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1. GENERAL
TION
QnA
1.3.3
What is bidirectional protocol?
"Bidirectional protocol" transmits arbitrary data agreed upon between sequence program and
external device.
The difference between non procedure protocol and bidirectional protocol is that bidirectional
protocol sends and receives data between PC CPU and external device while passing an End
of
Receive signal to the opposite device.
5
XXXX dat>
Sendlng
0 K!
I recelved it.
C
The following can be performed using the bidirectional protocol
PC CPU and external device interaction
Arbitrary data can be sent and received between sequence program and external device.
The opposite device can use the response message to check whether
or
not the data
was received correctly.
(Data transmission)
PC
(Data transmission)
PC
QnACPU module
QC24
The QC24 performs all response message processing.
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