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3.
PROCEDURE UP TO DATA COMMUNICATIONS DESCRIBED IN THIS
GUIDEBOOK
MELSEC QnA
3.5.2
Loopback test operation procedure
@
Connect the external device and QC24 in the regular configuration with a cable as
described in Section 3.3.
@
Set the QC24 front panel switches as shown in Section 3.1.2.
Set the mode switch to "1
'I.
@
Start the PC CPU.
When the QC24 NEU LED is turned
on, the loopback test can be executed.
(The NEU LED is turned ON several seconds after the PC CPU power is turned ON,
or the CPU is reset.)
@
Write the program shown in Section 3.5.1 to the external device. After writing, set the
external device to "RUN".
If there are no errors, the following prompt will appear on the external device screen.
Send data?
@ Input arbitrary data from the external device keyboard.
(For example,
[
~
[
~
l
[
~
~
~
~
]
)
@
The external device checks if the data it send and the data returned from the QC24 are
the same.
If the two data are the same, communications between the external device and QC24
are normal.
;end data?
ABCDE Send
data
ASCII code
Frame identification
ENQ
No. (F9)
Statlon
No.
(00)
Network
No.
(00)
PC NO.
(FO
Local station
No.
(00)
Command (0619)
Subcommand
(0000)
05
30
46
30
39
30
30 35
30
41
30
42
30
43
46
44
46
45
30
30
30
36
39
31
30
30
30
30
Receive data
ASCII code
STX
02
30
Loopback data
Frame Identification 46
30
count
(0005)
No. (F9)
[
39
30
30
35
Station
No.
(00)
[
30
41
Send data
Network
No.
(00)
(ABCDQ
PC No.
IFF)
[
46
44
46
45
Local statlon
No.
(00)
30
Loopback data
count (0005)
Send data
(ABCDE)
ED(
3etransmlt (Y/N) ?
3-11
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