3-1SectionData Carrier Motion and Command Conditions
14
3-1 Data Carrier Motion and Command Conditions
3-1-1 Communications Control Procedure
The procedure for communications with the host computer is based on
OMRON’s
SYSMAC W
AY Host Link System procedure.
Communications
with
host computer
Host computer
ID Controller
R/W Head
DC
Local communications
(2)
(1)
(3)
Command
Response
Host communications:
Communications between host
computer and ID Controller
Local communications:
Communications between
R/W Head and DC
Explanation
1, 2, 3...
1. The host computer sends a command to the ID Controller.
2. The
ID Controller interprets the host computer command and executes local
communications, and writes/reads data to/from the DC memory.
3. If
it is a read command, the data read out is sent to the host computer as
the
response.
If it is a write command, a
message indicating the completion of
processing is sent to the host computer as the response.
When the V600-CA2A-Vj is used, the following procedure is used to control
communications with the host computer.
1, 2, 3...
1. The
host computer has the
initial transmission right, which is transferred to
the ID Controller after command transmission is completed.
2. Once
the response is returned from the ID Controller
, the transmission right
goes back to the host computer.
The transmission right is transferred by pressing the carriage return key.
Different
control procedures are available for the 1 to 1 procedure and the 1 to N
procedure.
• The
1 to N procedure
is used for connection of multiple (up to four) ID Control
-
lers
to one host computer
.
A control number is inserted at the head of all com
-
mands
and responses to identify the ID Controller
. A horizontal parity check is
included to ensure effective error detection.
• The
1 to 1 procedure is used when only one ID Controller is connected to the
host
computer
. The horizontal parity check is not included to simplify the
proce
-
dure.
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