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4
SETTINGS AND PROCEDURES PRIOR TO OPERATION
(Procedure 5) Ending the loopback test
TT (ACPU common command)
Header data sent
by the external device
E
(Data name)
N
External
Q
device side
H L
H L
0 0
F F T T
(Example)
05
30
30
46
46
H
H
H
H
(Data name)
Programmable
controller
CPU side
(Example)
4 - 32
Perform the following procedure according to the function used, and start data
communication.
• Set the switch settings with GX Developer according to the procedure specified in
Section 4.5.2.
• Turn on the power to the station on which the Q series C24 is installed.
An example of control procedure when the TT command is used in the loopback
test mentioned in Procedure 3.
(Station number: 00, sum check code: Yes)
Two characters (hexadecimal) ... Designate the number of characters (1 to 254) of return data to be
Designate with a text string consisting of "0" to "9" and "A" to "F" (capital letter)
Loopback data
data with the
length given
by Character
length
H L
0
0 5
A B C D E
54
54
30
30
35
41
42
43
44
45
H
H
H
H
H
H
H
H
H
H
H
Character A part
Becomes the
same data
Header data to be sent by
the programmable controller
sent immediately afterward.
(In case of format 1)
Sum check
code
Two characters (hexadecimal)
L
H
8
7
37
38
H
H
S
T
X
H L
H L
H L
0 5 A B C D E
0 0
F F
02
30
30
46
46
30
H
H
H
H
H
H
Character B part
E
Loopback data
Sum check
data with the
code
length given
T
by Character
length
X
L
H
3
A
35
41
42
43
44
45
03
41
33
H
H
H
H
H
H
H
H
MELSEC-Q
H
4 - 32
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