Mitsubishi Electric MELSEC IQ-R series Reference Manual page 392

Communication example
Return 5-digit data received from an external device to the external device unchanged under the following conditions.
• Message wait: 0 ms
• Character length: 5 characters
• Loopback data: 'ABCDE'
(Request data)
Message wait
Character length
T T 0 0 5
54 54 30 30 35
H H H H H
(Response data)
Character length
Loopback data
0 5 A B C
41 42 43
30 35
H H H H H
17 COMMUNICATING USING 1C FRAMES
390
17.7 Loopback Test
Loopback data
A B C D E
41 42 43 44 45
H H H H H
D E
44 45
H H