76
Se
ct
io
n 5
Mo
veme
nt of
Da
ta
Car
rie
rs an
d Co
m
m
a
nd Sta
tus
RFID System
Operation Manual
Section 5
Communications
Polling
This section describes command processing when two Read/Write Heads are connected to one ID
Controller. For normal Auto Commands, the ID Controller does not return a response until the Data
Carrier approaches the specified Read/Write Head. This means that the communications path with the
host device remains in the Busy Status, and the host device cannot send commands to the ID Control-
ler's other Read/Write Head.
However, Polling Auto Commands enable the ID Controller to return a response when requested by the
host device. Thus, the Busy Status of the communications path to the host device is cleared and the
host device can send commands to the ID Controller's other Read/Write Head.
1. A Polling Auto Command is sent to Head 1.
2. The ID Controller receives the command and
returns a response indicating that it has
received the command.
3. A Polling Auto Command is sent to Head 2.
4. The ID Controller receives the command and
returns a response indicating that it has
received the command.
5. The host device can check the status of
processing or end polling auto processing
using subcommands.
6. When a Data Carrier is not close to the
specified Read/Write Head, a “no Data Carrier”
response is returned in response to a check
subcommand.
7. When a Data Carrier passes by the Read/Write
Head, data is read or written.
8. Once processing has been completed, the ID
Controller sends a response to the host device
indicating that the processing indicated by the
check subcommand has been completed.
Host device
ID Controller
Data Carrier
Pollin
g
Auto
Command
Head 1
Head 2
Pollin
g
Auto
Command
Subcommand
Pollin
g
head 1 check
Pollin
g
head 2 check
Subcommand
Subcommand
Response
Pollin
g
head 1 check
Response
Response
Response
Head 1
Head 2
Not approachin
g
Head 1
Not approachin
g
Head 2
Read or write
processin
g
Head 1
Response
Head 1 processin
g
completed
Not approachin
g
Not approachin
g
Not approachin
g
Not approachin
g
Data Carrier
Passin
g
Summary of Contents for V600 Series
Page 50: ...48 Section 2 Wiring RFID System Operation Manual Section 2 Installation and Wiring MEMO ...
Page 72: ...70 Section 4 Write Command Memory RFID System Operation Manual Section 4 Function ...
Page 138: ...136 Section 5 End Codes RFID System Operation Manual Section 5 Communications MEMO ...