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4.1
Dedicated Protocol Formats
The following shows the dedicated protocols that send and receive data between external device
and QC24.
Each frame can be chosen to match the data communications purpose and the specifications of
the external device.
0
<Data mode>
@ <Frame>
@
<Format>
Dedicated protocol
ASCII mode
A
compatible
frame
frame as computer l h nk function)
Format 1 -4....Refer to the Computer Llnk
Modul Guidebook.
QnA frame
Format
1-4
QnA
extension
frame
Format
1-4
Binary mode - QnA extension frame
Format
5
@
The QC24 can select the ASCII mode or binary mode.
The following shows ASCII mode and binary mode data communications examples.
ASCII mode
The QC24 converts the binary data sent from the PC CPU to ASCII data and stores the
ASCII data to the device memory.
The QC24 converts the ASCII data received from the external device to binary data and
stores the binary data to the device memory.
PC CPU
QC24
External device
(blnary
data)
,
,
ditai
,
0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0
BINttASCll converslon
1234H
-
-
131Hl32H133Hi34HI
Binary mode
The QC24 stores the data sent from the PC CPU to the device memory as is. It also stores
the binary data received from the external device to the device memory as is.
PC CPU
QC24
External device
iblnarv
datal
narv
data)
,
I
0 0 0 1 0 0 1 0 0 0 1 1 0 1 0 0
Not converted
r
l
@
Frames can be used according to the application.
Frame
cessed.
cessed.
the
same
device
range
as
QnACPU
All devices can be ac-
All devices can be ac-
Reading and writing over
Access to
QnA Extension Frame QnA Frame
A Compatible Frame
the AnUCPU is possible.
Features Same message
structure All the QC24 functions
All the QC24 functions
as MELSEC-A Series
can be used.
cess to other stations to
dedicated protocol. (The
Extends the range of ac-
Computer Link Module
can be used.
commands that can be
beyond that of the QnA
used are limited.)
frame.
4 - 2
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