command Format
PRA/H1/2XXXXXX
Header
Polling
auto
read
Code specification
A: ASCII code
H: HEX code
R/W Head No.
Specify no. of bytes to be read in HEX code.
The number of bytes that can be read in one operation is as follows.
ASCII code specification: 256 bytes (256 characters)
HEX code specification: 128 bytes (256 characters)
Note:
Refer to the previous page for information on the setting val
-
ues.
Start address No. specification range
∗
For 1 to 1 procedure
@ Unit No.
Header
For 1 to N procedure
Polling
auto
read
Code specification
A: ASCII code
H: HEX code
R/W Head No.
Specify no. of bytes to be read in HEX code.
The number of bytes that can be read in one operation
is as follows.
ASCII code specification: 256 bytes (256 characters)
HEX code specification: 128 bytes (256 characters)
Note:
Refer to the previous page for information on
the setting values.
Start address No. specification range
PRA/H1/2XXXXXX FCS
∗
00 to 15
Response Format
PR74
Header
End
code (see page
48)
74: Command received.
Note:
The end code in this case can only be either 74 or
host computer communications error
.
∗
For 1 to 1 procedure
Polling
auto
read
PR74
Header
End code (see page
48)
74: Command received.
Note:
The end code in this case can only be either 74 or
host computer communications error
.
@ Unit No. FCS
∗
For 1 to N procedure
Polling
auto
read
00 to 15
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