3-1SectionData Carrier Motion and Command Conditions
19
8. Once processing is completed, the ID Controller sends a response to the
host computer indicating that the processing indicated by the query sub-
command has been completed.
3-1-6 Polling Auto Function with 1 to N Connection (V600-CA2A-Vj
Only)
This
section describes command processing when
one R/W Head is connected
to each of two ID Controllers (Unit 1 and 2). In the case of normal auto com-
mands,
the ID Controller does not return a response until the DC comes close to
the specified R/W Head. This means that until the response
is
sent, the commu
-
nication path with the host computer remains in the busy condition, and the host
computer
cannot send commands to the other R/W Head. However
, the polling
auto
command enables the ID Controller to return the response when requested
by
the host computer
. Thus, the busy condition on
the communication path to the
host computer is cleared, and the host computer can then send commands to
the other R/W Head.
(Host
Computer)
Polling auto
command
Sub-
command
Response
DC
Response
(ID Controller)
(DC)
Not close
Not close
(Unit 1
R/W Head 1)
Polling auto
command
(Inquiry to unit 1
R/W Head 1)
Sub-
command
Response
(Not close to Unit 1
R/W Head 1)
Read/W
rite
processing
Response
Passes on
Not close
(Unit 1
R/W Head 1)
(Unit 2
R/W Head 2)
(Inquiry to unit 2
R/W Head 2)
Sub-
command
(Inquiry to unit 1
R/W Head 1)
(Unit 2
R/W Head 2)
(Unit 1
R/W Head 1
processing
completed)
Response
(Not close to Unit 2
R/W Head 2)
(Unit 1
R/W Head 1)
Not close