Omron V600 Series Operation Manual page 19

Data Carrier Motion and Command Conditions
3-1-5 Polling Function
4. Once processing is completed, the ID Controller sends a response to the
host computer indicating that processing indicated by the auto command
has been completed.
Functions
The following describes command processing when two R/W Heads are con-
nected to one ID Controller. In the case of normal auto commands, the ID Con-
troller 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 communications path with
the host computer remains in the busy status, and the host computer cannot
send commands specifying the ID Controller's 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
Read
Read
Auto Read
Polling Auto Read
Write
Write Auto Write
Polling Auto Write
Section 3-1
17